What factor must be considered for a driver after a coronary bypass graft?

Considering a driver's medical fitness after a coronary bypass graft, the left ventricular ejection fraction (LVEF) is a key factor. LVEF measures how well the heart is pumping blood and serves as an important indicator of cardiac function. For a driver who has undergone a coronary bypass graft, it is crucial to evaluate their heart's ability to efficiently circulate blood, particularly since their cardiac health could significantly impact their driving ability.

A LVEF greater than 40% suggests that the heart is functioning adequately and can support the physical demands of driving, including the ability to respond to sudden changes in traffic conditions. Therefore, ensuring that the LVEF is above this threshold helps in determining whether the driver can safely operate a vehicle.

The other factors mentioned, although important in broader health assessments, do not directly correlate with the immediate impact of cardiac function on a driver's ability to operate a vehicle safely following a major cardiac procedure.