Assessment of left ventricular volume and ejection fraction: comparison of QGS and MBGS analyses of ECG-gated myocardial perfusion SPECT imaging

Improved Diastolic Function Is Associated With Higher Cardiac Output in Patients With Heart Failure Irrespective of Left Ventricular Ejection Fraction

BACKGROUND

Little is known regarding the impact of diastolic function on cardiac output (CO) in patients with heart failure, particularly in patients with lower ejection fraction. This study aimed to evaluate the impact of end-diastolic pressure-volume relationship (EDPVR) on CO and end-diastolic pressure (EDP).

METHODS AND RESULTS

We retrospectively analyzed 1840 consecutive patients who underwent heart catheterization. We divided patients into 8 groups according to ejection fraction (EF) (35-45%, 46-55%, 56-65%, and 66-75%) and EDP (>16 or ≤16 mm Hg). We estimated EDPVR from single measurements in the catheterization data set. Then, we replaced EDPVRs of high-EDP groups with those of normal-EDP groups and compared CO before and after EDPVR replacement. Normalized EDPVR significantly increased CO at EDP=10 mm Hg regardless of EF (EF 35-45%, from 4.5±1.6 to 4.9±1.0; EF 46-55%, 4.6±1.3 to 5.1±1.1; EF 56-65%, 4.9±1.5 to 5.2±1.0; EF 66-75%, 4.9±1.5 to 5.2±1.1). Changes in CO were similar across EF groups.

CONCLUSIONS

Diastolic function normalization was associated with higher CO irrespective of EF. Diastolic dysfunction plays an important role in determining CO irrespective of EF in heart failure patients.