Peri-operative anaesthetic management of cytoreductive surgery with hyperthermic intraperitoneal chemotherapy.

Cytoreductive surgery with hyperthermic intraperitoneal chemotherapy (HIPEC) is a long and complex procedure with significant blood and fluid loss during debulking and important pathophysiological alterations during the HIPEC phase. We performed a retrospective analysis of 78 consecutive patients undergoing cytoreductive surgery with HIPEC at a university hospital. Our data demonstrate large intra-operative fluid turnover, with 51% of patients requiring a blood transfusion. During HIPEC, airway pressure and central venous pressure increased with a lower oxygenation ratio as a result of increased intra-abdominal pressure with the closed abdomen technique. As a consequence of the raised body temperature, heart rate, end tidal carbon dioxide and arterial lactate levels increased with a slight metabolic acidosis. Peri-operative analysis of routine clotting parameters revealed disturbances of the coagulation status. For pain management, 72% of patients received supplementary thoracic epidural analgesia with consequential peri-operative opioid sparing and a reduced duration of postoperative ventilation.

Perioperative changes in cardiac autonomic control in patients receiving either general or local anesthesia for ophthalmic surgery.

To investigate whether local (LA) or general anesthesia (GA) provides more perioperative stability in cardiac autonomic tone, we analyzed heart rate variability (HRV) by means of spectral analysis, intraoperatively and up to 3 h postoperatively, in otherwise healthy patients scheduled for cataract surgery. Fourteen patients received GA (premedication: clorazepate; anesthetic induction: propofol, alfentanil, atracurium; anesthetic maintainance: isoflurane, alfentanil; airway management: laryngeal mask airway), and 14 patients received LA (retrobulbar block with bupivacaine/mepivacaine). In the GA group, total power, as an indicator of cardiac autonomic activity, was significantly reduced intraoperatively and increased slowly during the postoperative period. The ratio of low frequency/high frequency (LF/HF) power, indicating cardiac sympathovagal balance, did not change significantly intraoperatively and remained stable in the postoperative period. The LA group showed no significant changes in total power intraoperatively. Postoperatively, heart rate and the LF/HF power ratio were significantly increased in the LA group compared to the GA group. GA as described above was associated with intra- or postoperative stability of the cardiac sympathovagal balance. Thus GA had no disadvantageous effects on the perioperative cardiac autonomic tone during ophthalmic surgical procedures compared to LA in otherwise healthy patients.