Atrial Premature Contractions and Coronary Artery Stenosis - Cardiology

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Atrial Premature Contractions (APCs) are early heartbeats originating in the atria, which can be benign or indicative of underlying heart conditions. In your case, the presence of approximately 700 to 900 APCs per day, as noted in your Holter monitor results, is significant but not uncommon. Many individuals experience APCs without any associated symptoms or complications. The fact that your exercise stress tests and Holter monitoring have not shown signs of myocardial ischemia is reassuring.

Regarding the relationship between APCs and coronary artery stenosis, it is essential to understand that while both conditions can coexist, they do not necessarily have a direct correlation. Coronary artery stenosis refers to the narrowing of the coronary arteries, which can lead to reduced blood flow to the heart muscle and potentially result in ischemic heart disease. On the other hand, APCs are often related to factors such as stress, caffeine intake, electrolyte imbalances, or structural heart changes, rather than directly caused by coronary artery disease.

Your history of coronary artery stenosis, as identified in the 2009 CT scan, is noteworthy. However, subsequent tests, including the Tc-99 myocardial perfusion scan, indicated no significant issues, suggesting that your coronary arteries may not currently be causing any functional impairment. It is crucial to continue monitoring your cardiovascular health, especially given your history. Regular follow-ups with your cardiologist are advisable to assess any changes in your condition.

As for engaging in vigorous exercise, such as long-distance running, it is generally safe for individuals with APCs, especially if they are asymptomatic and have no underlying heart disease that would contraindicate such activities. However, it is essential to listen to your body. If you experience symptoms such as palpitations, dizziness, or chest discomfort during exercise, you should consult your healthcare provider. They may recommend further evaluation or adjustments to your exercise regimen.

In summary, while APCs and coronary artery stenosis can be related in some patients, they are distinct conditions. Your current monitoring suggests that your heart is functioning well, and with appropriate precautions, you can likely continue your exercise routine. Always consult with your cardiologist before making significant changes to your physical activity, especially given your medical history. Regular check-ups and monitoring are key to maintaining your cardiovascular health.