Most of us think of H1N1, or swine flu, as a respiratory illness — fever, cough, body ache, and a few days in bed. But as a cardiologist, I have seen firsthand that this virus does not always stay in the lungs. It can reach the heart too, and that’s something patients and families need to understand.
H1N1 belongs to the Influenza A family of viruses, which has several subtypes — A, B, and C — with influenza A being the most common and the one most often linked to heart complications.
When H1N1 affects the heart, it typically causes myocarditis, an inflammation of the heart muscle. In some patients, we notice changes on their ECG during routine checks, which prompts us to look closer. Further evaluation often reveals that the heart muscle itself has been damaged by the virus — not just irritated, but genuinely weakened.
There’s a second concern as well: H1N1 can trigger clot formation within the arteries. When a clot blocks blood flow to the heart, it can result in a full-blown heart attack. This is particularly worrying because it means a viral infection, not just cholesterol or lifestyle factors, can be the trigger for a cardiac event.
The risk climbs further for patients who already have other health conditions — diabetes, high blood pressure, or existing heart disease. In these individuals, H1N1-related heart involvement can, in the worst cases, lead to sudden cardiac death.
My advice to patients: don’t dismiss flu symptoms as “just the flu,” especially if you have underlying heart or health conditions. If you experience chest discomfort, breathlessness, or unusual fatigue during or after a bout of H1N1, get your heart checked. Catching these changes early can make all the difference.
(DrVikas Chopra is a senior cardiologist at Primus Hospital.)