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Succinylcholine is a neuromuscular block whose duration of action depends on rapid hydrolysis by butyrylcholinesterase (BChE). In patients with common BChE activities, succinylcholine duration of action is short (10min). BChE deficiency induces a slower hydrolysis of the drug and consequently prolonged neuromuscular block, leading to apnea. We report a case of prolonged neuromuscular block after administration of succinylcholine in a 14-year-old boy. Biological investigations revealed a marked BChE deficiency (1099U/L) related to the presence of three point mutations in the BCHE gene in a compound heterozygous state: p.Asp70Gly (rs1799807), p.Ala539Tyr (rs1803274), and p.Phe118Valfs*12 (rs398124632). The diagnosis of genetic BChE deficiency (OMIM 177400) was retained. This case is intended to present the pathophysiology of genetic BChE deficiency, its management, and the diagnostic strategy to be implemented.

An incarcerated uterus refers to the retroversion of a pregnant uterus within the pelvis due to the absence of a forward tilt at the end of the first trimester. An incarcerated uterus that is overlooked or only discovered perpartum can cause severe obstetrical complications. Several authors have shared their experience with uterine incarceration management at 12, 14, and 16 weeks of amenorrhea.Our report concerns a case of uterine incarceration management at 21 weeks of amenorrhea, achieved by way of a specific anesthesia protocol and the positioning of the patient, which allowed the disimpaction of the uterus with the help of external maneuvers. No recurrence was observed.Uterine incarceration management is possible beyond 16 weeks of amenorrhea.

In light of the recent emergence of a growing incidence and of an increasing number of notices to the pharmacovigilance of anaphylaxis shocks to succinylcholine in different French hospitals, this study provides an update on current knowledge about allergic shock to curare. It also provides an example of pharmacovigilance in France. This work makes a comparative analysis of the literature and research hypotheses that could explain this significant outbreak. Material and methods: this is a retrospective study of 19 cases of anaphylaxis to succinylcholine which occurred between 2010 and 2013 in two French university hospitals. Data from diagnostics, immediate biological and allergy tests were collected. Hemodynamic changes, ventilation, and the therapeutic management of these shocks were extracted from the consultations and anesthesia sheets. Results: 18 cases were validated. One case was withdrawn further to negative skin tests. Skin tests were not performed in two cases but these cases were kept on the basis of clinico-biological concordance and the absence of alternative diagnosis. A large proportion of severe shocks has been registered with 78% grade III and 22% grade IV. 39% patient’s had an allergic tendency. The injections were performed for 61% in the framework of scheduled surgery; for 28% in order to anticipate a difficult intubation; and for 61% because of inhalation risk or suspicion of full stomach. Bronchospasm and rash are often absent in favor of hemodynamic signs. Four hypotheses have been advanced to explain this outbreak.; Devant l’apparition récente d’une augmentation d’incidence et de déclarations à la pharmacovigilance de chocs anaphylactiques à la succinylcholine dans différents hôpitaux français, cette étude fait le point sur les connaissances actuelles concernant les chocs allergiques à ce curare. Elle donne un exemple de pharmacovigilance en France. Ce travail fait l’analyse comparative de la littérature et recherche les hypothèses pouvant expliquer cette recrudescence significative. Matériel et méthode : il s’agit d’une étude rétrospective de 19 cas de chocs anaphylactiques à la succinylcholine survenus entre 2010 et 2013 dans 2 centres hospitalo universitaires français. Les données des bilans diagnostics, biologiques immédiats et des bilans allergologiques ont été colligés. L’évolution hémodynamique, ventilatoire, ainsi que la prise en charge thérapeutique de ces chocs ont été extraits des consultations et des feuilles d’anesthésies. Résultats : 18 cas ont été validés. Un cas a été retiré sur la négativité des tests cutanés. Deux cas n’ont pas effectué leurs tests cutanés et ont été conservés sur la concordance clinico-biologique et l’absence de diagnostic différentiel. Il apparaît une forte proportion de chocs graves avec 78% de grade III et 22% de grade IV. Parmi les patients, 39% avaient un terrain allergique. Les injections se font pour 61% dans le cadre de chirurgies programmées avec 28% en prévision d’une intubation difficile et 61% pour risque d’inhalation ou suspicion d’estomac plein. Le bronchospasme et le rash cutané sont souvent absents au profit des signes hémodynamiques. Quatre hypothèses sont avancées pour expliquer cette recrudescence de cas.

The French National Pharmaceuticals Agency (ANSM) has recommanded in July 2012 not to break the cold chain before using succinylcholine (Celocurine®).to understand the pre-clinical evolution of the conservation modes of this curare.Descriptive study before (year 2011) and after (year 2012).Online survey to French Samu/Smur.SMUR location, conservation method at clinical base, in the mobile unit (UMH) and at the patient. Principal decision criteria: evolution of the conservation modes before and after the recommendation (qualitatives variables compared with a Fisher test).Out of 101 SAMU/SMUR, 62 answered. Conservation modes of succinylcholine vials were significantly different (P0.001). Proper conservation was observed in 26 % of the cases before and 43 % after. Mobile units (UMH) equipped with a fridge increased from one out of two to 77 %. The lack of conservation modes passive or active on UMH went from 31 % to 3.4 % with isotherms bags with ice when a fridge was not available. The destruction of capsules at current temperature in a 24-hour period increased: 22 % before, 47 % after (P=0.04).After recommendations from ANSM, conservation modes and destruction of succinylcholine in a prehospital environment were significantly impacted.

Patients who are given a single dose of succinylcholine normally undergo a short-acting depolarizing phase I neuromuscular block but rarely a phase II block. Prolonged neuromuscular blockade occurs after a single dose of succinylcholine in case of genetically determined abnormal plasma butyrylcholinesterase activity. It is mandatory to use monitoring to detect this side effect. We report a case of a patient with abnormal plasma butyrylcholinesterase activity undergoing a six-hour prolonged neuromuscular phase II block, after a single dose of succinylcholine.

A patient presenting with paramyotonia congenita (Eulenburg's paramyotonia) was seen at the preanaesthetic visit during pregnancy. The underlying disease was known for years. Analysis of the literature and advice taken from specialists emphasized the safe use of regional anaesthesia and analgesia which was indeed used for labour and delivery without any complication. By contrast, the limited information available on the use of general anaesthesia suggests the risks associated with the use of succinylcholine and possibly with halogenated agents. Additional and useful factors that may limit the occurrence of myotonic crises such as maintenance of normal temperature and plasma potassium concentration, should be undertaken simultaneously.

Evaluate the changes in potassium following rapid sequence induction with succinylcholine in critically ill-patients and determine whether hospital length of stay could influence the succinylcholine-induced hyperkaliemia.Prospective and observational study.After approval by our local ethical committee, we prospectively included 36 patients admitted from more than 24hours in ICU and who required succinylcholine for rapid tracheal intubation (1mg/kg). Serum potassium was measured before, 5 and 30min after succinylcholine. The incidence of life-threatening hyperkaliemia (≥6.5mmol/L) was noted.We could observe significant and transient increase in serum potassium (median increase of 0.45 [0.20-0.80] mmol/L at five minutes). A significant relationship was observed between the ICU length of stay and arterial potassium increase (r=0.37, P0.05). From the ROC curve, a threshold of 12 days had an 86% sensitivity and 69% specificity in discriminating patients in whom the potassium increase was more than 1.5mmol/L.Induction with succinylcholine is followed by significant but transient hyperkaliema. The ICU length of stay before giving succinylcholine could influence significantly the amplitude of potassium increase.

To evaluate the use of neuromuscular blocking agents (NMBA) in the French adult Prehospital Emergency Medical Services (PEMS).Telephone survey of practices.A survey was conducted from April to July 2009 in every PEMS of the South-East of France. A PEMS physician by center was interviewed using a standardized quiz including demographic data, methods of anesthetic induction, use of NMBA and succinylcholine.All 86 EMS were interviewed. Succinylcholine was used in 98% of cases for rapid sequence induction. Nondepolarizing NMBA were never used by 38%. They were not available in 21% of PEMS. Among the practitioners using them, 79% prescribed them rarely (less than 25% of intubated patients). Nondepolarizing NMBA were prescribed in more than half of cases of patient ventilator asynchrony by 27% of physicians, of ventilator high pressure (23%), of acute status asthmaticus (23%), of suspicion of intracranial hypertension (22%), of refractory hypoxemia (16%), therapeutic hypothermia (10%). Limitations of prescription were essentially little guidance and lack of training. Atracurium and cisatracurium were the most used. The exact dosages were known by only 18% of practitioners. None of the practitioners were performing a monitoring of NMBA.This survey highlights the very frequent use of succinylcholine for rapid sequence induction and low use of nondepolarizing NMBA for selected indications. A training endeavor could be undertaken to improve the use of these anesthetic drugs by prehospital physicians.

Anaphylactic shock can sometimes take the appearance of heart failure, in relation to an acute coronary syndrome, even with normal coronary arteries, that we illustrate by two observations. We firstly report the case of an anaphylactic shock caused by succinylcholine, after anesthesia induction for inguinal hernia surgery in a 50-year-old man with cardiovascular risks, who presented with ventricular fibrillation followed by a cardiac arrest. An acute and severe anterior coronary syndrome was suspected and treated with thrombolysis. Then the electrocardiogram normalized, as well as the left ventricular function. No significant coronary stenosis was retrospectively revealed by coronarography, and a severe coronary vasospasm induced by the anaphylactic reaction was confirmed. We also describe the case of an anaphylactoid shock caused by cisatracurium infusion, that occurred at the beginning of an adnexectomy in a 55-year-old woman without any particular history. She presented with a cardiogenic shock after intravenous administration of epinephrine. The echocardiograpghic evaluation pointed out an aspect of stress-induced cardiomyopathy, and the coronarography showed normal coronary arteries. The left ventricular dysfunction completely normalized, strongly suggesting the diagnosis of Takotsubo-like syndrome after the anaphylactic shock and its treatment. Both of these cases point out the major interest of cardiologic and allergic evaluation in case of heart failure during general anesthesia. Coronary vasospasm and stress-induced cardiomyopathy are two pathologies that may be observed during anaphylactic shock, and their diagnosis should be considered after elimination of coronary thrombosis.

We report the occurrence of cardiac arrest shortly after the anaesthetic induction for thyroidectomy in a patient with decompensated thyrotoxicosis associated with taking amiodarone. After investigation, it was revealed that the cardiac arrest was linked to an anaphylactic reaction to suxamethonium. This accident, unrelated to hyperthyroidism, reminds us of the relative frequency and severity of anaphylactic reactions related to curare. This event, in the context of severe cardiac insufficiency, due to an amiodarone-associated thyrotoxicosis, is described here for the first time. Its diagnosis requires to remain consistent. Its support must be in compliance with the recommendations of learned societies of anaesthesia.

A young woman, with a contact dermatitis to nickel, experienced a life threatening anaphylaxis after induction of general anaesthesia for an emergency curettage. Hypersensitivity reaction involving IgE antibodies against succinylcholine was proven by positive skin test and radioimmunoassay detection of antibodies against succinylcholine and quaternary ammonium. After restoration of haemodynamics in a few hours, the patient had rhabdomyolysis predominant at lower left leg, which required a fasciotomy. An haemodialysis session was necessary, renal function being normalized thereafter. Several months later, the patient suffers from dysesthesia on the leg and foot. Muscular ischaemia was the consequence of the shock, the external compression due to the compression stockings probably being an additional factor.

Anaphylaxis is a relative uncommon event in pregnancy that can have serious implications for both mother and foetus. Two cases of grade 3 anaphylactic shock occurring at the end of the third trimester of pregnancy are reported; the causal agents were respectively amoxicillin and suxamethonium. Maternal and foetal outcome was good after adequate resuscitation and caesarean section performed in both cases because of severe bradycardia. A review of the literature confirms the good maternal outcome; neurologic damage in the newborn is frequent. On the basis of physiologic findings degranulation of placental mast cell is evoked in the genesis of birth asphyxia.

Peroperative haemodynamic profile comparison of two anaesthetic protocols for emergency abdominal surgery of old patients.Non-randomized monocentric study. Patients in the Optimization group were prospectively studied. Anaesthesia was induced by etomidate-succinylcholine and maintained with effect site and end-tidal target controlled administration of remifentanil and desflurane respectively to keep the BIS values between 45 and 55. These patients were matched with retrospectively studied patients constituting the Control group. The latter's were anaesthetized with etomidate-succinylcholine and anaesthesia was maintained by manually controlled administration of sufentanil and desflurane to keep systolic arterial pressure (SAP) within a range of more or less 30% of preoperative baseline SAP.Twelve patients (86+/-5 yrs) were included in the Optimization group, 11 (86+/-4 yrs) in the Control group. The time spent at a SAP within more or less 30% of baseline values was 92+/-7% and 71+/-29% of total anesthesia time in the Optimization and Control groups respectively (p0.05). That spent at a SAP less than 15 and 30% of baseline values was 23+/-11% et 3+/-5% of total anaesthesia time in the Optimization group, whereas in the MAN group it was 65+/-21% and 27+/-30% respectively (p0.05). Desflurane and ephedrine consumption was less in the Optimization group as well as crystalloid or colloid volume loading.Anaesthetic agents target controlled administration and/or neurophysiologic depth of anaesthesia monitoring improve the time course of the haemodynamic effects in elderly patients undergoing abdominal surgery in emergency.

The Tako-Tsubo syndrome (or transient left ventricular apical balloning) is a new clinical entity, very similar to acute myocardial infarction, but different by its excellent short-term prognosis. It has been reported after a physical or an emotional stress, and it is diagnosed by a coronary angiogram and a left ventriculography. We report here a case of Tako-Tsubo syndrome related to an anaphylactic shock caused by succinylcholine during general anaesthesia of a female patient, wearing an unadjustable gastric band.

The goal of this study was to determine if ephedrine could improve intubating conditions when it is administered before the muscle relaxant (rocuronium and succinylcholine).In this prospective randomized double-blind study, 80 patients ASA I- II, scheduled for elective surgery, were allocated randomly to receive: succinylcholine 1mg/kg+ephedrine 70 microg/kg (Group I, n=20); rocuronium 0.6 mg/kg+ephedrine 70 microg/kg (Group II, n=20); succinylcholine 1mg/kg+0.9% saline (Group III, n=20); rocuronium 0.6 mg/kg+0.9% saline (Group IV, n=20). Induction of anaesthesia started with administration of the first syringe containing either ephedrine or saline, then 30s later propofol 2.5mg/kg and fentanyl 3 microg/kg, were administered followed by the contents of the second syringe containing either rocuronium or succinylcholine. Thirty seconds after injection of the muscle relaxant, another blinded staff anaesthetist performed intubation of the patient. Intubating conditions were evaluated according to criteria's of the conference of Copenhagen. Heart rate, systolic blood pressure and diastolic were also noted. Kruskall-Wallis test for non-parametric variable and Student t test for quantitative variables were used for statistical analysis.There was no significant difference between the groups concerning age, sex, BMI and ASA status. Pretreatment by ephedrine improved significantly (p0.0001) intubating conditions after succinylcholine and rocuronium.Use of ephedrine 30 seconds before induction with propofol, fentanyl followed by rocuronium or succinylcholine provides faster good conditions of intubation.

We report the case of a prolonged neuromuscular blockade in an 18-month-old age girl following administration of a usual dose of succinylcholine. The diagnosis was highly suggested by the clinical history while cholinesterase activity was included in adult normal values but below values of a personal series of 41 small children. The familial analysis of dibucaine and fluoride number confirmed the hypothesis of an atypical variant (AA phenotype). The cholinesterase activity is higher in small children than in adult and has to be analysed according to the age.

Electroconvulsive therapy (ECT) requires repeated short-term anaesthesia with muscle relaxation and deep narcosis and uses several anaesthetic agents. The aim of this study was to assess the quality of the anaesthetic technique applied for ECT by comparing two products: propofol and etomidate.This was a prospective randomised study that included ECT sessions. Patients were distributed into two groups. Patients of Group 1 underwent general anaesthesia with propofol (1.5mg.kg(-1)) and succinylcholine (0.75 mg.kg(-1)). Patients of Group 2 were administered etomidate (0.15 mg.kg(-1)) and succinylcholine (0.75 mg.kg(-1)). None of the patients included had any absolute or relative contraindication to ECT.104 sessions were included, with 52 sessions per group. Group 1 was composed of 12 patients and Group 2 of 13. The demographical characteristics and indication for ECT were comparable in the two groups. There was no haemodynamic variation (notably drop in blood pressure) between the groups. The duration of seizures was significantly more prolonged in the etomidate group (28.76 +/- 3.29 seconds) than in the propofol group (23.84 +/- 7.18 seconds), with significant difference (p = 0.000018). Awakening was calm in both groups.The pharmacological properties of propofol and etomidate reply precisely to the requirements of anaesthesia for ECT. Nevertheless, no drop in blood pressure was observed with the greater prolongation of seizures in the etomidate group compared with the propofol group.

Mivacurium and succinylcholine are short-acting neuromuscular blocking drugs. The duration of their action depends on their rapid hydrolysis by plasma cholinesterase or butyrylcholinesterase. More than thirty genetic variants of this enzyme have been described but the atypical variant is the most frequently involved in prolonged apnoea following the administration of these two myorelaxants. We present one case of patient who presented a five hours long apnoea associated with null cholinesterase activity and detection of a butyrylcholinesterase silent variant (Sil-1, 1 for 100,000 persons in population) after sequencing.

Malignant hyperthermia is a potentially fatal pharmacogenetic disease triggered by volatile anesthetics and/or succinylcholine. Dysregulation of intracellular calcium homeostasis is the trigger of the acute crisis. Malignant hyperthermia crisis correspond to an hypermetabolic state, which occurred acutely and interesting skeletal muscular cell. Early manifestations grouped tachycardia, tachypnea, masseter spasm, mixed acidosis and raise of the end expiratory CO2 pressure. Hyperthermia is a late sign, rhabdomyolysis is a sign of the severity of the malignant hyperthermia. The successful treatment is based on an early diagnosis, immediately interruption of triggering agents, intravenous administration of Dantrolene in sufficient dosage and starting of adequate symptomatic treatment. Prevention of this complication is based on asking the patient about genetic predisposition to malignant hyperthermia. Confirmation of the susceptibility to malignant hyperthermia can be provided by in vitro contracture test with halothane or caffeine after muscle biopsy.

Rapid sequence intubation (RSI) with the association of etomidate and succinylcholine is the French "Gold standard" for urgent "full stomach" endotracheal intubations. The aim of this study is to assess the fentanyl as a co-induction agent to take over the sedation between the RSI and the keeping of sedation, which is a critical period in which harmful neuro-vegetatives events, and awakening signs are frequently seen.Randomized, double blind controlled prospective study, after acceptation by the local ethical committee.Three groups of patients undergoing RSI in the intensive care unit and by the out-of-hospital medical team were compared: group A patients received fentanyl 3 micrograms kg-1 during RSI, before paralysis was induced. Group B patients received the same dose of fentanyl immediately after endotracheal intubation. Group C patients did not received fentanyl (control group). Outcome measures were awakening signs arrival (respiratory movements, eyes opening, spontaneous limb movements), Ramsay score assessment, and haemody namics. Attempt at intubation and vomiting incident were also measured. Discrete data were compared by chi-2 analysis, continuous data were compared with two-way analysis of variance. A p value0.05 was the significant threshold.Thirty-six patients were enrolled and completed the study. All the included patients presented awakening signs. The use of fentanyl did not prevent the recourse of other sedative medications. Ten minutes after endotracheal intubation, significant differences has been noticed for the awakening signs arrival between fentanyl groups (A: 42% and B: 36%) and control group (C: 77%). The Ramsay score evolution follows the same variation. All the patients were intubated on the first attempt, there was no vomiting incident noticed.The use of fentanyl, as a co-induction agent with etomidate and succinylcholine during RSI, allows a significant delay of the awakening signs arrival and attenuate the neurovegetative response during the minutes after endotracheal intubation after RSI, without deleterious haemodynamic effects.

To review current data on butyrylcholinesterase.Search through Medline data bases of articles in French or English.Original articles and case reports were selected. Letters to editor were excluded.The articles were analyzed in order to obtain current data on biochemical structure, action, major pathological variations, especially with regard to the recent informations obtained by molecular biology concerning the identification of genetic variants.Butyrylcholinesterase must be differentiated from acetylcholinesterase, which cannot hydrolyse succinylcholine. The physiological action of butyrylcholinesterase remains unknown, although it can hydrolyse many drugs. Excluding genetical mutations, several physiopathological situations alter butyryl-cholinesterase activity. Butyrylcholinesterase activity assessment does not allow the diagnosis of genetic variants. Whatever the origin, only deficits of more than 50% modify significantly the metabolism of succinylcholine or mivacurium. The diagnosis of a prolonged neuromuscular blockade is obtained with systematic monitoring of the neuromuscular function in case of administration of mivacurium or succinylcholine. Mivacurium should only be re-injected when one response at train of four is obtained. In case of prolonged neuromuscular blockade, the anticholinesterasic agent should not be administered when no response at train of four is obtained. The biochemical methods using inhibitors (dibucaine, fluoride) of the butyrylcholinesterase and a familial study lead to the diagnosis in most cases because the atypical and fluoride variants are the most frequent. When results are doubtful, genetic molecular methods with the use of PCR and restriction enzymes allow a rapid diagnosis.

The choice of sedation for emergency intubation remains controversial. This lack of consensus has led to various sedation protocols used in French prehospital care setting. A review of data from the literature suggests that the association etomidate-suxamethonium is probable the best choice for rapid sequence intubations in the prehospital setting. Its benefits include protection against myocardial and cerebral ischaemia, decreased risk of pulmonary aspiration, and a stable haemodynamic profile. Randomized studies are needed to substantiate the advantages of the association etomidate-suxamethonium for rapid sequences intubation in the prehospital setting.

A case of a 28-day-old infant who developed suxamethonium apnoea is described. He was found to be homozygous for atypical cholinesterase. Main characteristics of this disorder are reviewed. Other causes of prolonged apnoea in infants recovering from anaesthesia for surgery of pyloric stenosis are discussed.

To investigate complications of emergency endotracheal intubation (EEI), possibly facilitated by rapid-sequence induction, in the prehospital critical care setting: 1) the difficulty of intubation; 2) the cardiorespiratory consequences of intubation; 3) the relationship between the occurrence of complications and prognosis.Prospective non randomized, open study.All patients treated over a 5-month period by a physician-manned ambulance service and requiring EEI.Patients were allocated either in with cardiac arrest (CA) group or a group with maintained spontaneous circulation (SC). Difficulty of intubation was assessed by the number of attempts.Two hundred and twenty-four consecutive EEI were carried out by physicians (46%) and residents (38%) not trained in anaesthesia, anaesthetists (8%), or nurse anaesthetists (7%). Trachea was intubated after a maximum of three attempts in all patients. Success rate at the first attempt was 91%. It was 92% in CA patients (n = 76) and 90% in SC patients (P = 0.59). Anaesthetic induction, with (n = 112) or without (n = 12) succinylcholine, was used to facilitate 84% of intubations in SC patients. Complications occurred in 30 patients (20%). There was no relationship between the latter and hospital mortality, duration of ventilatory support, duration of stay in the intensive care unit.In this study, EEI in SC patients was frequently facilitated by rapid sequence induction and was associated with a high success rate at the first attempt, as in CA patients. Morbidity was low. All physicians involved in emergency airway management should be skilled in this technique.

A young woman without remarkable medical history, experienced a life threatening anaphylactoid reaction after induction of general anaesthesia for an emergency curettage. Hypersensitivity reaction involving IgE antibodies against suxamethonium was proven by positive skin test and detection of specific IgE by radio-immuno assay. After intensive therapy for 2 to 3 hours, the patient exhibited rhabdomyolysis localized on both calves. This complication, which required fasciotomies, did not result in renal failure. Local and general outcome was good. Rhabdomyolysis was due to compartmental ischaemia following shock and local external compression in the lithotomy position.