Chronic recurrent angina

Area of Science:

• Cardiology
• Clinical Medicine

Background:

• Variant angina, also known as Prinzmetal's angina, is a condition characterized by recurrent chest pain due to transient coronary artery spasm.
• Understanding the natural history and variability of variant angina is crucial for effective patient management and therapeutic development.

Observation:

• Continuous electrocardiographic monitoring revealed numerous ST elevation episodes, with a high percentage being asymptomatic.
• Episode duration varied significantly, and some were associated with arrhythmias like premature ventricular contractions.
• A decrease in the frequency and duration of ST elevation and pain episodes was observed during hospitalization.

Findings:

• Double-blind crossover trials evaluated propranolol, indomethacin, and chlorpheniramine.
• No tested therapeutic agent demonstrated a significant beneficial effect on the disease course.
• High-dose propranolol was associated with an increase in episode duration.

Implications:

• The significant variability in variant angina necessitates the use of robust study designs, such as double-blind crossover trials, to accurately assess treatment efficacy.
• Current therapeutic options may have limited impact on the natural course of variant angina.
• Further research is needed to identify effective treatments for this condition.