Relationship of ischemic times and left atrial volume and function in patients with ST-segment elevation myocardial...

Area of Science:

• Cardiology
• Cardiovascular Imaging
• Myocardial Infarction Research

Background:

• The impact of ischemia duration on left atrial (LA) volumes and function during acute myocardial infarction is not well understood.
• ST-segment elevation myocardial infarction (STEMI) management involves primary percutaneous coronary intervention (PCI) to restore blood flow.

Purpose of the Study:

• To investigate the relationship between ischemic times, echocardiographic indices of diastolic function, and LA volumes in STEMI patients undergoing primary PCI.
• To determine if increased LA volume is an indicator of elevated left ventricular filling pressures.

Main Methods:

• Echocardiography was performed within 48 hours of primary PCI in 433 STEMI patients to measure LA volumes and the E/e' ratio.
• Ischemic times (onset of chest pain to hospital admission and reperfusion) and Troponin I release were recorded.
• Statistical analysis was used to correlate ischemic times, diastolic function indices, and LA volumes.

Main Results:

• Patients with elevated LA volume index (LAVI ≥28 ml/m²) had significantly longer total ischemic times and higher E/e' ratios compared to those with lower LAVI.
• Significant correlations were observed between the E/e' ratio and LA volumes throughout the cardiac cycle.
• Total ischemic time, E/e' ratio, and restrictive filling pattern were independent predictors of LA enlargement.

Conclusions:

• Increased left atrial volume in STEMI patients treated with primary PCI is associated with longer ischemic durations.
• Elevated LA volume may serve as a sensitive marker for increased left ventricular filling pressures in the acute phase of STEMI.