[Precordial ST-segment elevation caused by right coronary artery occlusion]

Area of Science:

• Cardiology
• Interventional Cardiology
• Electrophysiology

Context:

• Percutaneous transluminal coronary angioplasty (PTCA) for the right coronary artery can elicit electrocardiographic changes.
• ST-segment elevation in precordial leads (V1-3) during PTCA is an uncommon finding.
• Understanding the mechanism of these changes is crucial for patient management.

Purpose:

• To investigate the mechanism of precordial ST-segment elevation observed during right coronary artery PTCA.
• To correlate ST-segment elevation with coronary artery anatomy and collateral circulation.
• To differentiate between right ventricular ischemia and other causes of ST elevation.

Summary:

• Eight of 57 patients undergoing right coronary artery PTCA developed precordial ST-segment elevation.
• This elevation was linked to occlusion of proximal right coronary artery branches, affecting right ventricular supply.
• The phenomenon was more common in patients with functionally dominant left coronary arteries or balanced supply, suggesting right ventricular ischemia.
• It was less frequent in functionally dominant right coronary arteries, possibly due to masking by inferior wall ischemia.

Impact:

• The findings suggest that precordial ST-segment elevation during right coronary artery PTCA is a marker for right ventricular ischemia.
• This understanding can help clinicians interpret intra-procedural ECG changes more accurately.
• It highlights the importance of assessing coronary artery dominance and collateral flow during interventions.