Time-Dependent Regional Myocardial Strains in Patients with Heart Failure with a Preserved Ejection Fraction

الملخص EN

Objectives.

To better understand the etiology of HFpEF in a controlled human population, regional time-varying strains were computed using echocardiography speckle tracking in patients with heart failure with a preserved ejection fraction and normal subjects.

Methods.

Eleven normal volunteers and ten patients with echo-graded diastolic dysfunction and symptoms of heart failure were imaged with echocardiography and longitudinal, circumferential, and rotational strains were determined using speckle-tracking.

Diastolic strain rate was also determined.

Patient demographics and echo-derived flows, volumes, and pressures were recorded.

Results.

Peak longitudinal and circumferential strain was globally reduced in patients ( p < 0.001 ), when compared to controls.

The patients attained peak longitudinal and circumferential strain at a consistently later point in systole than controls.

Rotational strains were not different in most LV regions.

Early diastolic strain rate was significantly reduced in the patients ( p < 0.001 ).

LV mass and wall thickness were significantly increased in the patients; however ejection fraction was preserved and stroke volume was diminished ( p < 0.001 ).

Conclusions.

This study shows that patients with HFpEF have reduced early diastolic strain rate and reduced peak strain that is regionally homogeneous and that they also utilize a longer fraction of systole to achieve peak axial strains.