Bloc sciatique en médecine préhospitalière

Objectives

Evaluate the analgesic efficiency of the sciatic nerve block in prehospital care at the time of some severe legs or feet traumas.

Patients and methods

Retrospective, monocentric study upon a period of time 1998–2008.

Results

Twenty-three sciatic nerve blocks have been colligated, five by upper way and heighten by lateral popliteal lower way among which fourteen without neurostimulator. The pain decrease evaluated by the EVS at T0 (before block), T1 (10 min after block) and T2 (arriving in emergency department), has been significative, whatever the measure time interval (T0–T1, T0–T2, T1–T2), the ways used and the local anaesthetics given. The analgesia installation was faster when approaching the sciatic nerve block by the upper way and when using a neurostimulator. Only one analgesic failure was observed while doing a lateral popliteal way without neurostimulator. Any complication was reported.

Conclusion

The sciatic nerve block done in prehospital shows a significant analgesic efficiency which would worth a deeper evaluation and a thought on its introduction in the ED physician's therapeutic gear.     

Traitement des vertiges selon leurs mécanismes

Vertigo is an illusion of rotatory or linear movement that demonstrates a functional or lesional disturbance of the vestibular system, from periphery to central connections. According to the ANAES report (1997), benign paroxysmal positional vertical vertigo, vestibular neuronitis and Ménière's disease account for 40-50% of all mixed vertigo etiologies. Central etiologies may account for 20-40% of causes and 10-40% remain more difficult to classify, and are usually classified under the term of “peripheral vestibulopathy.” These include vertigo due to neurovascular compression syndrome of the VIIIth nerve. Clinical manifestations, differential diagnosis, and treatment of the main etiologies of vertigo will be developed in this chapter. A specific section will discuss the subject of neurovascular compression syndrome of the VIIIth nerve. Even though some publications should be challenged, it appears that neurovascular compression syndrome of the VIIIth nerve might explain some cases of vertigo or chronic instability, with or without cochlear signs. The diagnosis is difficult and must be established on multiple clinical, electrophysiological and radiological arguments. A therapeutic test with antiepileptic drugs is helpful. The treatment includes these drugs as a first option but may require a neurosurgical approach if medical treatment fails.     

Le garrot en médecine d’urgence et militaire

Objectives

The purpose of this literature review is, after a history and a point about current situation, to present the military use and precautions of use of tourniquet for civil and military medicine.

Data sources

A review of the Anglo-Saxon and French literature was performed in PUBMED database, from 1962 to 2012. The research was conducted using the following keywords: “tourniquet”, “complications”, “haemorrhage”, “emergency”, “military medicine”, used alone or in combination.

Data extraction

The extracted data concerned the history, the epidemiology, the interest of tourniquet during peacetime and wartime, adverse effects and the ratio benefit/risk.

Data synthesis

The tourniquet is “a device which is tightened, in case of haemorrhage, around a limb in order to slow or stop the venous or arterial circulation before surgery…”. This item is thus used in surgery to reduce intraoperative bleeding and in emergency medicine as a rescue technique for bleeding places non accessible to compression or to other technical hemostasis. It is also used for treating bleeding of mass casualties. However, its use is too poorly managed by health professionals and it remains risky. Recent armed conflicts have yet revived its day use.

Conclusion

The tourniquet has utility in times of war and in peacetime. In each case, indications and complications must be known.     

La place du patient dans la médecine factuelle

Medical practice has undergone a significant evolution over the last decade due to two important factors: (1) the theory and practice of Evidence-Based Medicine (EBM) has become widely established; (2) the relationship between health-care professionals and patients or clients has been profoundly modified. In this review, we discuss the heterogeneity and variability of patient preference and the need to develop a doctor–patient relationship, which facilitates shared decision-making in preference to previous models based on patient information without choice and paternalistic attitudes. Thus, this modern concept of care based on EBM shifts the focus of interest from the disease entity itself to that of the patient suffering from a disease. The patient has a right to information concerning his illness; this information helps the patient to participate in medical decisions through the laying out of clinical practice guidelines. These aspects of the patient's role in care management are illustrated by a national program in the field of oncology which empower the patient in the decisions arrived at by a multi-disciplinary oncology team.     

Prélèvements d’organes et décès médico-légaux

Objective

There is a chronic shortage of transplants. There are many obstacles on organ procurement and some are related to forensics aspects of deaths. In these situations in France, the judge decides whether or not to perform the organ recovery. These refusals are about 40 donors per year, representing a loss of more than 120 potential transplants.

Study design

Retrospective study of 9 years (2003–2011) aimed to study the expectations of judges in comparing them with forensics issues.

Patients and methods

Sixty-two cases of organ recovery with judicial proceedings have been treated in collaboration between the Agency of Biomedicine (Northeast) and the Medico-Legal Institute of Lille (northern France).

Results

When there is a judicial opposition to an organ procurement, it is mostly upon criminal circumstances (57%). The main reason is the need to perform an autopsy (38%), raising fears of a loss of evidence because of resuscitation and surgery for the judges. However, autopsies rule out these problems if strict protocols are followed.

Conclusions

In case of forensic death, French law provides that a forensic examination to take place prior to surgical procedures. The law also provides for collaboration between caregivers and medical examiners. Nevertheless, judicial oppositions persist and appear to belong to a lack of communication between actors (judges/medical examiners/organ procurement organization). Better collaboration through protocols must be thought to satisfy the demands of justice and public health.     

Désordres hydroélectrolytiques des agressions cérébrales : mécanismes et traitements

Electrolyte disturbances are frequent after brain injuries, especially dysnatremia and dyskalemia. In neurological patients, usual clinical signs of hyponatremia are frequently confounded with clinical signs of the underlying disease. Natremia absolute value is less important than speed of onset of the trouble. Most often, hyponatremia is associated with hypotonicity and intracellular hyperhydration, which may exacerbate a cerebral edema. Distinction between inappropriate secretion of antidiuretic hormone (SIADH) and cerebral salt wasting syndrome (CSWS) may be difficult and is mainly based on assessment of patient's volemia, SIADH being associated with normal or hypervolemia and CSWS with hypovolemia. After subarachnoid haemorrhage, the most common disorder is CSWS. In this case, fluid restriction is strictly prohibited. Treatment of CSWS needs to compensate for the natriuresis and may justify the use of mineralocorticoid. It is important to avoid excessively rapid correction of hypernatremia, with a maximal speed of correction of 0.5 mmol/l/h. Serum sodium monitoring should be mandatory for the first ten postoperative days after pituitary adenoma surgery. Therapeutic barbiturate may be responsible for life threatening dyskalemia.     

Une gestion des voies aériennes à haut risque en médecine pédiatrique préhospitalière

We report the case of high-risk airway management performed in prehospital conditions in a 3-year-old boy suffering from a severe head and maxillofacial trauma. Tracheal intubation was decided because of a comatose status associated with an acute upper airway obstruction resulting in severe hypoxaemia. One minute after a rapid sequence induction, difficult laryngoscopy was encountered. Two tracheal intubation attempts failed. During maintained laryngoscopy, a pediatric angulated Eschmann-like stylet was blindly blocked into the trachea using a rotational maneuver. A tracheal tube was railroaded over the stylet while a hypoxic bradycardia installed. The young child was tracheostomized upon arrival in the hospital, and recovered without neurological complication. In the present case, neither facemask nor laryngeal mask ventilation would have been efficient because of oral cavity jaw and sub-mental pharyngeal open wounds. Since most paediatric emergency medicine physician are not familiar with infraglottic airway techniques, our observation questions the safety of rapid sequence induction in case of severe maxillofacial trauma and reinforces the value of pediatric Eschmann-like stylet. Minimal airway tools equipment for difficult paediatric airway management is discussed.     

Hémorragie cérébrale chez un enfant asthmatique ventilé : mécanismes multifactoriels

We report the case of a 7-year-old boy with acute status asthmaticus requiring mechanic ventilation in the pediatric intensive care unit. He developed a brain hemorrhage during the course of his illness. We discuss the mechanisms that may have precipitated this neurological complication.     

Transfusion massive : analyse des pratiques en fonction des dispositifs médicaux disponibles

Introduction

An assessment of practices and available medical devices during the treatment of a massive haemorrhage has been realised in the shock unit of our hospital.

Material and methods

Parameters influencing transfusion flow rate have been identified. Medical devices and equipment to accelerate the flow rate were analyzed on the basis of manufacturers’ data and users opinion in relation with their practices.

Results

The system, from blood bags to venous access, influences flow rate: red blood cell viscosity, catheter and pressure gradient. Three types of acceleration systems are available: accelerated transfusion set, pressure cuff with a gravity blood IV set and fast-flow fluid warmers. Their benefits and disadvantages are presented and discussed.

Discussion

Maximum flow rates noted by manufacturers are not the real values because some parameters such as venous catheter diameter (limitative factor) and the red blood cell viscosity (diluted or not) are not considered. The choice of an infusion system is mainly based on the technical capacities (flow rate fluctuations, pressure gradient on blood bags, warming, air purging), practical modalities of use (medical devices and assembly) and cost. The pressure cuff with transfusion gravity set should be limited to non-critical situations or during the assembly of the fast flow fluid warmers (but no warming fluids, no air embolism prevention). The accelerated transfusion set is not the best option for a shock unit because it needs an operator permanently. The fast-flow fluid warmers are recommended for all types of massive haemorrhages, they are more secure but they require a long time to be assembled.