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Ann Thorac Surg 1999;67:1900-1903
© 1999 The Society of Thoracic Surgeons
a Cardiothoracic Surgical Unit, University Hospital Birmingham, Queen Elizabeth Medical Centre, Birmingham, United Kingdom
Address reprint requests to Mr Bonser, Cardiothoracic Surgical Unit, University Hospital Birmingham, Queen Elizabeth Medical Centre, Edgbaston, Birmingham B15 2TH, UK
e-mail: r.s.bonser{at}bham.ac.uk
Presented at the Aortic Surgery Symposium VI, April 30–May 1, 1998, New York, NY.
Background. In aortic surgery requiring hypothermic circulatory arrest (HCA), retrospective studies identify age and duration of the arrest period as predictors of stroke and mortality. Retrograde cerebral perfusion (RCP) has been reported to reduce the risk of stroke when compared with historical controls. The aim of this study was to ascertain if RCP affected mortality, stroke, or the risk factors for these end points in a consecutive series of HCA patients.
Methods. We investigated the impact of RCP in 130 patients, mean age 62.7 years (range 20–84); 78 were men and 35% were emergencies. Overall mortality was 16.9% (elective 9.5%) and the incidence of stroke was 6.9%. Mean HCA time was 30.1 min (95% confidence interval [CI] 27.9–34). RCP was instituted in 96 cases for a mean of 24.4 min (95% CI 21.9–27.0).
Results. Perioperative univariate predictors of mortality were emergency status, acute rupture, long HCA and cardiopulmonary bypass duration, and postoperative complications. For stroke, age (p = 0.007), hypertension (p = 0.05), and long HCA duration (p = 0.01) were predictive. RCP did not decrease mortality (p = 0.18, OR 0.55) or incidence of stroke (p = 0.57, OR 1.26). Mortality after stroke was 44.4% (p = 0.04, OR 4.6). Multiple logistic regression showed severe aortic atherosclerosis and RCP duration (p = 0.038) as risk factors for mortality, and myocardial ischemic time (p = 0.012) and HCA duration (p = 0.05) as risk factors for stroke. HCA and RCP groups differed in HCA duration (HCA mean 25 min [10–80], RCP mean 32 min [10–69]; p < 0.019).
Conclusions. Age and HCA duration remain risk factors for stroke and mortality despite RCP. However, HCA times were longer in the RCP patients, and the patients were not randomized. The role of RCP in cerebral protection requires further prospective randomized studies.
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