Articles: general-anesthesia.
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The anaesthetist giving anaesthesia for the surgical removal of cerebral aneurysms faces a great variety of tasks. Experience gained in the course of 61 such operations has shown that a combination of controlled hypotension, careful monitoring of the function of the autonomic nervous system and a meticulous surgical technique with the aid of a microscope produces satisfactory results.
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Caesarean sections were performed on 18 Romney ewes on day 144 of pregnancy. Anaesthesia was induced in 9 ewes with CT 1341 and in 9 ewes with thiopentone and maintained in both groups with halothane administered with oxygen. Surgery was performed with the ewes in lateral recumbency, with respiration unassisted. ⋯ Significant linear relationships were only found in the CT 1341 group between TSR interval and PCO2 and pH. No significant correlations were found between the lD interval and any of the biochemical characteristics. The results of this study suggest that lateral recumbency does not interfere with uteroplacental circulation, that CT 1341 (2.2 mg/kg) is associated with less neonatal depression than thiopentone (10 mg/kg) and that severe neonatal hypercarbia may delay the onset of respiration in lambs with minimal drug depression.