Association between new electrocardiographic abnormalities after coronary revascularization and five-year cardiac...

Area of Science:

• Cardiology
• Interventional Cardiology
• Cardiac Surgery

Background:

• Few studies compare new electrocardiographic (ECG) abnormalities after coronary artery bypass grafting (CABG) versus percutaneous transluminal coronary angioplasty (PTCA).
• The association between these new ECG abnormalities and long-term cardiac mortality requires further investigation.

Purpose of the Study:

• To compare the frequency of new ECG abnormalities following CABG versus PTCA.
• To assess the impact of these new ECG abnormalities on long-term cardiac mortality.

Main Methods:

• Analysis of 3,373 patients from the Bypass Angioplasty Revascularization Investigation (BARI) trial, randomized or eligible for CABG or PTCA.
• Comparison of new postprocedural ECG abnormalities (Q waves, ST elevation, T-wave changes) between the two procedures.
• Assessment of 5-year cardiac mortality rates in relation to new ECG abnormalities.

Main Results:

• New postprocedural ECG abnormalities were significantly more frequent after CABG than PTCA.
• Major Q waves, ST-segment elevation, and T-wave abnormalities occurred more often after CABG.
• The development of new Q-wave abnormalities was associated with a significantly increased adjusted relative risk of 5-year cardiac mortality after both CABG (2.6) and PTCA (4.6).

Conclusions:

• Patients undergoing CABG exhibit a higher incidence of postprocedural ECG abnormalities compared to those undergoing PTCA.
• New postprocedural Q-wave abnormalities, regardless of the revascularization strategy, are linked to significantly elevated long-term cardiac mortality.