Anaesthesia and intensive care
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Anaesth Intensive Care · Dec 1993
Randomized Controlled Trial Clinical TrialArterial desaturation during induction with and without preoxygenation: evaluation of four techniques.
The incidence and degree of hypoxaemia during induction of balanced anaesthesia and endotracheal intubation were studied prospectively in 80 healthy adults undergoing elective surgery randomly divided into four equal groups of 20. Group 1 was preoxygenated for three minutes. The other three groups were not preoxygenated. ⋯ Two patients in Group 3 and four in Group 4 had hypoxaemia. This incidence was not statistically significant. We conclude that ventilation with 100% oxygen for one minute prior to intubation and preoxygenation for three minutes are equally effective in preventing hypoxaemia during induction.
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Anaesth Intensive Care · Dec 1993
Randomized Controlled Trial Clinical TrialThe effects of providing preoperative statistical anaesthetic-risk information.
Are patients who are provided with details about anaesthesia risks on the eve of surgery better informed, and does the information increase their anxiety? Forty (ASA Class I or II) patients scheduled for surgery requiring general anaesthesia were randomly allocated to either a routine or a detailed information group. Levels of anxiety were assessed by the Spielberger State-Trait Anxiety Inventory. Actual knowledge of risks was assessed by a special visual analogue scale. ⋯ The detailed group, however, had gained more accurate knowledge of the likelihood of two rare complications, death (P < 0.001) and serious tooth damage (P < 0.05). Notwithstanding, there was no difference between the groups in anxiety. Thus, provision of detailed information about the risks of the complications of general anaesthesia did increase patients' knowledge but did not increase patients' levels of anxiety.
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Anaesth Intensive Care · Dec 1993
Comparative Study Clinical TrialTidal volume, lung hyperinflation and arterial oxygenation during general anaesthesia.
Impaired pulmonary oxygen (O2) exchange is common during general anaesthesia but there is no clinical unanimity as to methods of prevention or treatment. We studied 14 patients at risk for pulmonary dysfunction because of increased age, obesity, cigarette smoking, or chronic lung disease. Pulmonary O2 exchange was measured during four conditions of ventilation: awake spontaneous, conventional tidal volume (CVT, 7 ml.kg-1) or high tidal volume (HVT, 12 ml.kg-1) controlled ventilation, and five min after manual hyperinflation (HI) of the lungs. ⋯ Using a multivariate model to predict O2 exchange, obesity and type of surgery were significantly associated with worsening, while level of VT and inspiratory gas (N2O or N2) were not significant predictors. Thus patient and surgical factors were more important determinants of pulmonary gas exchange during anaesthesia than were tidal volume or inspiratory gas. Manual HI is a simple and effective manoeuvre to improve gas exchange.
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Outcome has been measured for 6000 consecutive procedures in a major public teaching hospital day surgery unit. The unanticipated hospital admission rate was 1.34% and surgery-related admissions (0.95%) exceeded those related to anaesthesia (0.13%). Perioperative complications related to surgery (1:105) were more frequent than those related to anaesthesia (1:176) and pre-existing medical problems (1:500). ⋯ At early follow-up, 4.0% of patients had presented to a local medical practitioner and 3.1% to a hospital accident and emergency service, usually for minor problems. Take home analgesia was adequate for 95% of patients and 98.9% were happy with the day surgery service. Day surgery in a teaching hospital can provide satisfactory outcome, with low complication rates, high patient acceptance and low community support requirements after patient discharge.
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Anaesth Intensive Care · Dec 1993
Anaesthesia in rural Queensland: clinical experience with the Flying Obstetric and Gynaecology Service.
The Flying Obstetric and Gynaecology (FOG) service visits 27 outback towns scattered over approximately one million square kilometers of western Queensland. The role and workload of an anaesthetist attached to the FOG Service and a prospective audit of 760 consecutive anaesthetics over a ten-month period are reported. ⋯ This ensures that deficiencies in anaesthetic related areas are identified and appropriate action taken. The challenge to rural practitioners must be to provide a service, of at least an equivalent standard to that of their metropolitan counterparts.