Clinical guidelines for the practice of peripheral nerve blocks in the adult.

These guidelines, made by BARA, are, like the "Safety First Guidelines" of the SARB, clinical recomendations for a good and safe practice when performing peripheral nerve blocks (PNB). These recommendations were made according to the most recent literature and experts opinion and are therefore prone to changes due to evolution of literature. The guidelines deal with "Informed Consent", preoperative visit, monitoring, equipment and the PNB procedure itself regardless of using ultrasound or neurostimultion or both. Advise is given when combining a PNB with general anesthesia and when a catheter technique is used.

Bispectral index is a topographically dependent variable in patients receiving propofol anaesthesia.

BACKGROUND: As very strong agreement has been reported between bispectral index (BIS) values measured from the occipital and frontal skull areas, we compared BIS values measured from central and parietal areas with those from frontal area to investigate whether BIS is really a topographically dependent or topographically independent variable. METHODS: Twenty patients, ASA I-II, non-obese, aged 18-62 yr and with no neurological disorders were enrolled. Based on the 10-20 international landmarks, five silver dome electrodes were positioned: F7, C3, P7, Cz (common reference) and Fp1 (ground). Using frontal (F7-Cz), central (C3-Cz) and parietal (P7-Cz) electrode montages, the corresponding BIS values were simultaneously recorded with an Aspect A-1000 monitor (software v3.12). The BIS values were recorded at the propofol concentration allowing laryngeal mask insertion, which was maintained during the 10 min data collection period in absence of additional external stimuli. Data were analysed using the Kruskall-Wallis, Wilcoxon paired sign with Bonferroni correction, Bland-Altman and linear correlation tests. RESULTS: At the predicted effect target propofol concentration 4-8 microg ml(-1), the 10 min mean BIS (median [min-max]) were 32 [20-44], 46 [28-68] and 58 [41-72] for the frontal, central and parietal leads, respectively. Differences between these BIS recordings were statistically significant (P<0.0001, Kruskall-Wallis; P<0.005, Wilcoxon paired sign test). CONCLUSIONS: The present results provide evidence that BIS index is a topographically dependent variable in patients receiving propofol anaesthesia.

[Transsphenoidal approach with low field MRI for pituitary adenoma]. / Apport de la résonance magnétique per-opératoire à bas champs dans la chirurgie de l'adénome hypophysaire.

INTRODUCTION: Appropriate evaluation of resection remains one of the major difficulties of surgical treatment of pituitary adenoma. The transsphenoidal approach does not allow direct visual control. Endoscopy provides useful information but may no distinguish well residual adenoma from the pituitary gland. Intraoperative MRI offers new perspectives for assessing the quality of resection. We report our experience with low field intraoperative MRI in surgical treatment of pituitary adenoma. POPULATION: Intraoperative MRI (Polestar N10, 30 patients and Polestar N20, 17 patients) was performed in 45 consecutive patients undergoing surgery for pituitary adenoma. Thirty-seven patients had a macroadenoma. Patients were in the prone position with the head fixed with a three-pin MRI-compatible headholder. METHOD: Coronal T1 MRI scans with enhancement were acquired pre and per operatively. We compared scans and surgical filling (complete removal). If there was a difference, a surgical control was undertaken. RESULTS: Intraoperative images were unavailable for two patients due to small size of the neck and the pituitary glands which were not in the middle in the field of view. For the others, the pituitary glands were in the field of view and the intraoperative scans could be used for comparison. For four patients, there was a discrepancy between surgeon filling and the intraoperative MRI. A control showed no residual adenoma but hemostatic tissue. CONCLUSION: Low field intraoperative MRI is an excellent technique for controlling the size of pituitary adenoma resection.

[Prolonged asystole after spinal anesthesia in a patient with Gallavardin's syndrome]. / Asystolie prolongée après rachianesthésie chez un adulte présentant un syndrome de Gallavardin.

A clinical case of spontaneous ventricular dysrythmia in a 47-year-old patient scheduled for ankle osteosynthesis is reported. During initial peripheral vein canulation, a spontaneous ventricular tachycardia occurred and disappeared spontaneously in about 3 min. It was decided to proceed with surgery. Thirty minutes after spinal anaesthesia, asystole occurred. Normal sinus rhythm was rapidly restored after basic life support. There was no harmful consequence for the patient. He had a history of repetitive monomorphic ventricular tachycardia (Gallavardin type). The aetiologies of asystole after spinal anaesthesia are well known and will be not discussed in the text. Although the origin of the asystole is unclear in this case, the literature on Gallavardin's syndrome is reviewed, showing that a prolonged and complex preoperative assessment is not mandatory in this syndrome.

[The neuro-anaesthesiology assisted by the electroencephalogram]. / La neuro-anesthésie assistée par l'électroencéphalogramme.

The electrophysiology can be considered as one of the most reliable assessment of the nervous system function during anaesthesia. For instance, the electroencephalogram (EEG) can be relatively easily simplified and adapted to the current practice of the neuro-anaesthesia or neuro-intensive medicine. Since approximately 10 years, some extremely simplified devices have been introduced, but they allowed only inaccurate assessment because of their too global analysis of the brain function. The monitoring of the true digitised EEG, based on a simplified brain mapping montage combined to the analysis in the frequency and the time domains corresponds to a new investigation tool: the simplified EEG or sEEG, which can be included in our usual monitors or anaesthesia and intensive care machines. This new sort of monitoring could give us valuable information about, first, the control of the peroperative consciousness and the nociceptive or not afferent inputs due to surgical stimulations, and, second, the detection of several particular physiopathologic states during neuro-anaesthesia (brain ischaemia, non-convulsive epilepsy, cerebral protection em leader ). These different theoretical and practical topics are reviewed to try to define the possible preliminary rules of the use of the sEEG.

[The anesthesiology-recovery department]. / Le Service d'Anesthésiologie Réanimation.

The Department of Anesthesiology and Reanimation is organised in units with clinical activities, which include the pre-operative care of patients, anesthesiological care and immediate post-operative supervision. Two post-operative treatment rooms also form part of the department. The main fields of research of the various units result from collaborations with other departments of Hôpital Erasme, in particular with regard to the development of advanced techniques or fit within the confines of the speciality.

Plexic analgesia with ropivacaine for lower limb surgery.

Modern plexic analgesia for limb surgery is firstly defined. The characteristics and goals of this kind of technique are enumerated. The procedures used in our institution are reviewed. The new evolution of plexic patient-controlled-analgesia is introduced. Secondly, the recent literature about plexic analgesia and ropivacaïne is reviewed. Finally preliminary results comparing ropivacaïne and bupivacaïne for psoas compartment and epidural analgesia are presented.

Predictive accuracy of target-controlled propofol and sufentanil coinfusion in long-lasting surgery.

BACKGROUND: The predictive accuracy of target concentration infusions of propofol has been documented only for less than 4 h, and no prospective study of sufentanil target controlled infusion is available. The authors investigated the predictive accuracy of pharmacokinetic models for propofol and sufentanil coadministered during long-lasting surgery. METHODS: Ten patients, American Society of Anesthesiologists physical status I and II, were studied during extended cervicofacial surgery. Target controlled infusion of propofol and sufentanil was administered during surgery using decisional algorithms, taking into consideration pain assessment, hemodynamic changes, and peroperative blood losses. Intrasubject data analysis included calculation of performance error, median performance error, median absolute performance error, divergence, and wobble. RESULTS: The range of plasma target concentrations was 2-5 microgram/ml for propofol and 0.2-1 ng/ml for sufentanil. Median performance error was -12.1% for propofol and -10% for sufentanil. The wobble values were 11.6% and 22.3% for propofol and sufentanil, respectively. The pharmacokinetic sets used slightly overpredicted the concentrations, with negative values of divergence of 2.92% and 0.22% units/h for propofol and sufentanil, for a mean infusion period of 762 min. CONCLUSIONS: This prospective study demonstrates the predictive accuracy of the pharmacokinetic model for sufentanil infusion and confirms that for propofol during long-lasting surgery using standardized rules for the management of target controlled infusion and blood loss replacement.

First results of a clinical pilot study on intraarterial chemotherapy with haemofiltration of locally advanced gastrointestinal cancers.

Intra-arterial chemotherapy combined with haemofiltration enables the administration of drugs to confined neoplastic tissue while limiting the systemic drug exposure. During the procedure, the cytotoxic drugs are injected into the arterial supply of the tumour and the venous blood coming from the tumour bed is pumped out and filtered trough haemofiltration unit in order to extract the cytotoxic drug not fixed on the tumour. The patients selected for such treatment failed previous intravenous chemotherapy. Thirteen patients underwent intra-arterial chemotherapy injections combined with haemofiltration procedures: 8 unresectable liver metastases from colorectal cancer and 5 pelvic recurrences from rectal cancer. Fluorouracil, mitomycin C and doxorubicin were infused. One out of thirteen patients presented a complete regression of his liver metastases, 5/13 presented a partial regression, 2/13 patients did not show any significant modification of the size of their lesions and were classified as stable disease, 5/13 patients showed a progression of their neoplastic disease. No nephrotoxicity or major gastrointestinal side effects were observed. Intra-arterial chemotherapy combined with haemofiltration procedure is a therapeutic modality that could be considered in patients with locally advanced cancer who failed previous first line intravenous chemotherapy.