Anaesthesia
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Randomized Controlled Trial
The effect of intra-operative passive movement therapy on non-surgical site pain after breast reconstructive surgery: a preliminary study.
Pain distant to an operative site is under-reported but sometimes more severe than pain from the surgical site. Intra-operative passive movement could possibly reduce this pain. This preliminary study was designed to assess the practicalities of conducting a randomised controlled trial of this therapy in anaesthetised patients. ⋯ Forty-two patients undergoing breast reconstruction were randomly assigned to receive either intra-operative passive movement or standard care. Twenty-four hours after surgery, median (IQR [range]) morphine consumption was 33 (11-42 [0-176]) mg in the passive movement group compared with 74 (15-118 [0-238]) mg with standard care (p = 0.126), while participants reported median (IQR [range]) visual analogue scores in areas distant from the surgical site of 0 (0-4 [0-34]) mm in the passive movement group compared with 10 (2-30 [0-57]) mm in those receiving standard care (p = 0.002). A full trial of intra-operative passive movement therapy to reduce postoperative is feasible and warranted.
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A relatively new minimally invasive cardiological procedure, called the MitraClip(™), does not require sternotomy and may have a number of advantages compared with open mitral valve surgery, but its acute impact on the pulmonary circulation and right ventricular function during general anaesthesia is unclear. We prospectively assessed the effects of the MitraClip procedure in 81 patients with or without pulmonary hypertension (defined as mean pulmonary artery pressure > 25 mmHg), who were anaesthetised using fentanyl (5 μg.kg(-1)), etomidate (0.2-0.3 mg.kg(-1)), rocuronium (0.5-0.6 mg.kg(-1)) and isoflurane. ⋯ Patients with pulmonary hypertension experienced a similar decrease in mean pulmonary artery pressure compared with those without, and they also had a slight reduction in mean (SD) pulmonary artery occlusion pressure (22 (6) down to 20 (6) mmHg, p = 0.044). We conclude that successful MitraClip treatment for mitral regurgitation acutely improves right ventricular performance by reducing right ventricular afterload, regardless of whether patients have pre-operative pulmonary hypertension.
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We investigated whether laparoscopic vs open surgical approaches affected the duration of neuromuscular blockade following a single bolus dose of rocuronium. Fifty-three female patients underwent either laparoscopic or open gynaecological surgery. ⋯ Changes in liver function both before surgery and at 24 h postoperatively were similar between the two groups (p > 0.05). Our findings suggest that neuromuscular blockade may be prolonged following a single bolus dose of rocuronium given during laparoscopic procedures.
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Anatomical, neurological and behavioural research has suggested differences between the brains of right- and non-right-handed individuals, including differences in brain structure, electroencephalogram patterns, explicit memory and sleep architecture. Some studies have also found decreased longevity in left-handed individuals. We therefore aimed to determine whether handedness independently affects the relationship between volatile anaesthetic concentration and the bispectral index, the incidence of definite or possible intra-operative awareness with explicit recall, or postoperative mortality. ⋯ There were 4992 (89.4%) right-handed and 593 (10.6%) non-right-handed patients. Handedness was not associated with (a) an alteration in anaesthetic sensitivity in terms of the relationship between the bispectral index and volatile anaesthetic concentration (estimated effect on the regression relationship -0.52 parallel shift; 95% CI -1.27 to 0.23, p = 0.17); (b) the incidence of intra-operative awareness with 26/4992 (0.52%) right-handed vs 1/593 (0.17%) non-right-handed (difference = 0.35%; 95% CI -0.45 to 0.63%; p = 0.35); or (c) postoperative mortality rates (90-day relative risk for non-right-handedness 1.19, 95% CI 0.76-1.86; p = 0.45). Thus, no change in anaesthetic management is indicated for non-right-handed patients.
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Thromboelastography is used for assessment of coagulation and to guide administration of blood products peri-operatively. There is currently no method of standardisation in the UK, nor an approved method of proving quality. We investigated the reproducibility of thromboelastography by testing whole blood with no coagulation abnormality in three phases. ⋯ Further examination of the results indicated less variation where analysis was performed on blood taken from the same kaolin vial compared with results from different vials. Our preliminary study indicates that R- and K-times may be highly variable, which we hypothesise may be due to variable mixing of blood and kaolin. We intend to repeat this study in the context of coagulopathy, where variability in results could potentially impact upon transfusion practice.