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18/12/2016

Fibrinogène dès que l'Hb baisse ?

Estimation of plasma fibrinogen levels based on hemoglobin, base excess and Injury Severity Score upon emergency room admission

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Il existe un grand débat sur la manière de prendre en charge la coagulopathie traumatique des traumatisés ballistiques en contexte d'isolement (1,2).Un des sujets porte sur la manière de corriger l'hypofibrinogénémie soit par apport de Plasma soit par apport de concentrés de fibrinogène (3, 4). Le consensus européen valide les deux approches (5). Mais dans notre contexte d'intervention quels critères d'administration appliquer ? L'hémoglobinémie à la prise en charge permettrait d'indiquer l'apport de fibrinogène, en gros dès qu'elle est abaissée et surtout <10g/dl. C'est ce que peut laisser penser cette étude. Des moyens simples utilisables en contexte d'isolement permettent donc de stratifier les indications de fibrinogène apporté soit sous forme concentré soit sous forme de plasma (6).

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INTRODUCTION:

Fibrinogen plays a key role in hemostasis and is the first coagulation factor to reach critical levels in massively bleeding trauma patients. Consequently, rapid estimation of plasma fibrinogen (FIB) is essential upon emergency room (ER) admission, but is not part of routine coagulation monitoring in many centers. We investigated the predictive ability of the laboratory parameters hemoglobin (Hb) and base excess (BE) upon admission, as well as the Injury Severity Score (ISS), to estimate FIB in major trauma patients.

METHODS:

In this retrospective study, major trauma patients (ISS ≥16) with documented FIB analysis upon ER admission were eligible for inclusion. FIB was correlated with Hb, BE and ISS, alone and in combination, using regression analysis.

RESULTS:

A total of 675 patients were enrolled (median ISS 27). FIB upon admission correlated strongly with Hb, BE and ISS.

 

FibriHb.jpg

Multiple regression analysis showed that Hb and BE together predicted FIB (adjusted R2 = 0.46; loge(FIB) = 3.567 + 0.223.Hb - 0.007.Hb2 + 0.044.BE), and predictive strength increased when ISS was included (adjusted R2 = 0.51; loge(FIB) = 4.188 + 0.243.Hb - 0.008.Hb2 + 0.036.BE - 0.031.ISS + 0.0003.ISS2). Of all major trauma patients admitted with Hb <12 g/dL, 74% had low (<200 mg/dL) FIB and 54% had critical (<150 mg/dL) FIB. Of patients admitted with Hb <10 g/dL, 89% had low FIB and 73% had critical FIB. These values increased to 93% and 89%, respectively, among patients with an admission Hb <8 g/dL. Sixty-six percent of patients with only a weakly negative BE (<-2 mmol/L) showed low FIB. Of patients with BE <-6 mmol/L upon admission, 81% had low FIB and 63% had critical FIB. The corresponding values for BE <-10 mmol/L were 89% and 78%, respectively.

CONCLUSIONS:

Upon ER admission, FIB of major trauma patients shows strong correlation with rapidly obtainable, routine laboratory parameters such as Hb and BE. These two parameters might provide an insightful and rapid tool to identify major trauma patients at risk of acquired hypofibrinogenemia. Early calculation of ISS could further increase the ability to predict FIB in these patients. We propose that FIB can be estimated during the initial phase of trauma care based on bedside tests.

15/12/2016

Sang total: Pas que chaud, de banque aussi

Coagulation function of stored whole blood is preserved for 14 days in austere conditions: A ROTEM feasibility study during a Norwegian antipiracy mission and comparison to equal ratio reconstituted blood.

 
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L'emploi du sang total fait un retour en force dans les stratégies transfusionnelles actuelles (1) bien sûr dans un contexte militaire mais aussi dans toutes les situations d'isolement comme les expéditions et le milieu maritime. (2). On pense alors sang frais. En fait la conservation à +4°c de ce sang en banque appropriée n'altère ni les fonctions plaquettaires ni la fonctionnalité du fibrinogène. Ces données permettent donc d'ouvrir la porte à la mise à disposition de ce type de produit en contexte militaire ou d'isolement ne permettant pas la conservation des produits sanguins dans les mêmes condition qu'une banque de sang hospitalière (3). On rappelle quand même que la conservation du sang total en banque de sang n'est pas franchement une nouveauté et que c'est sous cette forme qu'il est disponible dans nombre de pays.
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BACKGROUND:

Formulation of a medical preparedness plan for treating severely bleeding casualties during naval deployment is a significant challenge because of territory covered during most missions. The aim of this study was to evaluate the concept of "walking blood bank" as a supportable plan for supplying safe blood and blood products.

METHODS:

In 2013, the Royal Norwegian Navy conducted antipiracy operations from a frigate, beginning in the Gulf of Aden and ending in the Indian Ocean. Crews were on 24-hour emergency alert in preparation for an enemy assault on the frigate. Under an approved command protocol, a "walking blood bank," using crew blood donations, was established for use on board and on missions conducted in rigid-hulled inflatable boats, during which freeze-dried plasma and leukoreduced, group O low anti-A/anti-B titer, cold-stored whole blood were stored in Golden Hour Boxes. Data demonstrating the ability to collect, store, and provide whole blood were collected to establish feasibility of implementing a whole blood-focused remote damage-control resuscitation program aboard a naval vessel. In addition, ROTEM data were collected to demonstrate feasibility of performing this analysis on a large naval vessel and to also measure hemostatic efficacy of cold-stored leukoreduced whole blood (CWB) stored during a period of 14 days. ROTEM data on CWB was compared with reconstituted whole blood.

RESULTS:

Drills simulating massive transfusion activation were conducted, in which 2 U of warm fresh whole blood with platelet sparing leukoreduction were produced in 40 minutes, followed by collection of two additional units at 15-minute increments. The ROTEM machine performed well during ship-rolling, as shown by the overlapping calculated and measured mechanical piston movements measured by the ROTEM device. Error messages were recorded in 4 (1.5%) of 267 tests. CWB yielded reproducible ROTEM results demonstrating preserved fibrinogen function and platelet function for at least 3.5 weeks and 2 weeks, respectively. The frequency of ROTEM tests were as follows: EXTEM (n = 88), INTEM (n = 85), FIBTEM (n = 82), and APTEM (n = 12). CWB results were grouped. Compared with Days 0 to 2, EXTEM maximum clot firmness was significantly reduced, beginning on Days 10 to 14; however, results through that date remained within reference ranges and were comparable with the EXTEM maximum clot firmness for the reconstituted whole blood samples containing Day 5 room temperature-stored platelets.

CONCLUSION:

A "walking blood bank" can provide a balanced transfusion product to support damage-control resuscitation/remote damage-control resuscitation aboard a frigate in the absence of conventional blood bank products. ROTEM analysis is feasible to monitor damage-control resuscitation and blood product quality. ROTEM analysis was possible in challenging operational conditions.

14/12/2016

Fibrinogène: Moins de décès

Pre-emptive administration of fibrinogen concentrate contributes to improved prognosis in patients with severe trauma

Yamamoto K, et al. Trauma Surg Acute Care Open 2016;1:1–5

 

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Bien que cela reste encore discuté, l'apport précoce de fibrinogène améliorerait la survie des traumatisés sévères. Cette publication est du moins en faveur de cette hypothèse.

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Background

Patients with severe trauma often present with critical coagulopathy, resulting in impaired hemostasis, massive hemorrhage, and a poor survival prognosis. The efficacy of hemostatic resuscitation in correcting coagulopathy and restoring tissue perfusion has not been studied. We assessed a novel approach of pre-emptive administration of fibrinogen concentrate to improve critical coagulopathy in patients with severe trauma.

Methods

We retrospectively compared blood transfusion volumes and survival prognosis between three groups of patients with trauma, with an Injury Severity Score (ISS) ≥26 over three consecutive periods: group A, no administration of fibrinogen concentrate; group B, administration of 3 g of fibrinogen concentrate after evaluation of trauma severity and a plasma fibrinogen level ​<1.5 g/L; group C, pre-emptive administration of 3 g of fibrinogen concentrate immediately on patient arrival based on prehospital information, including high-severity injury or assessed
need for massive transfusion before measurement of fibrinogen.

Results

∼56% of patients with an ISS ≥26 and transfused with red blood cell concentrates ≥10 units, had hypofibrinogenemia (fibrinogen <1.5 g/L) on arrival. Patients who received fibrinogen concentrate in group C showed significantly higher fibrinogen levels after treatment with this agent than those in group B (2.41 g/L vs 1.88 g/L; p=0.01). Although no significant difference was observed in blood transfusion volumes between the groups, the 30-day survival of patients in group C (all, and those with an ISS ≥26) was significantly better than in group A ( p<0.05). The 48-hour mortality rate in patients with an ISS ≥26 was significantly lower in group C than in group A (8.6% vs 22.9%; p=0.005). Further, among patients with an ISS ≥41, the overall mortality was significantly lower in group C than in group A (20% vs 50%; p=0.02).
Conclusion

Pre-emptive administration of fibrinogen concentrate for patients with trauma with critical coagulopathy may contribute to improved survival.

 

 

| Tags : coagulopathie

11/12/2016

PEG-20k: Le graall du prolongef field care ?

Low-volume resuscitation using polyethylene glycol-20k in a preclinical porcine model of hemorrhagic shock

Plant V. et Al. J Trauma Acute Care Surg. 2016 Dec;81(6):1056-1062.

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Une nouvelle approche de la prise en compte des lésions induites par l'ischémie tissulaire qui est basée sur l'expérience de l'emploi des solutés utilisés pour conserver les organes en instance de transplantation. Grosso-modo: Remplir les espaces interstitiels par des solutés ne dépendant pas de mécanismes énergétiques. Une explication ici.

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INTRODUCTION:

Polyethylene glycol-20k (PEG-20k) is highly effective for low-volume resuscitation (LVR) by increasing tolerance to the low-volume state. In our rodent shock model, PEG-20k increased survival and expanded the "golden hour" 16-fold compared to saline. The molecular mechanism is largely attributed to normalizations in cell and tissue fluid shifts after low-flow ischemia resulting in efficient microvascular exchange. The objective of this study was to evaluate PEG-20k as an LVR solution for hemorrhagic shock in a preclinical model.

METHODS:

Anesthetized male Yorkshire pigs (30-40 kg) were hemorrhaged to a mean arterial pressure (MAP) of 35 to 40 mm Hg. Once lactate reached 7 mmol/L, either saline (n = 5) or 10% PEG-20k (n = 5) was rapidly infused at 10% calculated blood volume. The primary outcome was LVR time, defined by the time from LVR administration to the time when lactate again reached 7 mmol/L. Other outcomes measured included MAP, heart rate, cardiac output, mixed venous oxygen saturation, splanchnic blood flow, and hemoglobin.

RESULTS:

Relative to saline, PEG-20k given after controlled hemorrhage increased LVR time by 16-fold, a conservative estimate given that the lactate never rose after LVR in the PEG-20k group. Survival was 80% for PEG-20k LVR compared to 0% for the saline controls (p < 0.05).

PEG 20k.jpg

Polyethylene glycol-20k also significantly decreased heart rate after hemorrhage and increased cardiac output, MAP, splanchnic flow, and mixed venous oxygen saturation. Falling hemoglobin concentrations suggested sizable hemodilution from fluid shifts into the intravascular compartment.

CONCLUSIONS:

In a preclinical model of controlled hemorrhagic shock, PEG-20k-based LVR solution increased tolerance to the shock state 16-fold compared to saline. Polyethylene glycol-20k is a superior crystalloid for LVR that may increase safe transport times in the prehospital setting and find use in hospital emergency departments and operating rooms for patients awaiting volume replacement or normalization of cell, tissue, and compartment fluid volumes.

NaCl 7,5% ? A voir mais sans Colloïdes.

Pre-Hospital Resuscitation of Traumatic Hemorrhagic Shock with Hypertonic Solutions Worsen Hypo-Coagulation and Hyper-Fibrinolysis

Delano M. et Al. Shock. 2015 Jul;44(1):25-31

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Le choix d'un liquide de remplissage vasculaire n'est pas simple. Au delà des contraintes d'efficacité en termes de remplissage vasculaire, de bonne tolérance notamment rénale il y a également les effets de ce dernier sur la coagulation. On sait qu'une partie importante des blessés actuellement pris en charge présentent une coagulopathie traumatique (1). Le NaCl 7.5% est le soluté recommandé par la procédure du sauvetage au combat (2) car il représente le meilleur compromis intérêt médical/logistique. Le travail ici présenté met en évidence les effets délétères des solutés hypertoniques sur la coagulation. Ce document mérite cependant d'être pondéré car il s'appuie sur une petite cohorte de patients de traumatologie civile, que le profil du remplissage vasculaire préhospitalier n'est pas clairement rapporté hormis le premier liquide, qu'il ne précise pas le niveau de calcémie plasmatique car ce dernier peut être affecté selon la nature des solutés utilisés (4), que le groupe HS a des marqueurs d'hypoperfusion tissulaire identique au groupe NS, que la comparaison se fait avec un groupe de sujets sains et non entre les groupes. Par ailleurs on sait également qu'il est mis en avant l'intérêt des solutions HS en matière de prise en charge des HTIC des plaies cranio-cérébrales (4) et la réduction de l'activation des polynucléaires neutrophiles (5). Donc il ne s'agit pas de remettre en question le choix actuel, mais de le repositionner dans le débat notamment avec l'emploi du Plama lyophylisé comme soluté de remplissage premier des blessés les plus graves (6). Une chose apparait certaine: Ne plus utiliser une association HS/Dextran type RescueFlow (7).

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Impaired hemostasis frequently occurs after traumatic shock and resuscitation. The prehospital fluid administered can exacerbate subsequent bleeding and coagulopathy. Hypertonic solutions are recommended as first-line treatment of traumatic shock; however, their effects on coagulation are unclear. This study explores the impact of resuscitation with various hypertonic solutions on early coagulopathy after trauma. We conducted a prospective observational subgroup analysis of large clinical trial on out-of-hospital single-bolus (250 mL) hypertonic fluid resuscitation of hemorrhagic shock trauma patients (systolic blood pressure, e70 mmHg). Patients received 7.5% NaCl (HS), 7.5% NaCl/6% Dextran 70 (HSD), or 0.9% NaCl (normal saline [NS]) in the prehospital setting. Thirty-four patients were included: 9 HS, 8 HSD, 17 NS. Treatment with HS/HSD led to higher admission systolic blood pressure, sodium, chloride, and osmolarity, whereas lactate, base deficit, fluid requirement, and hemoglobin levels were similar in all groups. The HSD-resuscitated patients had higher admission international normalized ratio values and more hypocoagulable patients, 62% (vs. 55% HS, 47% NS; P G 0.05). Prothrombotic tissue factor was elevated in shock treated with NS but depressed in both HS and HSD groups. Fibrinolytic tissue plasminogen activator and antiYfibrinolytic plasminogen activator inhibitor type 1 were increased by shock but not thrombin-activatable fibrinolysis inhibitor. The HSD patients had the worst imbalance between procoagulation/anticoagulation and profibrinolysis/antifibrinolysis, resulting in more hypocoagulability and hyperfibrinolysis. We concluded that resuscitation with hypertonic solutions, particularly HSD, worsens hypocoagulability and hyperfibrinolysis after hemorrhagic shock in trauma through imbalances in both procoagulants and anticoagulants and both profibrinolytic and antifibrinolytic activities

25/08/2016

Réchauffer une perfusion: La tubulure +++

An Analysis of the Temperature Change in Warmed Intravenous Fluids during Administration in a Cold Environment at Temperatures of Less than 0

2016 Critical Care Transport Medicine Conference Scientific Forum

SIngleton W et Al. Air Medical Journal 35 (2016) 205-207

 

Objective: This is a non-human simulation study determining the decrease in temperature that occurred to 1L bags of Normal Saline in an austere environment. The bags were warmed to 38°C (100°F), administered through standard intravenous tubing at a set flow rate, while in an environment with ambient temperatures of less than 0°C (32°F). The goal was to determine if there was a significant decrease in fluid temperature from the IV bag through the tubing to the IV catheter administration site.

Methods/Materials: Three trials were run at four different temperatures, 0°C (32°F), -7 °C (20°F), -12°C (10°F ) and 33°C (72°F control ). Each bag of normal saline was warmed to the same temperature 38°C (100°F) utilizing the Soft Sack IV Fluid Warmer. Three of the bags were then placed in a cold austere environment (freezer) at each of the specified temperatures. The remaining bag was kept in the ambient temperature 33°C (72°F control). The fluid was administered through standard intravenous tubing (18 gauge catheter, 20 drop set, 211 cm in length) at a flow rate of 999ml/hr in temperatures less than 0°C (32°F). Fluid was collected in a glass container outside the austere environment with the temperature being recorded at 5 minute intervals.

Results: The results demonstrated a statistically significant (p> 0.05) change in temperature between the IV bag and the administration site. The most rapid change occurred within the first 5 minutes. The temperature change was more significant with the colder ambient temperatures, with an average of 50° difference at -7°C (20°F) and -12°C (10°F ). This is compared to a 27° difference at 0°C and the control temperature of 33°C (72°F control). The temperature of the fluid remaining within the IV bag also decreased an average of 15°C at the control temperature of 33°C (72°F control) and 0°C (32°F), which is statistically significant. The temperature in the bag decreased an average of 35°C at -7°C (20°F) and -12°C (10°F), which was statistically significant (p>0.05).

Conclusion: Based on these results, it appears that the most significant heat loss occurs through the IV tubing itself, the loss occurs rapidly, and is more pronounced at colder ambient air temperatures. Therefore, it may be beneficial to insulate the tubing on a trauma patient receiving warmed IV fluids in a cold environment of less than 0°C (32°F) to help prevent hypothermia.

01/05/2016

Albumine aussi bien que PFC ?

Influences of Limited Resuscitation with Plasma or Plasma Protein Solutions on Hemostasis and Survival of Rabbits with Non-Compressible Hemorrhage

J Trauma Acute Care Surg. 2016 Apr 27. Kheirabadi BS et Al.

 

BACKGROUND:

Plasma infusion with or without RBC is the current military standard of care for prehospital resuscitation of combat casualties. We examined possible advantages of early and limited resuscitation with fresh plasma compared with a single plasma protein or crystalloid solutions in an uncontrolled hemorrhage model in rabbits.

METHODS:

Anesthetized spontaneously breathing rabbits (3.3±0.1 kg) were instrumented and subjected to a splenic uncontrolled hemorrhage. Rabbits in shock were resuscitated at 15 min with Plasma-Lyte (PAL; 30 ml/kg), PAL+ fibrinogen (PAL+F; 30ml+100mg/kg), fresh rabbit plasma (PLS; 15ml/kg), or 25% albumin (ALB; 5 ml/kg) solution; all given in two bolus IV injections (15 min apart) to achieve a MAP of 65 mmHg, n=8-9/group. Animals were monitored for 2 hrs or until death and blood loss was measured. Blood samples and tissues were collected and analyzed.

RESULTS:

There were no differences among groups in baseline measures and their initial bleeding volume at 15 min. At 60 min post-injury, MAP was higher with albumin than with crystalloids (PAL or PAL+F), but shock indices were not different despite the large differences in resuscitation volumes.

AlbVSPlasma.jpg

Fibrinogen addition to PAL only increased clot strength. Plasma resuscitation increased survival rate (75%) without significant improvement in coagulation measures. Albumin administration replenished total plasma protein, and increased survival rate to 100% (p<.05 vs. crystalloids). No histological adverse events were identified in the vital organs.

CONCLUSION:

Fibrinogen administration added to a compatible crystalloid did not improve hemostatic outcomes. Plasma resuscitation increased survival rate, however, its effects did not differ from those obtained with 25% albumin at 1/3 of the volume. The albumin advantage was consistent with our previous findings in which 5% albumin was used at a volume equal to plasma. The benefit of plasma for resuscitation may be mostly due to its albumin content rather than its coagulation proteins

 

| Tags : remplissage

09/01/2016

HES et hémorragie: Pas bon ménage ?

Effects of different types of fluid resuscitation for hemorrhagic shock on splanchnic organ microcirculation and renal reactive oxygen species formation

Wu et al. Critical Care (2015) 19:434

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Un travail de plus qui doit rendre raisonné sur l'emploi des colloïdes synthétiques qui si ils semblent préserver la circulation splanchnique seraient responsables de lésions oxydatives secondaires. CEla serait moins le cas avce le salé hypertonique.

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Introduction: Fluid resuscitation is an indispensable procedure in the acute management of hemorrhagic shock for restoring tissue perfusion, particularly microcirculation in splanchnic organs. Resuscitation fluids include crystalloids, hypertonic saline (HTS), and synthetic colloids, and their selection affects the recovery of microcirculatory blood flow and reactive oxygen species (ROS) formation, which is often evident in the kidney, following reperfusion. In this study, the effects of acute resuscitation with 0.9 % saline (NS), 3 % HTS, 4 % succinylated gelatin (GEL), and 6 % hydroxyethyl starch (HES) 130/0.4 were compared in a hemorrhagic shock rat model to analyze restoration of microcirculation among various splanchnic organs and the gracilis muscle and reperfusion-induced renal ROS formation.

Methods: A total of 96 male Wistar rats were subjected to sham operation (sham group), hemorrhagic shock (control group), and resuscitation with NS, HTS, GEL and HES. Two hours after resuscitation, changes in the mean arterial pressure (MAP), serum lactate level and the microcirculatory blood flow among various splanchnic organs, namely the liver, kidney, and intestine (mucosa, serosal muscular layer, and Peyer’s patch), and the gracilis muscle, were compared using laser speckle contrast imaging. Renal ROS formation after reperfusion was investigated using an enhanced in vivo chemiluminescence (CL) method.

Results: Microcirculatory blood flow was less severely affected by hemorrhaging in the liver and gracilis muscle. Impairment of microcirculation in the kidney was restored in all resuscitation groups. Resuscitation in the NS group failed to restore intestinal microcirculation. Resuscitation in the HTS, GEL, and HES groups restored intestinal microcirculatory blood flow. By comparison, fluid resuscitation restored hemorrhagic shock-induced hypotension and decreased lactatemia in all resuscitation groups. Reperfusion-induced in vivo renal ROS formation was significantly higher in the GEL and HES groups than in the other groups.

Conclusion: Although fluid resuscitation with NS restored the MAP and decreased lactatemia following hemorrhagic shock, intestinal microcirculation was restored only by other volume expanders, namely 3 % HTS, GEL, and HES. However, reperfusion-induced renal ROS formation was significantly higher when synthetic colloids were used.

| Tags : remplissage

19/11/2015

Stratégie Low Flow: Encore confirmée

Efficacy of limited fluid resuscitation in patients with hemorrhagic shock: a meta-analysis

Duan C. et Al. Int J Clin Exp Med. 2015; 8(7): 11645–11656.

ijcem0008-11645-f2.jpg

12/11/2015

Et l'albumine ?

Is limited prehospital resuscitation with plasma more beneficial than using a synthetic colloid? An experimental study in rabbits with parenchymal bleeding

Kheirabadi BS et Al. J Trauma Acute Care Surg. 2015;78: 752-759

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Il existe de grands débats sur la manière optimale d'assurer le remplissage vasculaire des blessés de guerre. Pour certains le fluide de référence est un hydroxyéthylamidon, pour d'autres un cristalloïde isotonique et en ce qui nous concerne les deux avec la mise en avant du sérum salé hypertonique premier suivi d'HEA. Actuellement il existe une tendance à promouvoir une autre stratégie faisant appel pour les blessés les plus graves au plasma voire la transfusion de sang frais. L'étude proposée avait pour objectif de confirmer l'intérêt d'une démarche "plasma premier". Une des surprises a été de constater que ce n'est pas cette dernière qui permettait d'obtenir le meilleur taux de survie mais l'emploi d'albumine, et ce de loin. Ces données expérimentales certes très partielles permettent aux auteurs (?)  de rediscuter les conclusions de travaux anciens notamment de l'étude SAFE (1,2). Les solutés d'albumine utilisés par cette dernière ont une osmolarité de 260 mosm/kg (versus 305 mosm/kg pour le sérum salé). Les effets délétères notamment chez le traumatisé crânien pourraient être dus non pas à  l'extravasation d'albumine dans le parenchyme cérébral lésé mais à l'hypoosmolarité de l'albumex 4%, ces deux mécanismes concourrant à la plus grande fréquence d'HTIC dans le groupe albumine (3).  A méditer

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BACKGROUND:

Reports of survival benefits of early transfusion of plasma with red blood cells (1:1 ratio) in trauma patients suggest that plasma may be a better fluid to replace Hextend for battlefield resuscitation. We studied possible advantages of prehospital resuscitation with plasma compared with Hextend or albumin in a model of uncontrolled hemorrhage.


METHODS:

Male New Zealand white rabbits (3.3 T 0.1 kg) were anesthetized, instrumented, and subjected to a splenic injury with uncontrolled bleeding. Ten minutes after injury (mean arterial pressure [MAP] G 40 mm Hg), the rabbits received small and equal volumes (15 mL/kg) of rabbit plasma (n = 10), Hextend (n = 10), or 5% human albumin (n = 9) or no fluid. Fluids were administered in two bolus injections (20 minutes apart) and targeted to aMAP of 65 mm Hg. Animals were monitored for 2.5 hours or until death, and their blood losses were measured. Arterial blood samples were collected at different times and analyzed for ABG, CBC, and coagulation tests.

RESULTS:

There were no differences in baseline measures among groups. Splenic injury caused similar hemorrhages (9.1 T 0.4 mL/kg at 10 minutes) and decreased MAP in all subjects. Subsequent resuscitation initiated additional bleeding. At 60 minutes after injury (20 minutes after resuscitation), longer activated partial thromboplastin time and lower fibrinogen concentrations were apparent compared with baseline values with differences among groups. Thrombelastography analysis indicated faster and stronger clot formation with plasma and albumin resuscitation than with Hextend use. Shock indices were increased in all groups, but smaller changes were measured in the albumin group. Total blood loss did not differ among resuscitated rabbits but was higher (p G 0.05) than among nonresuscitated animals. Survival rates were 11% (untreated), 40% (Hextend and plasma), and 89% (albumin, p G 0.05).

Albuminie COT.jpg

CONCLUSION:

Resuscitation with plasma or albumin better preserved coagulation function than did Hextend. However, despite these improvements, plasma resuscitation did not reduce blood loss or improve survival, while albumin administration seemed beneficial

Lent/régulier: Mieux pour le crâne ?

Resuscitation speed affects brain injury in a large animal model of traumatic brain injury and shock

Sillesen M et Al. Scand J Trauma Resusc Emerg Med. 2014 Aug 14;22:46

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En matière de remplissage vasculaire,  on s'intéresse souvent à la nature des solutés et aux quantités perfusées. On s'intéresse moins aux vitesses de perfusion. Pourtant cette dernière a son importance. Le travail présenté est intéressant car il rapport qu'outre la nature du soluté importante mais aussi sa vitesse d'administration. Ainsi il semblerait que dans un modèle expérimental de traumatisme crânien l'emploi de solutés cristalloïdes de sérum salé isotonique soit responsable d'une augmentation de l'oedeme cérébal et du volume des lésions intracraniennes quel que soit le régime d'administration. Ce travail retrouve par ailleurs l'intérêt sur la maîtrise de l'oedeème cérébral  de l'apport de fraction coagulantes de manière procédurée par rapport au bolus. Si l'on replace ce document dans le contexte d'isolement et de maintien en survie de nos blessés notamment cranio-cérébraux en état de choc, cela implique une formation spécifique des équipes qui devront par ailleurs pouvoir disposer d'équipements adaptés comme celui_ci (1)

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BACKGROUND:

Optimal fluid resuscitation strategy following combined traumatic brain injury (TBI) and hemorrhagic shock (HS) remain controversial and the effect of resuscitation infusion speed on outcome is not well known. We have previously reported that bolus infusion of fresh frozen plasma (FFP) protects the brain compared with bolus infusion of 0.9% normal saline (NS). We now hypothesize reducing resuscitationinfusion speed through a stepwise infusion speed increment protocol using either FFP or NS would provide neuroprotection compared with a highspeed resuscitation protocol.

METHODS:

23 Yorkshire swine underwent a protocol of computer controlled TBI and 40% hemorrhage. Animals were left in shock (mean arterial pressure of 35 mmHg) for two hours prior to resuscitation with bolus FFP (n = 5, 50 ml/min) or stepwise infusion speed increment FFP (n = 6), bolus NS (n = 5, 165 ml/min) or stepwise infusion speed increment NS (n = 7). Hemodynamic variables over a 6-hour observation phase were recorded. Following euthanasia, brains were harvested and lesion size as well as brain swelling was measured.

RESULTS:

Bolus FFP resuscitation resulted in greater brain swelling (22.36 ± 1.03% vs. 15.58 ± 2.52%, p = 0.04), but similar lesion size compared with stepwise resuscitation. This was associated with a lower cardiac output (CO: 4.81 ± 1.50 l/min vs. 5.45 ± 1.14 l/min, p = 0.03). In the NS groups, bolus infusion resulted in both increased brain swelling (37.24 ± 1.63% vs. 26.74 ± 1.33%, p = 0.05) as well as lesion size (3285.44 ± 130.81 mm(3) vs. 2509.41 ± 297.44 mm3, p = 0.04). This was also associated with decreased cardiac output (NS: 4.37 ± 0.12 l/min vs. 6.35 ± 0.10 l/min, p < 0.01).

CONCLUSIONS:

In this clinically relevant model of combined TBI and HS, stepwise resuscitation protected the brain compared with bolusresuscitation.

s13049-014-0046-2-4.jpg

 

| Tags : tbi, remplissage

03/07/2015

Fibrinogène avec le TXA ?: Plutôt oui

Association of Cryoprecipitate and Tranexamic Acid With Improved Survival Following Wartime Injury: Findings From the MATTERs II Study

Morrison JJ et Al. JAMA Surg. 2013;148(3):218-225.

 

Objective To quantify the impact of fibrinogen-containing cryoprecipitate in addition to the antifibrinolytic tranexamic acid on survival in combat injured.

Design Retrospective observational study comparing the mortality of 4 groups: tranexamic acid only, cryoprecipitate only, tranexamic acid and cryoprecipitate, and neither tranexamic acid nor cryoprecipitate. To balance comparisons, propensity scores were developed and added as covariates to logistic regression models predicting mortality.

Setting A Role 3 Combat Surgical Hospital in southern Afghanistan.

Patients A total of 1332 patients were identified from prospectively collected UK and US trauma registries who required 1 U or more of packed red blood cells and composed the following groups: tranexamic acid (n = 148), cryoprecipitate (n = 168), tranexamic acid/cryoprecipitate (n = 258), and no tranexamic acid/cryoprecipitate (n = 758).

Main Outcome Measure In-hospital mortality.

Results Injury Severity Scores were highest in the cryoprecipitate (mean [SD], 28.3 [15.7]) and tranexamic acid/cryoprecipitate (mean [SD], 26 [14.9]) groups compared with the tranexamic acid (mean [SD], 23.0 [19.2]) and no tranexamic acid/cryoprecipitate (mean [SD], 21.2 [18.5]) (P < .001) groups. Despite greater Injury Severity Scores and packed red blood cell requirements, mortality was lowest in the tranexamic acid/cryoprecipitate (11.6%) and tranexamic acid (18.2%) groups compared with the cryoprecipitate (21.4%) and no tranexamic acid/cryoprecipitate (23.6%) groups. Tranexamic acid and cryoprecipitate were independently associated with a similarly reduced mortality (odds ratio, 0.61; 95% CI, 0.42-0.89; P = .01 and odds ratio, 0.61; 95% CI, 0.40-0.94; P = .02, respectively). The combined tranexamic acid and cryoprecipitate effect vs neither in a synergy model had an odds ratio of 0.34 (95% CI, 0.20-0.58; P < .001), reflecting nonsignificant interaction (P = .21).

Conclusions Cryoprecipitate may independently add to the survival benefit of tranexamic acid in the seriously injured requiring transfusion. Additional study is necessary to define the role of fibrinogen in resuscitation from hemorrhagic shock.

 

| Tags : coagulopathie

27/03/2015

Hypersalé: Mieux avec de la lidocaïne , du magnésium et de l'adénosine ?

Correction of acute traumatic coagulopathy with small-volume 7.5% NaCl adenosine, lidocaine, and Mg2+ occurs within 5 minutes: A ROTEM analysis

Hayley L. et Al. J Trauma Acute Care Surg. 2015;78: 773-783

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La prévention/correction de la coagulopathie traumatique est un axe essentiel de la réanimation du traumatisé grave. Le choix du soluté a son importance. L'adjonction de lidocaïne, de magnésium et d'adénosine au NaCl7,5% serait bénéfique. On observerait une fibrinolyse beaucoup moins importante qu'avec le salé hypertonique seul.

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BACKGROUND: Acute traumatic coagulopathy is a major contributor to mortality and morbidity following hemorrhagic shock. Our aim was to examine the effect of small-volume 7.5% NaCl with adenosine, lidocaine, and Mg2+ (ALM) resuscitation on the timing of correction of coagulopathy in the rat model of severe hemorrhagic shock using ROTEM.

METHODS: Male rats (300Y450 g, n = 64) were randomly assigned to (1) baseline, (2) sham, (3) bleed, (4) shock, (5) 7.5% NaCl for 5 minutes, (6) 7.5% NaCl with ALM for 5 minutes, (7) 7.5% NaCl for 60 minutes, or (8) 7.5% NaCl with ALM for 60 minutes (all n = 8). For resuscitation, 0.3-mL intravenous bolus of 7.5% NaCl was administered with and without ALM (n = 8 each group). Hemodynamics and coagulopathy were assessed.

RESULTS: After hemorrhage, prothrombin time (PT) and activated partial thromboplastin time (aPTT) increased approximately four to six times, and ROTEM indicated hypocoagulopathy. After 60-minute shock, no sustainable clots could form. 7.5% NaCl increased mean arterial pressure (MAP) to 46 T 2 mm Hg at 5 minutes and generated a weak clot in EXTEM with hyperfibrinolysis in all tests. At 60 minutes, 7.5% NaCl failed to sustain MAP (43 T 5 mm Hg) and generate a viable clot. In direct contrast, 7.5% NaCl with ALM at 5 minutes resuscitatedMAP to 64 T 3 mm Hg, corrected PT and aPTT, and generated fully formed EXTEM and FIBTEM clots. At 60 minutes, MAP was 69 T 5 mm Hg, PT and aPTT were fully corrected, and > angle, clot amplitudes (A10, A30), as well as clot firmness and elasticity were not significantly different from baseline. ALM clot lysis at 60 minutes was significantly less than bleed, shock, or 7.5% NaCl, indicating protection against hyperfibrinolysis.

 

Soluté Miracle.jpg

CONCLUSION: Small-volume 7.5% NaCl failed to resuscitate and correct coagulopathy. In contrast, 7.5% NaCl with ALM resuscitated MAP and corrected coagulopathy at 5 minutes, with further improvements at 60 minutes in clot kinetics, propagation, and firmness. ALM fully reversed hyperfibrinolysis to baseline. The possible mechanisms are discussed. (J Trauma Acute Care Surg. 2015;78:

Salé, HEA, Plasma ou albumine ?

Is limited prehospital resuscitation with plasma more beneficial than using a synthetic colloid? An experimental study in rabbits with parenchymal bleeding 

Kheirabadi BS et Al. J Trauma Acute Care Surg. 2015;78: 752-759

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La recherche de la meilleure stratégie de remplissage vasculaire pour la prise en charge d'un traumatisé sévère relève de la quête du saint-Graal. L'article proposé rapporte un travail expérimental qui semble trouver in intérêt réel à l'emploi d'albumine 4%.

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BACKGROUND:
Reports of survival benefits of early transfusion of plasma with red blood cells (1:1 ratio) in trauma patients suggest that plasma may be a better fluid to replace Hextend for battlefield resuscitation. We studied possible advantages of prehospital resuscitation with plasma compared with Hextend or albumin in a model of uncontrolled hemorrhage.
 
METHODS:
Male New Zealand white rabbits (3.3 T 0.1 kg) were anesthetized, instrumented, and subjected to a splenic injury with uncontrolled bleeding. Ten minutes after injury (mean arterial pressure [MAP] G 40 mm Hg), the rabbits received small and equal volumes (15 mL/kg) of rabbit plasma (n = 10), Hextend (n = 10), or 5% human albumin (n = 9) or no fluid. Fluids were administered in two bolus injections (20 minutes apart) and targeted to aMAP of 65 mm Hg. Animals were monitored for 2.5 hours or until death, and their blood losses were measured. Arterial blood samples were collected at different times and analyzed for ABG, CBC, and coagulation tests.
 
RESULTS:
There were no differences in baseline measures among groups. Splenic injury caused similar hemorrhages (9.1 T 0.4 mL/kg at 10 minutes) and decreased MAP in all subjects. Subsequent resuscitation initiated additional bleeding. At 60 minutes after injury (20 minutes after resuscitation), longer activated partial thromboplastin time and lower fibrinogen concentrations were apparent compared with baseline values with differences among groups. Thrombelastography analysis indicated faster and stronger clot formation with plasma and albumin resuscitation than with Hextend use. Shock indices were increased in all groups, but smaller changes were measured in the albumin group. Total blood loss did not differ among resuscitated rabbits but was higher (p G 0.05) than among nonresuscitated animals. Survival rates were 11% (untreated), 40% (Hextend and plasma), and 89% (albumin, p G 0.05).
 

AlbuPreH.jpg

 CONCLUSION:

Resuscitation with plasma or albumin better preserved coagulation function than did Hextend. However, despite these improvements, plasma resuscitation did not reduce blood loss or improve survival, while albumin administration seemed beneficial

 

| Tags : remplissage

31/01/2015

Cristalloïde/Colloïde ration; Plutôt 1,5 que 4

Crystalloids Versus Colloids: Exploring Differences in Fluid Requirements by Systematic Review and Meta-Regression

Orbegozo Cortés D. et Al. Anesth Analg 2015;120:389–402

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Le débat qui porte sur l'efficacité comparée des solutés de remplissage n'est pas nouveau. Cette méta-analyse porte sur l'analyse de 27 publications sélectionnées parmi 978. Elle met en évidence la très grande hétérogénéité des données publiées. Les raisons avancées portent sur la nature des populations étudiées (fuite capillaire très variable), l'administration préhospitalière de fluides à des volumes mal connu ce qui va compliquer l'analyse ultérieure, les différences de pharmacodynamie et cintétique des différents solutés employés, le fait que pour un même soluté l'efficacité en terme de remplissage puisse varier en fonction du moment de son administration, Qui qu'il en soit il semble que le ratio actuel soit plus proche de 1,5 que de 4.

On rappelle que la procédure du sauvetage au combat met en avant l'emploi de soluté salé hypertonique en première intention (250 ml en 10 minutes) suivi de 500ml de colloïdes (à défaut 250 ml de salé hypertonique) en cas de non restauration du pouls radial. Ce choix est résulte d'un compromis dans lequel le poids des solutés est pris en compte.

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BACKGROUND:

Positive fluid balance has been associated with worse outcomes, and knowledge of differences in the amounts of different types of fluid needed to achieve the same end points may have important clinical implications. Large molecules persist longer in the blood vessels than smaller molecules, such that less IV colloid may be needed to achieve similar hemodynamic end points compared with crystalloid. Recent clinical data have, however, challenged this physiological concept, with investigators reporting lower-than-expected crystalloid/colloid ratios in various populations.

METHODS:

We performed a systematic search in MEDLINE, EMBASE, and CENTRAL up to December 18, 2013, to retrieve all studies comparing (any) crystalloid with (any) colloid in all types of patients. The crystalloid/colloid ratio was calculated for each study. Descriptive analysis was performed for all studies, and a meta-analysis was performed in those studies reporting full data (in terms of means and standard deviations) of infused fluid volumes. Studies were grouped according to study and population characteristics. A meta-regression analysis was then performed to evaluate some of the possible reasons for differences in crystalloid/colloid ratios across studies.

RESULTS:

From 976 studies, 48 were retained for the final analysis; 24 of the studies had sufficient data for meta-analysis. The crystalloid/colloid ratio across all the studies included in the meta-analysis was 1.5 (95% confidence interval, 1.36–1.65) with marked heterogeneity among studies (I2 = 94%). From the meta-regression analysis, decade of publication across all publications (P = 0.001) and concentration (tonicity) in the subgroup of albumin studies (P = 0.001) were associated with the administered crystalloid/colloid ratio. The reduction in heterogeneity among studies for all publications in the meta-regression was minimal, with the maximal decrease obtained when decade of publication was considered (R2 = 12%).

 

ColloidCristalRatio.jpg

CONCLUSIONS:

Greater fluid volumes are required to meet the same targets with crystalloids than with colloids, with an estimated ratio of 1.5 (1.36–1.65), but there is marked heterogeneity among studies. The crystalloid/colloid ratio seems to have decreased over the years, and differences in ratios are correlated with the concentration of albumin solutions; however, the main reasons behind the high heterogeneity among studies remain unclear.

31/10/2014

HES: Du côté des belges

Hydroxyethyl Starches in the Perioperative Period. A review on the efficacy and safety of starch solutions

Ghuselings I et All. Acta Anaesth. Belg., 2014, 65, 9-22

Several randomized controlled trials have raised alarming concerns about the safety of hydroxyethyl starches (HES) for the hemodynamic stabilization of critically ill patients. It has been repeatedly demonstrated that the use of HES in patients treated in an intensive care unit was associated with an increased occurrence of serious adverse events, including a higher incidence of renal injury or failure, a higher need for renal replacement therapy (RRT), and (in one study) increased mortality. HES solutions are also widely used in the perioperative period, although high-level evidence on both the efficacy and safety of HES in patients undergoing surgery is sparse. It is unknown to which extent the concerning findings in critically ill patients can be extrapolated to the perioperative setting, where a variety of distinct patient populations is encountered. However, caution and an increased awareness for possible adverse effects of HES solutions in the perioperative setting are warranted. In 2013, the European Medicines Agency (EMA) concluded that the benefits of HES solutions no longer outweigh their risks, and therefore recommended that the marketing authorizations for these medicines be suspended (1). Upon request of some of the marketingauthorization holders (MAH), the EMA re-analyzed its recommendation. After a thorough review of the available data, the Pharmacovigilance Risk Assessment Committee (PRAC) concluded, on November 11th, that the increased risk of mortality and RRT or renal failure associated with the use of hydroxyethyl starch containing medicinal products outweighs their limited clinical benefits in the approved indications, and in any patient population. In June 2013, the U.S. Food and Drug Administration also communicated a serious warning with respect to the use of HES (2). The present (non-systematic) review summarizes the evidence upon which these remarkable recommendations are based. Moreover, current guidelines on the use of HES are quoted.

HES.jpg

14/09/2014

HEA: Peut être un peu de sérénité ?

Hydroxyethyl Starches: A Tale of Two Contexts: The Problem of Knowledge

Weiskopf R. Anesth Analg. 2014 Sep;119(3):509-13.

Un débat moins passionné est en train de se mettre en place au sujet de la toxicité des HES. Le texte proposé en est un exemple. Il propose une relecture pertinente des études 6S, CHEST et surtout CRISTAL qui d'une certaine façon remet en question les deux précédentes. Il nous demande de prendre en compte plusieurs éléments : La diversité des HES, les différences qui peuvent exister entre une administration répétée en réanimation et une administration ponctuelle péri-opératoire. Il s'appuie sur deux écrits publiés dans le même numéro.

Raghunathan K et all. (Intravenous Starches: Is Suspension the Best Solution?) suggèrent que les solutions colloïdes sont à réserver pour les hypovolémies aiguës alors que Irwin et all. (Volume Therapy with Hydroxyethyl Starches: Are We Throwing the Anesthesia Baby Out with the Intensive Care Unit Bathwater?) estiment que le recours aux HES 130/0.4 est pleinement justifié en environnement périopératoire

Cette démarche correspond au positionnement de la SFAR. Rappelons que la position actuelle des instances européennes est la suivante:

"  Les solutions à base d’HEA peuvent être utilisées pour la réanimation des patients avec une hypovolémie causée par une perte aiguë de sang, quand les alternatives comme la perfusion de cristalloïdes seuls sont insuffisantes. Afin de limiter les risques potentiels, les solutions contenant des HEA ne devront pas être utilisées plus de 24 heures et la fonction rénale devra être monitorée après administration des HEA "

 

| Tags : remplissage

04/09/2014

Remplissage vasculaire: Evolution majeure du TCCC

Fluid Resuscitation for Hemorrhagic Shock in Tactical Combat Casualty Care
 

L'emploi préhospitalier de la transfusion de globules rouges et de plasma était évoqué de manière anecdotique. Une évolution importante survient dans la procédure américaine du TCCC (1, 2). Cette pratique est en passe de devenir une recommandation protocolée de théâtre pour les blessés en état de choc (Pas de pouls radial et conscience altérée el l'absence de traumatisme crânien)  hémorragique avec notons le recours au Plyo du CTSA.

" Tactical Field Care and TACEVAC Care

7. Fluid resuscitation

a. The resuscitation fluids of choice for casualties in hemorrhagic shock, listed from most to least preferred, are: whole blood*; plasma, RBCs and platelets in 1:1:1 ratio*; plasma and RBCs in 1:1 ratio; plasma or RBCs alone; Hextend; and crystalloid (Lactated Ringers or Plasma-Lyte A).

b. Assess for hemorrhagic shock (altered mental status in the absence of brain injury and/or weak or absent radial pulse).

1. If not in shock:

- No IV fluids are immediately necessary.

- Fluids by mouth are permissible if the casualty is conscious and can swallow.

2. If in shock and blood products are available under an approved command or theater blood product administration protocol:

- Resuscitate with whole blood*, or, if not available

- Plasma, RBCs and platelets in a 1:1:1 ratio*, or, if not available

- Plasma and RBCs in 1:1 ratio, or, if not available;

- Reconstituted dried plasma, liquid plasma or thawed plasma alone or RBCs alone;

- Reassess the casualty after each unit. Continue resuscitation until a palpable radial pulse, improved mental status or systolic BP of 80-90 mmHg is present.

3. If in shock and blood products are not available under an approved command or theater blood product administration protocol due to tactical or logistical constraints:

- Resuscitate with Hextend, or if not available;

- Lactated Ringers or Plasma-Lyte A;

- Reassess the casualty after each 500 mL IV bolus;

- Continue resuscitation until a palpable radial pulse, improved mental status, or systolic BP of 80-90 mmHg is present.

- Discontinue fluid administration when one or more of the

above end points has been achieved.

4. If a casualty with an altered mental status due to suspected TBI has a weak or absent peripheral pulse, resuscitate as necessary to restore and maintain a normal radial pulse. If BP monitoring is available, maintain a target systolic BP of at least 90 mmHg.

5. Reassess the casualty frequently to check for recurrence of shock. If shock recurs, recheck all external hemorrhage control measures to ensure that they are still effective and repeat the fluid resuscitation as outlined above.

* Neither whole blood nor apheresis platelets as these products are currently collected in theater are FDA-compliant. Consequently, whole blood and 1:1:1 resuscitation using apheresis platelets should be used only if all of the FDA-compliant blood products needed to support 1:1:1 resuscitation are not avalaible

07/08/2013

Plasma: En préhospitalier AUSSI +++

Point-of-injury use of reconstituted freeze dried plasma as a resuscitative fluid: A special report for prehospital trauma care

Glassberg E. et All. J J Trauma Acute Care Surg. 2013;75(Suppl 2):S111YS111.

La prise en charge d'hémorrragie catastrophique en phase préhospitalière est particulièrement complexe. Ces dernières années la mise en place d'un réseau structuré de prise en charge, 'application de procédures spécifiques visant à arrêter les hémorragies au plus tôt, le recours à l'acide tranexaminique, la prévention des hypothermies et l'application d'une politique raisonnée de rénaimation/chirurgie ont constitué une grande avancée. Certaines nations ont équipé leurs vecteurs d'évacuations de concentrés érythrocytaires. Le maintien d'une coagulation optimale est un enjeu majeur. Pour cela existe, entre autres,  le plasma lyophilisé. Les forces armées israéliennes militent pour l'emploi de ce type de solutions en phase préhospitalière

16/07/2013

Colloids versus crystalloids for fluid resuscitation in critically ill patients

CristalVSColl Cochrane.jpg

There is no evidence from randomised controlled trials that resuscitation using colloids compared with crystalloids reduces the risk of death in patients with trauma, burns or following surgery. The use of hydroxyethyl starch might even increase mortality. Since colloid use is not associated with improved survival and colloids are considerably more expensive than crystalloids, it is hard to see how their continued use in clinical practice can be justified.

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| Tags : remplissage