Assessment of left ventricular diastolic dysfunction based on the intraventricular velocity difference by vector flow...

Area of Science:

• Cardiology
• Medical Imaging
• Physiology

Background:

• Left ventricular (LV) diastolic function is crucial for cardiac health.
• Assessing LV diastolic function traditionally involves complex measurements.
• Vector flow mapping (VFM) offers a novel approach to visualize and quantify intraventricular blood flow dynamics.

Purpose of the Study:

• To analyze the diastolic intraventricular velocity difference (DIVD) in patients with impaired LV diastolic function using VFM.
• To compare DIVD in patients with chronic heart failure (CHF) and hypertension-induced diastolic dysfunction against healthy controls.
• To explore the correlation of DIVD with established echocardiographic parameters of diastolic function.

Main Methods:

• Patients with LV diastolic dysfunction were categorized into two groups: CHF with restricted filling (n=27) and hypertension with abnormal relaxation (n=34).
• A control group of healthy participants (n=22) was included.
• VFM technology was employed to analyze left ventricular inflow color Doppler findings, measuring flow velocity rates at the LV base and apex to calculate DIVD.

Main Results:

• The DIVD was significantly lower in both patient groups (40.35 ± 6.80 cm/s and 48.50 ± 6.03 cm/s) compared to controls (79.95 ± 9.88 cm/s) (P < .001).
• DIVD showed significant associations with ejection fraction (P = .0002) and deceleration time (P = .0306).
• Peak atrial contraction velocity was negatively correlated with DIVD (P = .0003).

Conclusions:

• The DIVD, calculated using VFM, can serve as a quantitative measure for assessing LV diastolic function.
• VFM technology demonstrates clinical utility in identifying and reflecting LV diastolic dysfunction in pathological conditions.
• This approach provides a practical method for evaluating diastolic intraventricular velocity differences.