• Yuichi Echigoya and Hirokatsu Kato.
• Department of Anesthesia, Shinnittetsu Muroran General Hospital, Muroran 050-0072.
• Masui. 2007 Aug 1;56(8):932-6.

BackgroundThere are many causes for postoperative delirium in elderly patients. Hypotension is considered as one of the causes. In our retrospective study, hypotension during operation was not taken care of strictly. Slight hypotension was observed every so often. We recognized that the drop of cerebral blood flow due to hypotension and duration of hypotension were risk factors of postoperative delirium.MethodsWe did a retrospective study, covering the period between April 1, 2005 and March 31, 2006, in 30 elderly patients for elective laparotomy. We compared postoperative delirium group (D group) with no delirium group (ND group).ResultsThere were great differences in transfusion, fluid infusion, anesthesia time, operation time, blood loss, extreme hypotension and the duration of hypotension between the two groups.ConclusionsOur results indicate that permissive hypotension induced the drop of cerebral blood flow and it can be a risk factor of postoperative delirium in elderly patients. To prevent extreme hypotension, to decrease duration of hypotension, and to raise the blood pressure quickly are very important to decrease postoperative delirium in elderly patients.

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