Bengaluru marathoner, 48, found 90% blockage in his arteries: What caused them?

At 48 years old, a marathon runner appeared to be in perfect health, regularly participating in marathons and maintaining a rigorous fitness routine. However, he overlooked an important factor - his family history of heart issues. Upon learning about his brother's angioplasty at 52 and the male predecessors with shorter lifespans in the family, he decided to undergo a CT coronary angiogram.

The results were alarming; he had blockages ranging from 75 to 90 percent in all four major coronary arteries. His condition necessitated bypass surgery instead of angioplasty.

This case highlights the misconception that physical fitness guarantees freedom from heart disease. Despite his fitness level, the marathon runner's heart arteries were severely compromised. The human heart is an extraordinary organ with a significant reserve capacity, which enables it to pump several times its normal rate during intense physical activity. This reserve can sometimes mask the effects of coronary artery narrowing, allowing individuals to appear healthy even with substantial blockages.

However, this doesn't mean that the blockages are harmless. When the heart's demand for oxygen-rich blood surpasses what the narrowed arteries can deliver, serious consequences can arise. Gradual deconditioning, where people unconsciously reduce their physical activity as their capacity declines, may further mask symptoms. Unexplained fatigue, reduced exercise capacity, breathlessness, sweating, or discomfort during exertion should not be dismissed as mere signs of aging.

One concerning phenomenon is silent ischaemia, where the heart muscle doesn't receive adequate oxygen-rich blood due to narrowed coronary arteries. While reduced blood supply can cause chest pain in many, some individuals experience no obvious warning signs, particularly in those with diabetes, as it can damage the nerves responsible for transmitting pain signals.

The takeaway from this tragic story is not that exercise is dangerous, but that fitness alone cannot rule out coronary artery disease. Regular physical activity remains crucial for cardiovascular health, but it should not lull individuals into a false sense of security. Family history, routine health checks, and awareness of subtle symptoms are essential.

A cardiologist may recommend further evaluation based on age, family history, symptoms, and other risk factors, such as a coronary artery calcium score, exercise stress test, or CT coronary angiogram. Ultimately, symptoms and fitness levels alone are not proof of the absence of heart disease, so maintaining fitness should not replace vigilant heart health monitoring.