Anaesthesia and intensive care
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Anaesth Intensive Care · Apr 1999
Physiological deadspace during normocapnic ventilation under anaesthesia.
Respiratory physiological deadspace (VDphys) during normocapnic ventilation under anaesthesia was studied in 253 patients scheduled for elective non-thoracic surgery. Subjects were ventilated with SERVO 900B ventilator using CO2 analyser 930 (Siemens-Elema Sweden) to adjust minute volume sufficient to maintain end-tidal carbon dioxide fraction (FECO2) around 5.5kPa with normocapnic confirmation using arterial blood gas analysis. VDphys was calculated using Enghoff's modification of Bohr's equation. ⋯ Males had significantly higher VDphys/mass (2.5 +/- 0.68 ml.kg) compared with females (2.2 +/- 0.54 ml/kg, P < 0.001) but significantly lower body mass index (BMI) (20.67 +/- 3.2 in males and 22.47 +/- 4.1 in females, P < 0.001). VDphys showed positive correlation with weight, height and body surface area (BSA) but VDphys/kg showed negative correlation with BMI. Multiple regression analysis produced a best fit equation for VDphys = 9.7 + 64.3 x BSA + 13.51S where S = 1 for females and 2 for males.
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Anaesth Intensive Care · Apr 1999
Validation of Tu's cardiac surgical risk prediction index in a Western Australian population.
Tu's cardiac surgical risk prediction index for a Western Australian population was examined in a prospective observational cohort study. Risk score and outcome data were collected for 367 consecutive patients. Logistic regression analysis for Tu score prediction of hospital mortality and linear regression analysis for prediction of ICU and hospital stays were performed. ⋯ The linear regression analyses of Tu score on ICU and hospital stays showed an excellent fit (P = 0.0001). The area under the receiver-operating characteristic curve for prolonged ICU stay was 0.75. The Tu risk index is valid for a Western Australian cardiac surgical population and practice.
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Anaesth Intensive Care · Apr 1999
Biography Historical ArticleThe Coxeter Boyle Gas Anaesthesia Apparatus.
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Anaesth Intensive Care · Feb 1999
Comment Letter Biography Historical ArticleThe Marrett apparatus.
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Anaesth Intensive Care · Feb 1999
Review Case ReportsSurgical emphysema following percutaneous tracheostomy.
We report two patients in whom a Portex GWDFT was complicated by surgical emphysema. Subsequent examination revealed posterior tracheal wall tears in these patients. The exact aetiology of these tears is unknown, although the tracheostomy tube introducer may have been implicated. We suggest a management plan for this complication.