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Should I change to OPCAB?

Marius J Swart¹, Gina Joubert

¹Bloemfontein Medi-Clinic, Kellner Street, Bloemfontein, South Africa.

Cardiovascular Journal of South Africa : Official Journal for Southern Africa Cardiac Society [And] South African Society of Cardiac Practitioners

|July 29, 2005

Summary

Off-pump coronary artery bypass surgery (OPCAB) benefits are debated. A local study found low event rates, making OPCAB superiority difficult to prove due to the large patient numbers required for statistical significance.

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Area of Science:

Cardiovascular Surgery
Evidence-Based Medicine

Background:

The benefits of off-pump coronary artery bypass surgery (OPCAB) are frequently discussed in surgical literature.
Questions remain regarding the universal applicability and necessity of adopting OPCAB across all surgical practices.

Purpose of the Study:

To evaluate the feasibility of establishing the superiority of OPCAB in a local practice.
To determine the sample size required for a randomized controlled trial (RCT) to demonstrate OPCAB benefits.

Main Methods:

A retrospective observational study analyzed 507 patients who underwent coronary artery bypass grafting (CABG) with cardiopulmonary bypass.
Calculations were performed to estimate the patient cohort size needed for an RCT to detect significant improvements with OPCAB.

Main Results:

The study reported low event rates: mortality (1.4%), myocardial infarction (0.8%), renal dialysis (0.8%), and stroke (1.2%).
A significant number of patients (16%) required homologous blood transfusions.
An estimated 262,000 patients would be needed for an RCT to detect a 12.5% reduction in event rates, or 2300 patients for a 50% reduction.

Conclusions:

The local prevalence of adverse events is very low.
The sample size required for a definitive study on OPCAB superiority in this practice is prohibitively large.
The supremacy of OPCAB for this specific practice remains unestablished based on current data.

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