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Eur J Cardiothorac Surg 2000;18:270-275
© 2000 Elsevier Science NL

Normothermic cardiopulmonary bypass is beneficial for cognitive brain function after coronary artery bypass grafting – a prospective randomized trial

^a Department of Cardiothoracic Surgery, University of Vienna, Währinger Gürtel 18-20 A-1090 Vienna, Austria
^b IVth Department of Internal Medicine, University of Vienna, Währinger Gürtel 18-20 A-1090 Vienna, Austria
^c Department of Cardiothoracic and Vascular Anesthesia and Intensive Medicine, University of Vienna, Währinger Gürtel 18-20 A-1090 Vienna, Austria

Received 6 October 1999; received in revised form 22 May 2000; accepted 31 May 2000.

Corresponding author. Tel.: +43-1-40400-5262; fax: +43-1-40400-5642
e-mail: michael.grimm{at}akh-wien.ac.at

Background: Hypothermic and normothermic cardiopulmonary bypass (CPB) have resulted in apparently contradictionary cardiac and neurologic outcome. Cerebrovascular risk and cognitive dysfunction associated with normothermic CPB still remain uncertain. Materials and methods: In a prospective randomized study, we measured the effects of mildly hypothermic (32°C, n=72) vs. normothermic (37°C, n=72) CPB on cognitive brain function. All patients received elective coronary artery bypass grafting (mean age 62.1±6.3 years, mean ejection fraction 60.4±13%). Cognitive brain function was objectively measured by cognitive P300 auditory-evoked potentials before surgery, 1 week and 4 months after surgery, respectively. Additionally, standard psychometric tests (‘trailmaking test A’, ‘mini-mental state’) were performed and clinical outcome was monitored. Results: Patients, operated with mild hypothermia, showed a marked impairment of cognitive brain function. As compared with before surgery (370±45 ms), P300 evoked potentials were prolonged at 1 week (385±37 ms; P<0.001) and even at 4 months (378±34 ms, P<0.001) after surgery, respectively. In contrast, patients operated with normothermic CPB, did not show an impairment of P300 peak latencies (before surgery 369±36 ms, 1 week after surgery 376±38 ms, n.s.; 4 months after surgery 371±32 ms, n.s.). Group comparison revealed a trend towards prolonged P300 peak latencies in the patient group undergoing mildly hypothermic CPB (P=0.0634) 1 week after surgery. Four months postoperatively, no difference between the two groups could be shown (P=n.s.) Trailmaking test A and mini mental state test failed to discriminate any difference. Five patients died (mild hypothermia n=3, normothermia n=2) postoperatively (cardiac related n=3, sepsis n=2). None of the patients experienced major adverse cerebrovascular events. Conclusions: Objective cognitive P300 auditory evoked potential measurements indicate, that subclinical impairment of cognitive brain function is more pronounced in patients undergoing mildly hypothermic CPB as compared with normothermic CPB for CABG.

Key Words: Coronary artery bypass grafting • Cognitive brain function • Cardiopulmonary bypass • Temperature

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