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Left ventricular outflow tract presystolic flow velocity--another marker of left ventricular diastolic function
1Department of Cardiology, JLN Medical College, Rajasthan, India.
Insights
Increased left ventricular outflow tract (LVOT) presystolic flow velocity may indicate impaired left ventricular compliance. This finding correlates with altered transmitral flow patterns in hypertensive patients, suggesting a new potential diagnostic marker.
Area of Science:
- Cardiology
- Echocardiography
- Physiology
Background:
- Left ventricular (LV) diastolic dysfunction is a common complication of hypertension.
- Transmitral flow patterns assessed by Doppler echocardiography are established markers of diastolic function.
- The role of LV outflow tract (LVOT) presystolic flow in reflecting LV compliance is less understood.
Purpose of the Study:
- To investigate the relationship between LVOT presystolic flow velocities and transmitral flow patterns in normal individuals and hypertensive patients.
- To determine if LVOT presystolic flow can serve as an additional marker for impaired left ventricular compliance.
Main Methods:
- Pulse Doppler echocardiography was used to measure LVOT presystolic flow velocities and transmitral flow velocities (E and A waves).
- Studies were conducted on 30 normal subjects and 30 patients with mild hypertension exhibiting transmitral flow patterns suggestive of impaired relaxation.
- Statistical analysis was performed to correlate LVOT presystolic flow with transmitral flow parameters.
Main Results:
- Hypertensive patients showed significantly higher transmitral A wave velocity (p < 0.001) and lower E/A ratio (p < 0.001) compared to normal subjects.
- LVOT presystolic flow velocities demonstrated a significant direct correlation with transmitral A wave velocity (p < 0.01).
- A significant inverse relation was found between LVOT presystolic flow velocities and the transmitral E/A ratio (p < 0.05).
Conclusions:
- Elevated LVOT presystolic flow peak velocity may serve as an additional indicator of impaired left ventricular compliance during atrial contraction.
- These preliminary findings suggest a potential new echocardiographic marker for diastolic dysfunction.
- Further research is warranted to validate and establish the precise clinical utility of this observation.
Abstract:
Left ventricular outflow tract (LVOT) presystolic flow velocities were studied using pulse doppler echocardiography in 30 normal persons. Thirty patients of mild hypertension with transmitral flow velocity pattern suggestive of impaired relaxation were also studied. Transmitral flow velocity pattern was correlated with LVOT presystolic flow velocities in the two groups. Hypertensive patients had significantly higher transmitral A wave velocity (p < 0.001) and significantly lower transmitral E wave/A wave velocity ratio (p < 0.001) as compared to normal group. LVOT presystolic flow velocities had significant direct correlation with transmitral A wave velocity (p < 0.01) and significant inverse relation with transmitral E wave/A wave velocity ratio (p < 0.05). Our observations suggest that increased LVOT presystolic flow peak velocity can also be used as another marker of impaired left ventriCular compliance during atrial contraction. More work is needed to establish exact status of this preliminary observation.