[Abnormal left ventricular flow during diastole in hypertrophic heart disease]

Area of Science:

• Cardiology
• Echocardiography
• Physiology

Background:

• Left ventricular diastolic function is crucial for cardiac health.
• Isovolumic relaxation flow velocity (IRFV) is a novel parameter for assessing diastolic function.
• Hypertrophic heart disease (HHD) can significantly alter ventricular dynamics.

Purpose of the Study:

• To investigate the characteristics of isovolumic relaxation flow velocity (IRFV) in the mid-portion of the left ventricle.
• To assess the correlation between IRFV and left ventricular filling velocities during rest and exercise.
• To explore the association between prominent IRFV and hypertrophic heart disease.

Main Methods:

• Doppler echocardiography was performed at rest on 20 healthy subjects and 18 with HHD.
• Exercise Doppler echocardiography was conducted on 10 healthy subjects to assess hyperdynamic states.
• Left ventricular filling velocities were measured at the mitral valve and mid-ventricle, analyzing rapid filling (%R) and atrial contraction (%A) phases.

Main Results:

• A significant correlation was found between IRFV and the acceleration of rapid filling velocity (%R) (r = 0.75, p < 0.001).
• No correlation was observed between IRFV and the atrial contraction phase (%A).
• Prominent IRFV (≥30 cm/sec) was detected in 13 subjects, predominantly (10/13) those with HHD. IRFV, %R, and %A did not increase during exercise.

Conclusions:

• Prominent IRFV is associated with accelerated mid-ventricular rapid filling velocity.
• This phenomenon may indicate regional and asynchronous hyperdynamic states characteristic of hypertrophic heart disease.
• IRFV may serve as a valuable indicator in the assessment of diastolic dysfunction in HHD.