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  • Title: Haemodynamic changes during sodium nitroprusside induced hypotension and halothane/nitrous oxide anaesthesia.
    Author: Beierholm EA, Bredgaard Sørensen M, Sroczynski Z, Spotoft H, Gøthgen I, Thorshauge C.
    Journal: Acta Anaesthesiol Scand; 1983 Apr; 27(2):99-103. PubMed ID: 6837256.
    Abstract:
    The haemodynamic effects of nitroprusside (SNP) were studied in six patients undergoing surgery for intracranial aneurysm under controlled hypotension in endotracheal anaesthesia with halothane-nitrous oxide during hypocapnia. Mean arterial pressure was reduced with SNP from mean 12.25 kPa to mean 8.29 kPa (32%). There were concomitant statistically significant decreases in systemic vascular resistance (-21%), cardiac index (-17%), stroke index (-23%), pulmonary arterial mean pressure (-27%) and pulmonary capillary wedge pressure (-27%). Heart rate, central venous pressure and pulmonary vascular resistance did not change significantly. After the infusion of SNP was discontinued all parameters, except cardiac index and heart rate, returned to values not significantly different from the control values. The hypotension induced by SNP resulted from reductions in cardiac index and systemic vascular resistance. The reduction in cardiac index did not reach a critical level in any of the patients.
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