Variant angina results from temporary, severe narrowing of coronary arteries due to muscle spasms, typically at night or early morning. Unlike typical angina caused by physical exertion, this rare condition triggers sudden chest pain even at rest.
Coronary artery spasms occur when muscles in artery walls suddenly tighten, restricting blood flow to heart tissue. These spasms often last 2-15 minutes and can cause significant pain. The exact trigger remains unclear, though researchers suspect factors like cold temperatures, smoking, or certain medications may contribute.
While all cases involve coronary spasms, variant angina presents in two primary forms:
| Type | Characteristics | Typical Timing |
|---|---|---|
| Primary | No underlying coronary artery disease | Night or early morning |
| Secondary | Associated with existing heart conditions | Daytime or nighttime |
According to the American Heart Association, about 2% of people with angina have the variant type.
During my work at a cardiology clinic, we treated a 45-year-old patient who experienced sudden chest pain at 4 AM. ECG readings showed ST-segment elevation characteristic of variant angina. Nitroglycerin resolved the episode, confirming the diagnosis of coronary artery spasm.
Doctors diagnose variant angina through patient history, stress tests, and coronary angiography. Treatment typically includes calcium channel blockers and nitrates to prevent spasms. In severe cases, stent placement may be necessary.
Unlike typical angina, variant angina requires specialized treatment approaches focused on preventing coronary artery spasms rather than managing exertion-related symptoms.