Angiographic demonstration of different pathogenetic mechanisms in patients with spontaneous and exertional angina associated with S-T segment depression
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Spontaneous chest pain in patients was linked to coronary artery spasm. Exercise-induced chest pain, however, resulted from increased oxygen demand, not reduced blood flow, indicating dual causes of subendocardial ischemia.
Area of Science:
- Cardiology
- Pathophysiology
Background:
- Chest pain is a common symptom with various underlying causes.
- Subendocardial ischemia can manifest with electrocardiographic changes like S-T segment depression.
Observation:
- Three patients presented with spontaneous and exertional chest pain.
- Electrocardiograms showed S-T segment depression in anterior leads during pain episodes.
- Coronary arteriography revealed coronary artery spasm during spontaneous pain attacks.
Findings:
- Coronary artery spasm was confirmed as the cause of spontaneous chest pain and S-T segment depression.
- Exercise-induced angina did not show spastic coronary obstruction.
- Exercise-induced chest pain and S-T segment depression were attributed to increased myocardial oxygen demand.
Implications:
- Patients can experience chest pain due to distinct mechanisms occurring simultaneously.
- Understanding these dual pathogenetic mechanisms is crucial for accurate diagnosis and treatment of chest pain.
- This highlights the complexity of coronary artery disease and ischemic events.
Abstract:
Three patients complained of spontaneous and exertional chest pain, both associated with S-T segment depression in anterior electrocardiographic leads. In each, coronary spasm was demonstrated on coronary arteriography during a spontaneous attack of pain. Coronary arteriograms taken during exercise-induced angina did not show evidence of spastic obstruction; this suggests that exercise-induced chest pain and S-T segment depression were secondary to the increase in oxygen requirements rather than to a sudden decrease in coronary blood flow. Thus, two pathogenetic mechanisms coexisting in the same patient may cause chest pain associated with subendocardial ischemia.