BMJ 2002;325:1268 ( 30 November )

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Assessment of neurocognitive impairment after off-pump and on-pump techniques for coronary artery bypass graft surgery: prospective randomised controlled trial

Editorial by Taggart

Vipin Zamvar, consultant surgeona David Williams, specialist registrarb Judith Hall, senior lecturerb Nicola Payne, biostatisticianc Clare Cann, research nurseb Karen Young, clinical scientistd S Karthikeyan, specialist registrarb John Dunne, consultant anaesthetistb

a Department of Cardiac Surgery, University Hospital of Wales, Cardiff CF14 4XW, b Department of Anaesthesiology, University Hospital of Wales, c Medical Data Research Centre, Providence Health System, Portland, OR 97225, USA, d Department of Immunology, UK National External Quality Assurance Scheme, Sheffield S5 7YT

Correspondence to: Mr V Zamvar Department of Cardiac Surgery, Royal Infirmary of Edinburgh, Edinburgh EH3 9YW zamvarv{at}hotmail.com

Objective: To assess neurocognitive impairment after the off-pump and on-pump techniques for coronary artery bypass graft surgery in patients with triple vessel disease.
Design: Randomised controlled trial.
Setting: University Hospital of Wales, Cardiff.
Participants: 60 patients undergoing coronary artery bypass graft surgery for triple vessel disease prospectively randomised to the off-pump or on-pump technique.
Main outcome measures: Change in scores in nine standard neuropsychometric tests administered preoperatively and at 1 and 10 weeks postoperatively.
Results: The on-pump group showed a significantly greater deterioration in scores for two and three tests at 1 week and 10 weeks postoperatively, respectively, than the off-pump group. The on-pump group also showed a significantly higher incidence of major deterioration in one of the tests both 1 week and 10 weeks postoperatively. The incidence of neurocognitive impairment at 1 week postoperatively was 27% (8 out of 30) in the off-pump group and 63% (19 out of 30) in the on-pump group (P=0.004); and at 10 weeks postoperatively was 10% (3 out of 30) in the off-pump group and 40% (12 out of 30) in the on-pump group (P=0.017).
Conclusion: Off-pump coronary artery bypass graft surgery results in less neurocognitive impairment than the on-pump technique.

What is already known on this topic
Neurocognitive impairment after coronary artery bypass graft surgery occurs in a major proportion of patients

Cardiopulmonary bypass has been implicated, but the evidence is inconclusive

What this study adds
Off-pump coronary artery bypass graft surgery results in less neurocognitive impairment than the on-pump technique





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