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Canadian Journal of Anesthesia, Vol 39, 179-183, Copyright © 1992 by Canadian Anesthesiologists' Society
ARTICLES |
LA Fleisher, AH Nelson and SH Rosenbaum
Department of Anesthesiology, Yale University School of Medicine, Yale New Haven Hospital, CT 06510.
Three cases of postoperative myocardial infarction are reported in patients with normal or fixed defects on preoperative dipyridamole thallium scans (interpreted as "negative" for active cardiac ischaemic risk). All patients were monitored with an ambulatory electrocardiographic recorder from the evening before surgery through the first two postoperative days. Two of the patients demonstrated preoperative or early postoperative ischaemia, suggesting that the test was a false negative. The third patient did not demonstrate ischaemia during the period of monitoring, but developed a myocardial infarction during the third postoperative day, suggesting progression of the underlying coronary artery disease. Preoperative dipyridamole thallium imaging may result in false negative scans in selected high-risk populations.
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