Importance of ventricular longitudinal function in chronic heart failure

Area of Science:

• Cardiology
• Cardiovascular Imaging
• Exercise Physiology

Background:

• Cardiopulmonary exercise testing (CPET) is crucial for assessing exercise capacity in chronic heart failure (CHF).
• Previous research suggests diastolic function correlates better with exercise capacity than systolic function in CHF patients.
• Echocardiographic parameters are underutilized in predicting outcomes and assessing functional capacity in CHF.

Purpose of the Study:

• To investigate the correlation between resting echocardiographic measurements and CPET results in CHF patients.
• To determine the predictive value of echocardiographic parameters for cardiovascular prognosis in CHF.

Main Methods:

• 140 CHF patients underwent resting 2D echocardiograms and CPET.
• Echocardiographic measurements included left ventricular ejection fraction (LVEF), early diastolic peak velocity (E'), global longitudinal strain (GLS), right ventricular (RV) systolic strain, and left atrial systolic strain.
• Patients were followed for a mean of 38 months for cardiovascular events.

Main Results:

• LVEF showed a weak correlation with peak VO₂ (r=0.21).
• Systolic and early diastolic LV longitudinal function (E': r=0.38; GLS: r=-0.4) correlated best with peak VO₂.
• GLS and RV systolic strain were the strongest independent predictors of adverse cardiovascular events (OR 1.31 and 1.05, respectively).

Conclusions:

• Resting RV and LV longitudinal functions are reliable predictors of adverse cardiovascular events in CHF.
• These echocardiographic measures correlate moderately with CPET results but do not substitute for CPET.
• Echocardiography provides valuable prognostic information in CHF patients.