Which of the following is a typical consideration when selecting OPCAB versus on-pump CABG?

• A. Hemodynamic stability.
• B. Hair color of the patient.
• C. Time of day.
• D. Hospital building age.

Answer: (A)

The main idea being tested is how a patient’s circulating stability guides the choice between operating on a beating heart versus using a heart-lung machine. In OPCAB, the surgeon works on a beating heart with stabilizers, so maintaining adequate blood pressure and cardiac output during vessel exposure is crucial. If the heart becomes unstable or the patient’s hemodynamics cannot be maintained during off-pump manipulation—such as in someone with poor ventricular function or when several grafts require significant heart displacement—using cardiopulmonary bypass with cardiac arrest and myocardial protection provides a controlled environment and reliable perfusion. In patients who can tolerate beating-heart work with stable hemodynamics, OPCAB can avoid the risks associated with bypass. The other factors listed—hair color, time of day, or hospital building age—do not influence the physiological or technical aspects of the procedure and thus are not typical considerations in this decision.