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J Thorac Cardiovasc Surg 1994;108:969-974
© 1994 Mosby, Inc.

CARDIOPULMONARY BYPASS, MYOCARDIAL MANAGEMENT, AND SUPPORT TECHNIQUES

Protection of the brain by retrograde cerebral perfusion during circulatory arrest

Taipei, Taiwan, Republic of China

Received for publication Jan. 27, 1994. Accepted for publication May 31, 1994. Address for reprints: Pyng Jing Lin, MD, Division of Thoracic and Cardiovascular Surgery, Chang Gung Memorial Hospital, 199, Tun-Hwa North Rd., Taipei, Taiwan, Republic of China.

Abstract

Hypothermic circulatory arrest is commonly used to facilitate repair of complex congenital heart defects and aortic lesions and for complex neurosurgical procedures. However, extended periods of circulatory arrest may impair cerebral metabolism and cause ischemic injury. Retrograde cerebral perfusion has been applied recently in aortic surgery to protect the brain. From January 1991 to December 1993, 29 patients underwent emergency operations to repair acute type A aortic dissection with the aid of hypothermic circulatory arrest. Six patients received hypothermic circulatory arrest without retrograde cerebral perfusion with a rectal temperature of 16.4° ± 0.9° C (mean ± standard error of the mean, group 1). Retrograde cerebral perfusion during hypothermic circulatory arrest was performed in 15 patients with a rectal temperature of 15.9° ± 0.5° C (group 2) and in eight patients with a rectal temperature of 21.7° ± 0.8° C (group 3). The hypothermic circulatory arrest times were 25 ± 4, 42 ± 4, and 63 ± 6 minutes, respectively (p < 0.05). The cardiopulmonary bypass times were 173 ± 5, 184 ± 7, and 143 ± 6 minutes, respectively (p < 0.05). All patients survived the operation and regained consciousness with no neurologic defects. Follow-up (mean 23.2, 14.5, and 5.1 months, respectively) was complete in all patients except one. This patient, from group 2, was killed in a road traffic accident 12 months after the operation. Our experience suggests that retrograde cerebral perfusion can effectively protect the brain from ischemic injury and extend the safe period of hypothermic circulatory arrest. With the aid of retrograde cerebral perfusion, prolonged circulatory arrest can probably be performed safely with moderate hypothermia. (J THORACCARDIOVASCSURG1994;108:969-74)

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