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BJA Advance Access originally published online on June 25, 2004
British Journal of Anaesthesia 2004 93(3):343-347; doi:10.1093/bja/aeh206
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© The Board of Management and Trustees of the British Journal of Anaesthesia 2004

Moderate hypothermia for 359 operations to clip cerebral aneurysms

P. Kimme1,*, S. Fridrikssen2, O. Engdahl1, J. Hillman2, M. Vegfors1 and F. Sjöberg1

1 Department of Anaesthesiology and Intensive Care and 2 Department of Neurosurgery, Faculty of Health Sciences, University Hospital, S-581 85 Linköping, Sweden

* Corresponding author. E-mail: Peter.Kimme{at}lio.se

Background. Experimental data have suggested that hypothermia (32–34°C) may improve outcome after cerebral ischaemia, but its efficacy has not yet been established conclusively in humans. In this study we examined the feasibility and safety of deliberate moderate perioperative hypothermia during operations for subarachnoid aneurysms.

Methods. A total of 359 operations for intracranial cerebral aneurysms were included in this prospective study. By using cold intravenous infusions (4°C) and convective cooling our aim was to reduce the patient's core temperature to more than 34°C within 1 h before operation. The protocol assessed postoperative complications such as infections, prolonged mechanical ventilation, pulmonary complications and coagulopathies.

Results. During surgery, the body temperature was reduced to a mean of 32.5 (SD 0.4) °C. Cooling was accomplished at a rate of 4.0 (SD 0.4) °C h–1. All patients were normothermic at 5 (SD 2) h postoperatively. Peri/postoperative complications included circulatory instability (n=36, 10%), arrhythmias (n=17, 5%) coagulation abnormalities and blood transfusion (n=169, 47%), infections (n=29, 8%) and pulmonary complications (infiltrate or oedema while on ventilatory support) (n=97, 27%). Eighteen patients died within 30 days (5%). There was no significant correlation between the extent of hypothermia and any of the complications. However, there was a strong correlation between the occurrence of complications and the severity of the underlying neurological disease as assessed by the Hunt and Hess score.

Conclusion. Moderate hypothermia accomplished within 1 h of induction of anaesthesia and maintained during surgery for subarachnoid aneurysms appears to be a safe method as far as the risks of peri/postoperative complications such as circulatory instability, coagulation abnormalities and infections are concerned.


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Moderate hypothermia for 359 operations to clip cerebral aneurysms
Arpan Guha, et al.
British Journal of Anaesthesia, 22 Mar 2005 [Full text]
Reply to Drs Guha, Lakhani and Whitehead
peter kimme, et al.
British Journal of Anaesthesia, 22 Mar 2005 [Full text]

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