Residual Paralysis in the PACU after a Single Intubating Dose of Nondepolarizing Muscle Relaxant with an Intermediate Duration of Action

Background: Residual neuromuscular blockade remains a problem even after short surgical procedures. The train-of-four (TOF) ratio at the adductor pollicis required to avoid residual paralysis is now considered to be at least 0.9. The incidence of residual paralysis using this new threshold is not known, especially after a single intubating dose of intermediate-duration nondepolarizing relaxant. Therefore, the aim of the study was to determine the incidence of residual paralysis in the postanesthesia care unit after a single intubating dose of twice the ED95 of a nondepolarizing muscle relaxant with an intermediate duration of action.

Methods: Five hundred twenty-six patients were enrolled. They received a single dose of vecuronium, rocuronium, or atracurium to facilitate tracheal intubation and received no more relaxant thereafter. Neuromuscular blockade was not reversed at the end of the procedure. On arrival in the postanesthesia care unit, the TOF ratio was measured at the adductor pollicis, using acceleromyography. Head lift, tongue depressor test, and manual assessment of TOF and DBS fade were also performed. The time delay between the injection of muscle relaxant and quantitative measurement of neuromuscular blockade was calculated from computerized anesthetic records.

Results: The TOF ratios less than 0.7 and 0.9 were observed in 16% and 45% of the patients, respectively. Two hundred thirty-nine patients were tested 2 h or more after the administration of the muscle relaxant. Ten percent of these patients had a TOF ratio less than 0.7, and 37% had a TOF ratio less than 0.9. Clinical tests (head lift and tongue depressor) and manual assessment of fade showed a poor sensitivity (11-14%) to detect residual blockade (TOF < 0.9).     

Influence of Vancomycin Infusion Methods on Endothelial Cell Toxicity

Peripheral intravenous therapy is frequently used in routine hospital practice and, due to various factors, its most common side effect is phlebitis. The infusion of vancomycin is particularly associated with phlebitis despite its widespread use. French guidelines recommend central intravenous infusion for high concentrations of vancomycin, but peripheral intravenous therapy is often preferred in intensive care units. Methods of vancomycin infusion are either intermittent infusion or continuous infusion. A comparison of these methods under in vitro conditions simulating clinical use could result in better infusion efficacy. Human umbilical vein endothelial cells (HUVECs) were therefore challenged with clinical doses of vancomycin over a 24- to 72-h period using these infusion methods. Cell death was measured with the alamarBlue test. Concentration-dependent and time-dependent vancomycin toxicity on HUVECs was noted with a 50% lethal dose at 5 mg/ml after 24 h, reaching 2.5 mg/ml after 72 h of infusion, simulating long-term infusion. This toxicity does not seem to be induced by acidic pH. In comparing infusion methods, we observed that continuous infusion induced greater cell toxicity than intermittent infusion at doses higher than 1 g/day. The increasing use of vancomycin means that new guidelines are required to avoid phlebitis. If peripheral intravenous therapy is used to reduce infusion time, along with intermittent infusion, vein irritation and localized phlebitis may be reduced. Further studies have to be carried out to explore the causes of vancomycin endothelial toxicity.     

Rapacuronium 2.0 or 2.5 mg kg-1 for rapid-sequence induction: comparison with succinylcholine 1.0 mg kg-1

The purpose of this nine-centre study in 602 patients was toshow that the frequency of acceptable intubating conditionsafter rapacuronium 2.0 or 2.5 mg kg^–1 is notmore than 10% lower than the frequency after succinylcholine1.0 mg kg^–1 during rapid-sequence inductionof anaesthesia with fentanyl 1–2 µg kg^–1and thiopental 2–7 mg kg^–1. Laryngoscopyand intubation were carried out 60 s after administrationof muscle relaxant by an anaesthetist blinded to its identity.Intubating conditions were clinically acceptable (excellentor good) in 91.8% of patients given succinylcholine and in 84.1and 87.6% of patients given rapacuronium 2.0 and 2.5 mg kg^–1respectively. With respect to the percentage of clinically acceptableintubating conditions, the estimated difference (and the upperlimit of the one-sided 97.5% confidence interval) between succinylcholineand rapacuronium 2.0 mg kg^–1 was 7.8 (14.4)%and between succinylcholine and rapacuronium 2.5 mg kg^–1it was 4.0 (10.2)%. For both comparisons, the upper limit ofthe one-sided confidence interval exceeded the predefined 10%difference. Hence, it could not be demonstrated that the intubatingconditions with either of the two doses of rapacuronium werenot inferior to those with succinylcholine 1.0 mg kg^–1.The increase in heart rate was significantly greater duringthe first 5 min in the rapacuronium groups, but the arterialpressure increased significantly only in the succinylcholinegroup (P<0.001). Respiratory side-effects were observed in4.0, 13.5 and 18.5% of patients after succinylcholine and rapacuronium2.0 and 2.5 mg kg^–1 respectively (P<0.05).As the non-inferiority of intubating conditions after rapacuronium2.0 and 2.5 mg kg^–1 could not be proven, succinylcholineshould be considered the neuromuscular blocking agent that providesbetter intubating conditions for rapid-sequence induction. Br J Anaesth 2000; 85: 724–31 ^* Corresponding author: Klinik für Anaesthesiologie der TechnischenUniversität München, Klinikum rechts der Isar, IsmaningerStr. 22, D-81675 München, Germany     

Catheter-related infection in intensive care. Physiopathology, diagnosis, treatment and prevention

PURPOSE: To review the mechanisms, diagnosis, treatment and prophylaxis of catheter-related sepsis in intensive care unit patients. DATA SOURCES: A Medline research of the English- or French-language reports published between 1966 and 2000 and a manual research of references of relevant papers. STUDY SELECTION: Experimental, clinical and basic research studies related to catheter-related sepsis. DATA EXTRACTION: Data in selected articles were reviewed, and relevant clinical information was extracted. DATA SYNTHESIS: Infection remains the major complication related to catheter insertion. No bacteriological exam or systematic catheter change is required in the absence of infection suspicion. In the intensive care unit, and without septic shock, the surveillance of skin cultures at the catheter insertion site or the time to positivity of hub-blood versus peripheral-blood culture determination may reduce the number of unnecessary removed catheters. Catheter change over a guidewire is not recommended because of the risk of dissemination of infection. When the catheter is removed, a quantitative culture is warranted. The treatment of catheter-related sepsis is based on catheter removal. The use of antibiotics is limited to some organisms or when the infection is complicated. The persistence of fever and positive blood cultures 72 h after catheter removal require to look for dissemination of infection or septic thrombophlebitis, especially if S. aureus or Candida are incriminated. The treatment of infection without catheter removal is not recommended in the intensive care unit because of a high risk of treatment failure. Compliance with catheter care guidelines and continuing quality improvement programs are the two major procedures in reducing catheter infection. CONCLUSIONS: Improved understanding of the pathophysiology of catheter-related sepsis has led to improved prevention. Compliance with catheter care guidelines and continuing quality improvement programs are majors procedures to reduce the risk of catheter infection.     

Does the risk of compressive hematoma after thyroidectomy authorize 1-day surgery?

BACKGROUND: Compressive hematoma after thyroidectomy is a rare complication (1%) but can potentially be severe. The aim of this study was to search for risk factors, in particular the use of anticoagulants or antiplatelet medication, and to see if the delay of hematoma formation would require 1-day surgery performed in a careful manner. MATERIALS AND METHODS: Retrospective review of 6,830 patients undergoing thyroidectomy in a single institution (1991 to 2006) identified 70 patients with hematomas requiring reoperation. Case controls (210 patients) were matched for age, gender, year of operation, type of thyroid disease, and type of operation. The notion of anticoagulant or antiplatelet medication was particularly studied. The delay of hematoma formation and the cause of bleeding were studied in univariate analysis by a chi-squared test and a Fischer's test. RESULTS: In univariate analysis, the formation of hematoma is not related to age, gender, type of thyroid disease, or type of bleeding. The pre or intraoperatory administration of anticoagulant or antiplatelet medication did not influence hematoma formation. Thirty-seven hematomas (53%) presented within 6 h postoperatively, 26 (37%) between 7 and 24 h and seven (10%) beyond 24 h. CONCLUSION: Patients undergoing anticoagulant or antiplatelet treatment are not a high-risk population for hematoma formation. Forty-seven percent of the patients presented postoperative hematomas beyond 6 h postoperatively, leading to the conclusion that 1-day surgery is not safe.     

Help,I’m losing patient‐centredness! Experiences of medical students and their teachers

Medical Education 2010: 44 : 662–673 Objectives Despite all educational efforts, the literature shows an ongoing decline in patient‐centredness during medical education. This study explores the experiences of medical students and their teachers and supervisors in relation to patient‐centredness in order to gain a better understanding of the factors that determine its development. Methods We conducted 11 focus groups on the subject of learning and teaching about patient‐centredness. We then carried out a constant comparative analysis of prior theory and the qualitative data collected in the focus groups using the ‘sensitising concepts’ provided by the Attitude–Social Influence–Self‐Efficacy (ASE) model. Results Although students express positive attitudes towards patient‐centredness and acquire patient‐centred skills during medical education, this study indicates that these are not sufficient to attain the level of competent behaviour needed in today’s challenging hospital environment. Clinical clerkships do provide students with ample opportunity to encounter patients and practise patient‐centred skills. However, when students lack self‐efficacy, when they face barriers (time pressure, tiredness) or when they are surrounded by non‐patient‐centred role models and are overwhelmed by powerful experiences, they lose their patient‐centred focus. The study suggests that communication skills training protects students from negative social influences. Moreover, personal development, including developing the ability to deal with emotions and personal suffering, self‐awareness and self‐care are important qualities of the central phenomenon of the ‘doctor‐as‐person’, which is identified as a missing concept in the ASE model. The student–supervisor relationship is found to be key to learning patient‐centredness and has several functions: it facilitates the direct transmission of patient‐centred skills, knowledge and attitudes; it provides social support of students’ patient‐centred behaviour; it provides support of the ‘student‐as‐person’; it mirrors patient‐centredness by being student‐centred, and, lastly, it addresses supervisor vulnerability. Finally, participants recommend that student‐centred education and guidance be offered, self‐awareness be fostered and more opportunities to encounter patients be created, including more time in general practice. Conclusions Supportive student–doctor relationships, student‐centred education and guidance that addresses the needs of the doctor‐as‐person are central to the development of patient‐centredness. Medical education requires patient‐centred, self‐caring and self‐aware role models.     

Physico-chemical stability and sterility of non-opioid analgesics in solution

Objectives

The combination of non-opioid analgesic drugs (P: paracetamol, K: ketoprofen and N: nefopam) is currently recommended for postoperative pain control. In practice, these analgesics are often administered in the same solution. We investigated the chemical stability and sterility of three mixtures of analgesics (P + K, P + N and K + N).

Methods

For each mixture, concentrations of active principles were measured using high-performance liquid chromatography over 24 hours. These mixtures were cultured for microbiological colonization.

Results

Our study demonstrated chemical and bacteriologic stability of these three mixtures over a 24-hour period. The results allow the use of P + K, P + N and K + N in the same ready to use solution.