Relation between Q-QS changes on the rest electrocardiogram and left ventricular function with healed myocardial...

Area of Science:

• Cardiology
• Cardiac Imaging
• Electrocardiography

Background:

• Assessing left ventricular (LV) function is crucial for managing patients post-myocardial infarction (MI).
• Electrocardiogram (ECG) findings, specifically Minnesota Q-QS codes, may offer insights into myocardial damage and LV function.
• The long-term relationship between ECG codes and LV function after MI requires further investigation.

Purpose of the Study:

• To investigate the correlation between Minnesota Q-QS codes on rest electrocardiograms and left ventricular function in patients with healed myocardial infarction.
• To determine if this relationship persists and potentially strengthens over time after acute MI.

Main Methods:

• Retrospective analysis of 838 patients with healed myocardial infarction from the Program of Surgical Control of Hyperlipidemia.
• Assessment of Minnesota Q-QS codes from rest electrocardiograms at randomization.
• Evaluation of left ventricular function using left ventriculography, measuring ejection fraction and segmental wall motion abnormalities.

Main Results:

• A strong correlation was observed between the severity of Minnesota Q-QS codes and concurrent left ventricular function.
• Patients without Q-QS codes exhibited less myocardial damage compared to those with codes.
• The extent of LV damage correlated with the significance and location of Q-QS codes, with anteroseptal involvement indicating greater damage.
• The correlation between LV function and Minnesota codes persisted and was stronger when assessed in the healed state, remote from the acute MI event.

Conclusions:

• Minnesota Q-QS codes are reliable indicators of left ventricular function in patients with healed myocardial infarction.
• The relationship between ECG-derived codes and LV function is robust and enduring, even years after the acute event.
• These findings support the use of ECG analysis for non-invasively assessing cardiac damage and function post-MI.