Which system in the body must be stable for a driver with a pacemaker to be certified?

The cardiovascular system must be stable for a driver with a pacemaker to be certified because the pacemaker is a device implanted to regulate heart rhythms. It functions to maintain adequate heart rate and rhythm, directly affecting overall cardiovascular stability. A driver needs to have a well-functioning cardiovascular system to ensure that their heart can effectively circulate blood and deliver oxygen to tissues during driving, which requires vigilance and responsiveness.

If the cardiovascular system is not stable, it can lead to complications such as arrhythmias, fainting, or other serious issues that could impair the driver's ability to operate a vehicle safely. Therefore, for the driver’s safety and that of others on the road, it is crucial that their cardiovascular status is stable before certification.

The other systems, while important for overall health, do not specifically influence the function of the pacemaker or the immediate implications for driving safety in the same way that the cardiovascular system does.