Longitudinal left ventricular function is globally depressed within a week of STEMI

Area of Science:

• Cardiovascular imaging
• Cardiac mechanics
• Myocardial infarction research

Background:

• Atrioventricular plane displacement (AVPD) normally contributes significantly to left ventricular (LV) stroke volume (SV).
• The impact of ST-elevation myocardial infarction (STEMI) on AVPD and its functional contribution requires further elucidation.

Purpose of the Study:

• To assess the effect of STEMI on AVPD and its contribution to SV.
• To investigate the relationship between AVPD, infarct size (IS), and infarct location post-STEMI.

Main Methods:

• Cardiovascular magnetic resonance imaging was used in 177 STEMI patients and 20 healthy controls.
• Left ventricular volumes, AVPD at six locations, and longitudinal contribution to SV were quantified.
• Correlation analysis was performed between AVPD, IS, and infarct location.

Main Results:

• STEMI patients exhibited reduced global AVPD (11±2 mm vs. 15±2 mm) and lower AVPD contribution to SV (58±9% vs. 64±8%) compared to controls.
• Decreased AVPD was observed in both infarcted and remote myocardial segments.
• A weak negative correlation was found between IS and AVPD (r²=0.06); infarct location did not significantly affect global AVPD.

Conclusions:

• Global and regional AVPD are reduced within one week of STEMI, affecting both infarcted and remote myocardium.
• AVPD remains the primary contributor to SV post-STEMI, despite reductions.
• Infarct size and location have minimal impact on global AVPD, complicating assessment of LV function from longitudinal measures alone.