Pilot study of closed-loop anaesthesia for liver transplantation.

BACKGROUND: Automated titration of propofol and remifentanil guided by the bispectral index (BIS) has been used for numerous surgical procedures. Orthotopic liver transplantation (OLT) uniquely combines major changes in circulating volume, an anhepatic phase, and ischaemia-reperfusion syndrome. We assessed the behaviour of this automated controller during OLT. METHODS: Adult patients undergoing OLT were included in this pilot study. Consumption of propofol and remifentanil was calculated for each surgery period (dissection, anhepatic, and liver reperfusion phases). Arterial blood samples were collected at several time points to allow comparison of actual with calculated propofol and remifentanil concentrations. Data are presented as median [25th and 75th percentiles] or percentage (95% confidence interval). RESULTS: Thirteen patients were studied. System performance, defined as the percentage of time with BIS in the range 40-60, was 88% (86-94) of the total duration of anaesthesia. Propofol requirement was decreased during the anhepatic phase compared with the dissection phase (2.9 [1.9-5.0] mg kg(-1) h(-1) and 4.6 [3.5-8.1] mg kg(-1) h(-1); P<0.03) while remifentanil consumption was unchanged (0.11 [0.09-0.19] µg kg- (1) min(-1)). Bland-Altman analysis showed a weak concordance for propofol (bias of 0.7 µg ml(-1) and limits of agreement of -2.2 to +3.7 µg ml(-1)) and remifentanil (bias of 1.3 ng ml(-1) and limits of agreement -4.3 to +6.8 ng ml(-1)). No adverse events were reported during anaesthesia. CONCLUSIONS: This pilot study indicates that automated titration of propofol and remifentanil guided by the BIS is feasible during OLT.

Efficacy of intraoperative dexmedetomidine compared with placebo for surgery in adults: a meta-analysis of published studies.

Dexmedetomidine (Dex) demonstrates sedative and analgesic effects. We investigated the intraoperative and postoperative effects of intraoperative Dex administration during surgery in adult patients. A search for randomized placebo-controlled trials was conducted in Pubmed and Embase databases to identify randomized controlled clinical trials using intraoperative Dex for surgery in adult population. Outcome assessed were: intraoperative and postoperative opioid consumption, time of recovery from anesthesia, postoperative pain, and postoperative nausea or vomiting (PONV) in the first 24 hours. Data from each trial were combined to calculate pooled odds ratios (OR), mean difference (MD) or standardized mean difference (SMD) and 95% confidence interval (95 % CI). Heterogeneity was measured using I² statistics. Eighteen randomized controlled trials were analyzed. Dex was administered to 815 patients and 410 received placebo. Overall, Dex significantly decreased intraoperative opioid consumption (SMD=-1.58 [-2.98, -0.19], I²=95 %, P<0.00001), but did not decrease time of recovery from anesthesia (SMD=-0.13 [-1.60, 1.34] minutes, I²=95 %, P<0.00001). Dex significantly reduced postoperative opioid consumption (SMD=-1.58 [-2.98, -0.19], I²=95 %, P<0.00001), postoperative pain intensity (SMD=-0.73 [-1.19, -0.27], I²=62 %, P=0.03), and the prevalence of PONV (OR=0.43 [0.27, 0.69], I²=0 %, P=0.46). This meta-analysis shows that intraoperative Dex administration in adult patients reduces intra and postoperative opioid consumption, postoperative pain and PONV. Time of recovery is not affected.

[Preoperative cardiac-risk assessment for non-cardiac surgery: The French RICARDO survey]. / Évaluation du Risque CARDiaque de l'Opéré (RICARDO) : enquête nationale auprès des anesthésistes-réanimateurs concernant la prise en charge périopératoire du patient à risque cardiaque.

OBJECTIVES: Professional practice evaluation of anaesthesiologist for high cardiac-risk patient cares in non-cardiac surgery, and assess disparities between results and recommendations. MATERIALS AND METHODS: Since June to September 2011, a self-questionnaire was sent to 5000 anesthesiologist. They were considered to be representative of national anesthesiology practitioner. Different items investigated concerned: demography, preoperative cardiac-risk assessment, modalities of specialized cardiologic advice, per- and postoperative care, and finally knowledge of current recommendations. RESULTS: We collected 1255 questionnaire, that is to say 25% of answers. Men were 73%, 38% were employed by public hospital; 70% worked in a shared operating theatre with a general activity. With regards to preoperative assessment, 85% of anaesthetists referred high cardiac-risk patient to a cardiologist. In only 16% of answer, Lee's score appeared in anaesthesia file to assess perioperative cardiac-risk. Only 61% considered the six necessary items to optimal estimate of cardiac-risk. On the other hand, 91% measured routinely the exercise capacities by interrogation. The most frequently doing exam (49% of anaesthetist) was an electrocardiogram in elderly patient. In 96% of case, beta-blockers were given in premedication if they were usually thought. Clopidogrel was stopped by 62% of anesthetist before surgery. In this case, 38% used another medication to take over from this one. Only 7% considered revascularization in coronary patient who were effectively treated. POISE study was know by 40% of practitioner, and 18% estimated that they have changed their practice. Preoperatively, 21% organized multidisciplinary approach for high-risk patient. During surgery, 63% monitored the ST-segment. In postoperative period for cardiac-risk patient, only 11% prescribed systematically an ECG, a troponin dosage, a postoperative monitoring of ST-segment, a cardiologic advice. In case of moderate troponin elevation, they were 70% to realize at least an ECG and/or an echocardiography. CONCLUSION: This study highlights some difference between current recommendation concerning assessment of cardiac-risk patient in non-cardiac surgery and daily practice of anesthetist, justifying regular update of this one.

Deviation from a preoperative surgical and anaesthetic care plan is associated with increased risk of adverse intraoperative events in major abdominal surgery.

BACKGROUND: Perioperative coordination facilitates team communication and planning. The aim of this study was to determine how often deviation from predicted surgical conditions and a pre-established anaesthetic care plan in major abdominal surgery occurred, and whether this was associated with an increase in adverse clinical events. METHODS: In this prospective observational study, weekly preoperative interdisciplinary team meetings were conducted according to a joint care plan checklist in a tertiary care centre in France. Any discordance with preoperative predictions and deviation from the care plan were noted. A link to the incidence of predetermined adverse intraoperative events was investigated. RESULTS: Intraoperative adverse clinical events (ACEs) occurred in 15 % of all cases and were associated with postoperative complications [relative risk (RR) = 1.5; 95 % confidence interval (1.1; 2.2)]. Quality of prediction of surgical procedural items was modest, with one in five to six items not correctly predicted. Discordant surgical prediction was associated with an increased incidence of ACE. Deviation from the anaesthetic care plan occurred in around 13 %, which was more frequent when surgical prediction was inaccurate (RR > 3) and independently associated with ACE (odds ratio 6). CONCLUSION: Surgery was more difficult than expected in up to one out of five cases. In a similar proportion, disagreement between preoperative care plans and observed clinical management was independently associated with an increased risk of adverse clinical events.

[From medical complication to compensation for the prejudice]. / De la complication médicale à l'indemnisation du préjudice.

Claims in anesthesia and intensive care remains high, despite the reduction of morbidity and mortality associated with this activity. The absence of a national register makes it difficult to quantify. The Medical Committee of MACSF-Sou Medical Group, professional liability insurer of more than half of French physicians, provided us support. The amount of compensation paid is growing and the scope of compensated damage is expanded by the Dintilhac mission. The Act of March 4, 2002 has fully confirmed the principle of medical liability for misconduct. Generally, compensation for bodily injury is based on the demonstration of a causal link between a wrongful event and injury. The proof of fault lies with the applicant. Information accountable to patients and nosocomial infection are a particular setting. The Act of March 4, 2002 has also defined the concept of therapeutic risk. With the establishment of the Regional Commissions of Conciliation and Compensation (RCCI) and the National Office for Compensation of Medical Accident (Oniam), it is now possible for a patient to be compensated for an injury resulting from an accident Medical non-offending, while acknowledging the lack of accountability of the practitioner. The expertise conducted by an RCCI is adversarial. For the practitioner called to the cause, it is important to prepare for both substance and form, with the assistance of the medical board's insurance company.

Impact of preoperative maintenance or interruption of aspirin on thrombotic and bleeding events after elective non-cardiac surgery: the multicentre, randomized, blinded, placebo-controlled, STRATAGEM trial.

BACKGROUND: Patients receiving anti-platelet agents for secondary cardiovascular prevention frequently require non-cardiac surgery. A substantial proportion of these patients have their anti-platelet drug discontinued before operation; however, there is uncertainty about the impact of this practice. The aim of this study was to compare the effect of maintenance or interruption of aspirin before surgery, in terms of major thrombotic and bleeding events. METHODS: Patients treated with anti-platelet agents for secondary prevention and undergoing intermediate- or high-risk non-cardiac surgery were included in this multicentre, randomized, placebo-controlled, trial. We substituted non-aspirin anti-platelets with aspirin (75 mg daily) or placebo starting 10 days before surgery. The primary outcome was a composite score evaluating both major thrombotic and bleeding adverse events occurring within the first 30 postoperative days weighted by their severity (weights were established a priori using a Delphi consensus process). Analyses followed the intention-to-treat principle. RESULTS: We randomized 291 patients (n=145, aspirin group, and n=146, placebo group). The most frequent surgical procedures were orthopaedic surgery (52.2%), abdominal surgery (20.6%), and urologic surgery (15.5%). No significant difference was observed neither in the primary outcome score [mean values (SD)=0.67 (2.05) in the aspirin group vs 0.65 (2.04) in the placebo group, P=0.94] nor at day 30 in the number of major complications between groups. CONCLUSIONS: In these at-risk patients undergoing elective non-cardiac surgery, we did not find any difference in terms of occurrence of major thrombotic or bleeding events between preoperative maintenance or interruption of aspirin.

Does an educational strategy based on systematic preoperative assessment of simplified Apfel's score decrease postoperative nausea and vomiting?

BACKGROUND AND OBJECTIVE: Postoperative nausea and vomiting (PONV) is a frequent and unpleasant side effect occurring after anaesthesia and surgery. In the present study, we hypothesized that an educational strategy based on systematic preoperative assessment of the simplified Apfel's score decreased the incidence of PONV in a population of adult surgical patients. METHODS: All consecutive patients admitted in the postanaesthesia care unit (PACU) for elective surgery under general anaesthesia were included and PONV occurring in the PACU recorded. An educational strategy consisting in printing the items allowing calculation of the simplified Apfel's score on the records of the preanaesthetic visit, and encouraging anaesthetists to measure and record it was set up. Meetings dedicated to PONV prevention by emphasis on the current guidelines were regularly organized. The primary endpoint was the incidence of PONV occurring in the PACU. RESULTS: One hundred and ninety-one patients were included during the control period (08/01/07 to 28/02/07) and 193 after the educational strategy (01/03/07 to 30/04/07). The incidence of PONV was decreased in the second period from 19.37% to 11.4% (p=0.0340). The rate of administration of intraoperative prophylactic anti-emetics in high-risk groups increased from 36.4% to 52.8% (p=0.049). The prescription rate of anti-emetic prophylaxis correlated with the PONV risk derived from the simplified Apfel's score in the second period of the study (p=0.1415 before, vs. p=0.0005 after). CONCLUSION: An educational strategy based on systematic preoperative measurement and recording of the simplified Apfel's score is efficient to decrease markedly the incidence of PONV in a population of adult surgical patients.

[Inflammation and acute brain injuries in intensive care]. / Inflammation et lésions cérébrales aiguës en anesthésie réanimation.

Patients with acute brain injuries or susceptibility to post-surgery stroke are a major therapeutic challenge for intensive care and anaesthesiology medicine. The control of systemic stress involved in brain damage is necessary to reduce the frequency and severity of secondary brain lesions. Inflammation is known to be directly involved in acute brain lesions. The brain is a major participant in inflammation control through activation or inhibition effects. The exact mechanisms involved in deleterious effects following acute brain injuries due to inflammation are still unknown. This non-exhaustive study will expose the principal processes involved in inflammatory brain disease and explain the consequences of peripheral inflammation for the brain. Neuroprotection strategies in acute neuroinflammation will be reported with a focus on anaesthetic agents and the inflammation cascade.

Effects of the knee-chest position on cardiac index and propofol requirements during bispectral index (BIS)-guided spine surgery.

INTRODUCTION: The knee-chest (KC) position is often used for spine surgery. It is considered to promote significant changes in venous return and cardiac output. However, the magnitude of these changes and their consequences on intraoperative haemodynamics and anaesthetic requirements remain to be determined. The goal of the present study was to determine the changes in cardiac index and propofol requirements of patients undergoing spine surgery in the KC position. METHODS: Twenty ASA 1-3 patients scheduled for elective spine surgery were included in the study. A radial artery catheter and an oesophageal Doppler probe were properly positioned after induction of anaesthesia. Anaesthesia consisted of bispectral index (BIS)-guided, plasma target-controlled, propofol-remifentanil anaesthesia. After positioning the patient KC, remifentanil target concentration was maintained throughout the case as in the supine position whilst propofol target concentration was adjusted to maintain BIS values between 40 and 50. Cardiac index, stroke volume, heart rate, end-tidal CO(2) (ETCO(2)), mean arterial pressure, peak and plateau airway pressures, BIS values and plasma target concentrations of propofol and remifentanil were compared 15 min after induction of anaesthesia (in the supine position) and 15 min after placing the patients KC. Data are expressed as mean+/-S.D. except for DeltaPP expressed as a number of patients with DeltaPP greater than 13%. RESULTS: Cardiac index, stroke volume, mean arterial pressure and propofol target concentration were significantly decreased from supine to KC position: 2.6+/-0.03 to 1.7+/-0.04 l/min/m(2), p<0.0001; 68+/-1.2 to 45+/-1 ml, p<0.0001; 83+/-1.2 to 76+/-1.4 mmHg, p<0.0001 and 3+/-0.06 to 2+/-0.05 microg/ml, p<0.0001, respectively. The number of patients with DeltaPP greater than 13% was zero in the supine position and 18 (90%) in the KC position (p<0.0001). CONCLUSION: Placing surgical patients in the KC position during BIS guided anaesthesia was associated with marked decrease in cardiac index and propofol requirements. These results suggest that monitoring intraoperative cardiac index via an oesophageal Doppler and depth of anaesthesia with the BIS may be useful in patients undergoing spine surgery in the KC position.

Sevoflurane preconditioning at 1 MAC only provides limited protection in patients undergoing coronary artery bypass surgery: a randomized bi-centre trial.

BACKGROUND: Volatile agents can mimic ischaemic preconditioning leading to a decrease in myocardial infarct size. The present study investigated if a 15 min sevoflurane administration before cardiopulmonary bypass (CPB) has a cardioprotective effect in patients undergoing coronary surgery. METHODS: Seventy-two patients were randomized in two centres. The intervention group (S) received 1 MAC sevoflurane administrated via the ventilator for 15 min followed by a 15 min washout before CPB, the control group did not. The primary outcome was the postoperative troponin Ic peak. A biopsy of the atrium was taken during canulation for enzyme dosages. Results are expressed as mean (SD). RESULTS: Neither troponin Ic nor tissular enzyme measurement exhibited any difference between the groups: peak of troponin Ic was 4.4 (5.6) in S group vs 5.2 (6.6) ng ml(-1) in control group (ns). Intratissular ecto-5'-nucleotidase activity was 7.1 (4.3) vs 8.5 (11.9), protein kinase C activity was 27.1 (15.7) vs 29.2 (28.7), tyrosine kinase activity was 101 (54.1) vs 98.5 (63.3), and P38 MAPKinase activity was 131.1 (76.1) vs 127.1 (86.8) nmol mg protein(-1) min(-1) in S group and control group, respectively (ns). However there were fewer patients with low postoperative cardiac index in S group (11% in S vs 35% in control group, P < 0.05) when considering the per protocol population. In S group, 25% of patients required an inotropic support during the postoperative period, vs 36% of patients in control group (ns). CONCLUSIONS: This study did not show a significant preconditioning signal after 15 min of sevoflurane administration. The 15 min duration might be too short or the concentration of sevoflurane too low to induce cardioprotection detected by troponin I levels.

Randomized clinical trial evaluating the need for routine nasogastric decompression after elective hepatic resection.

BACKGROUND: The value of routine nasogastric tube (NGT) decompression after elective hepatic resection has not been investigated. METHODS: Of 200 patients who had elective hepatic resection, including 68 who had previously had colorectal surgery, 100 were randomized to NGT decompression, where the NGT was left in place after surgery until the passage of flatus or stool, and 100 to no decompression, where the NGT was removed at the end of the operation. RESULTS: There was no difference between patients who had NGT decompression and those who did not in terms of overall surgical complications (15.0 versus 19.0 per cent respectively; P = 0.451) medical morbidity (61.0 versus 55.0 per cent; P = 0.391), in-hospital mortality (3.0 versus 2.0 per cent; P = 0.640), duration of ileus (mean(s.d.) 4.3(1.5) versus 4.5(1.7) days; P = 0.400) or length of hospital stay (14.2(8.5) versus 15.8(10.8) days; P = 0.220). Twelve patients randomized to no NGT decompression required reinsertion of the tube 3.9(1.9) days after surgery. Previous abdominal surgery had no influence on the need for NGT reinsertion. Severe discomfort was recorded in 21 patients in the NGT group and premature removal of the tube was required in 19. Pneumonia (13.0 versus 5.0 per cent; P = 0.047) and atelectasis (81 versus 67 per cent; P = 0.043) were significantly more common in the NGT group. CONCLUSION: Routine NGT decompression after elective hepatectomy had no advantages. Its use was associated with an increased risk of pulmonary complications.

Assessment of the cough reflex after propofol anaesthesia for colonoscopy.

BACKGROUND: Dysfunction of the cough reflex as a result of the lingering effects of anaesthetics may lead to aspiration pneumonia or retained secretions after general anaesthesia. It is unknown whether low concentrations of propofol alter the cough reflex in the early period after anaesthesia. The objective of this study was to investigate the effect of low concentrations of propofol on the cough reflex sensitivity as assessed by the cough reflex threshold to an inhaled irritant. METHODS: Fifteen, ASA I-II, non-smoking patients undergoing elective colonoscopy were studied. Anaesthesia was induced and maintained with a blood target-controlled propofol infusion. Cough reflex threshold was measured with citric acid. Increasing concentrations of nebulized citric acid (2.5, 5, 10, 20, 40, 80, 160, 320, and 640 mg ml(-1)) were delivered during inspiration until a cough was evoked. The citric acid concentration eliciting one cough (C1) was defined as the cough reflex threshold. C1 was log transformed for statistical analysis (Log C1). Log C1 was measured before anaesthesia and during the recovery period with estimated decreasing propofol concentrations of 1.2, 0.9, 0.6, and 0.3 microg ml(-1). RESULTS: Log C1 (median; interquartile range) measured with propofol concentrations of 1.2, 0.9, 0.6, 0.3, and 0 microg ml(-1) were 1.9 (0.6), 1.9 (1.0), 1.9 (1.1), 1.9 (0.6), and 1.9 (0.7) mg ml(-1) (NS), respectively. However, light sedation was observed with propofol concentrations of 1.2 and 0.9 microg ml(-1). CONCLUSION: This study indicates that residual sedation after propofol anaesthesia for colonoscopy does not adversely affect the cough reflex.

Thiopental and isoflurane attenuate the decrease in hippocampal phosphorylated Focal Adhesion Kinase (pp125FAK) content induced by oxygen-glucose deprivation.

BACKGROUND: Thiopental and isoflurane exhibit neuroprotective effects against cerebral ischaemia. Here, we hypothesized that oxygen-glucose deprivation decreases the ATP-dependent phosphorylation process of Focal Adhesion Kinase (pp125FAK, a functionally important non-receptor tyrosine kinase), and that this phenomenon is attenuated by thiopental and isoflurane. METHODS: Rathippocampal slices were subjected to an anoxic-aglycaemic (or physiologic, control) challenge followed by 3-h reperfusion, and treated with various concentrations of thiopental and isoflurane. PP125FAK phosphorylation was measured by immunoblotting. Neuronal death was assessed by immunostaining with bis-benzimide. RESULTS: Significant neuronal death was detected after 30 min (but not 10) of anoxia-aglycaemia (40 (4) vs 14 (5)% of control, P<0.05). At 30 min, phosphorylated pp125FAK content was significantly decreased by anoxic glucose-free conditions (55 (27)% of control, P<0.05). This effect was markedly attenuated by thiopental (10 and 100 microM) and isoflurane (1 and 2%). Under control conditions, thiopental (1, 10, and 100 microM) and isoflurane (0.5, 1, and 2%) increased pp125FAK phosphorylation in a concentration-related fashion. This effect was blocked by chelerythrin and bisindolylmaleimide I and IX (10 microM, three structurally distinct inhibitors of protein kinase C, PKC) but not the N-methyl-D-aspartate (NMDA) receptor antagonist MK801 (10 microM). CONCLUSION: Phosphorylated pp125FAK content was markedly decreased in hippocampal slices subjected to oxygen-glucose deprivation. Thiopental and isoflurane significantly attenuated this phenomenon, possibly via PKC activation.

Randomized clinical trial to assess the effect of an educational programme designed to improve nurses' assessment and recording of postoperative pain.

BACKGROUND: The aim of this study was to evaluate the impact of an intervention designed to improve postoperative pain assessment and recording by nurses. METHODS: This cluster randomized clinical trial included two intervals of 3 months each: a preintervention observational study (period 1) followed by a period of intervention (period 2). Six surgical wards were randomly assigned to receive either an experimental intervention, including educational seminars for nurses on pain, pain assessment and the use of a visual analogue scale (n = 3), or standard care (control group; n = 3). The main outcome measures were the percentage of patients in whom pain was assessed, number of pain assessments per patient and postoperative pain intensity scores. RESULTS: A total of 2278 patients were included. Significant improvements were found in the percentage of patients in whom pain was assessed and the number of daily pain assessments per patient in the intervention group between periods 1 and 2. In contrast, these outcomes were unchanged between the two intervals in wards randomized to standard care. During period 2, pain scores at 48 h were significantly decreased in the intervention wards compared with those in the control group. CONCLUSION: An educational programme dedicated to nurses strongly increased the use of regular pain assessment, and may have contributed to a modest improvement in postoperative analgesia.

Comparison between patient-controlled analgesia and subcutaneous morphine in elderly patients after total hip replacement.

BACKGROUND: The goal of this study was to evaluate the effectiveness on postoperative pain, and cognitive impact, of patient-controlled analgesia (PCA) compared with subcutaneous (s.c.) injections of morphine in elderly patients undergoing total hip replacement (THR). METHODS: Forty patients older than 70 yr were randomly assigned to two different postoperative analgesic techniques for 48 h: i.v. PCA morphine (dose, 1 mg; lockout interval, 8 min; PCA group) or regular s.c. morphine injections (SC group). Postoperative pain was assessed at rest and when moving, using a visual analogue scale (VAS) every 4 h. A Mini Mental Status (MMS) examination was used to assess cognitive functions before surgery, at 2 h, 24 h and 48 h after surgery, and at hospital discharge. Side-effects were also recorded systematically during the first 48 h after surgery. RESULTS: The PCA group showed significantly lower pain scores than the SC group both at rest and during mobilization. However, the clinical significance of pain scores was weak. There was no intergroup difference in postoperative MMS scores. The incidence of side-effects was similar in both groups. CONCLUSIONS: We conclude that in healthy elderly subjects undergoing THR, the flexibility of the analgesic regimen is more important than the route of administration with regard to efficacy, adverse effects and recovery of cognitive function.

Daily organ-system failure for diagnosis of persistent intra-abdominal sepsis after postoperative peritonitis.

OBJECTIVE: To evaluate the time-course of two organ failure scores (SOFA and Goris) after surgery for postoperative peritonitis in critically ill patients according to the persistence/nonpersistence of intraabdominal sepsis (IAS). DESIGN: Retrospective study. PATIENTS: Sixty-two consecutive patients (SAPSII = 38+/-14) admitted in the surgical ICU. METHODS: Patients were classified according to the persistence of IAS (IAS+, n=36) confirmed by a second laparotomy or the lack of IAS (IAS-, n=26) assessed by a favorable 30-day evolution without reintervention. Scores were calculated daily from day 0 preoperatively to postoperative day 5. RESULTS: In both groups, SOFA scores were higher on day 1 when compared to day 0 (8.3+/-3.1 vs 6.1+/-3.7 in the IAS+ group and 5.2+/-3.4 vs 2.7+/-2.7 in the IAS- group). In the IAS- patients, the SOFA score displayed a decrease starting on day 2 when compared to day 1 (4.4+/-3.6 vs 5.2+/-3.4, P=0.03). In contrast, in the IAS+ patients, the SOFA score remained unchanged until day 5. The time course of the Goris score was strictly similar to the SOFA scores. CONCLUSION: In critically ill patients with postoperative peritonitis, the postoperative time course of the SOFA and the Goris organ failure scores was different between patients with or without intra-abdominal persistent sepsis. The lack of improvement of one of these scores on postoperative day 2 may suggest persistent intraabdominal sepsis and supports the need for a new surgical exploration.

Predictive factors of early morphine requirements in the post-anaesthesia care unit (PACU).

Use of morphine by titration in the post-anaesthesia care unit (PACU) is often the first step in postoperative pain management. This approach provides rapid analgesia but shows a wide inter-individual variability in morphine requirements and may prolong patient stay in the PACU. The aim of this study was to identify the patient characteristics, surgical, anaesthetic, and postoperative factors predictive of early morphine requirements. The study included 149 patients undergoing various non-cardiac surgical procedures under general anaesthesia. In the multiple regression analysis of nine variables, only ethnicity (Caucasian), emergency surgery, major surgery, surgery exceeding 100 min, and pain score on arrival in PACU were predictive factors of morphine requirements. This observational study identifies for the first time independent predictive factors of morphine requirements in the early postoperative period. Future studies are warranted to evaluate the impact of intervention on these factors and any resulting improvement in postoperative pain treatment.

The pharmacokinetics of cisatracurium in patients with acute respiratory distress syndrome.

UNLABELLED: Continuous neuromuscular blockade is often necessary in patients being treated for acute respiratory distress syndrome (ARDS) to optimize oxygenation. In this study, neuromuscular blockade (no response to two responses at the train-of-four stimulation at the orbicularis oculi muscle) was achieved in six patients with ARDS by a continuous infusion of cisatracurium. The plasma concentration of cisatracurium during the infusion averaged 1.00 (0.25-1.45) microg/mL, expressed as median (range). The clearance and half-life were 6.5 (3.3-7.6) mL. min(-1). kg(-1) and 25 (16-48) min, respectively. The laudanosine plasma concentrations were 0.70 (0.12-1.20) microg/mL. The pharmacokinetic variables of cisatracurium are similar to those of patients without organ failure undergoing elective surgery. Plasma laudanosine levels always remained well less that those associated with seizure activity in animal models. Long-term infusion of cisatracurium was not associated with any side effects. Cisatracurium is a suitable muscle relaxant when deep and continuous levels of muscle relaxation are required in patients treated for ARDS. IMPLICATIONS: We studied the pharmacokinetics of cisatracurium in six patients treated for respiratory distress syndrome by continuous muscle relaxation. A deep degree of neuromuscular blockade corresponding to abolition of two responses at the orbicularis oculi to train-of-four stimulation was obtained in all patients. The pharmacokinetic variables observed in these severely ill patients were similar to those of anesthetized patients. No accumulation of laudanosine was seen. Cisatracurium appears to be suitable when continuous muscle relaxation is required in critically ill patients.