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Evaluation of left ventricular diastolic function when mitral E and A waves are completely fused: role of assessing
Insights
Even when mitral E and A waves fuse, mitral annulus velocity effectively assesses left ventricular diastolic function. This method provides crucial insights into diastolic function when traditional parameters are obscured.
Area of Science:
- Cardiology
- Echocardiography
- Diastology
Background:
- Mitral inflow parameters are standard for assessing left ventricular (LV) diastolic function.
- Complete fusion of mitral E and A waves renders these parameters ineffective for evaluating LV diastolic function.
Purpose of the Study:
- To investigate the utility of mitral annulus velocity in assessing LV diastolic function when mitral E and A waves are fused.
- To determine if mitral annulus velocity can predict diastolic parameters like tau and LV filling pressure in this specific clinical scenario.
Main Methods:
- Echocardiographic measurements of mitral inflow, mitral annulus velocity, and tau were performed in 59 patients with fused mitral E and A waves.
- Right atrial pacing was used to induce complete fusion of mitral E and A waves.
- Correlation and discrimination analyses were conducted to assess the relationship between parameters.
Main Results:
- Peak fused mitral annulus velocity correlated significantly with tau (r = -0.60, P <.001).
- A peak fused mitral annulus velocity <12.5 cm/s accurately identified prolonged tau (sensitivity 78%, specificity 69%).
- The ratio of peak fused mitral inflow velocity to peak fused mitral annulus velocity correlated with LV filling pressure (r = 0.62, P <.001), with a ratio ≥8 predicting elevated pressure (sensitivity 65%, specificity 74%).
Conclusions:
- Mitral annulus velocity measurements are valuable for evaluating LV diastolic function even when mitral E and A waves are completely fused.
- This technique offers a viable alternative for assessing diastolic function in challenging echocardiographic situations.
- Mitral annulus velocity provides a reliable method for estimating diastolic dysfunction and filling pressures when conventional methods fail.
Abstract:
Mitral inflow parameters have been used most widely in the evaluation of left ventricular (LV) diastolic function. However, when the mitral E and A waves are completely fused, mitral inflow parameters cannot provide information about the LV diastolic function. LV filling pressure, mitral inflow, mitral annulus velocity, and tau (tau) were measured in 59 patients with sinus rhythm when mitral E and A waves were completely fused with right atrial pacing. When mitral E and A waves were completely fused, tau correlated with the peak fused mitral annulus velocity (r = -0.60, P <.001), and peak fused mitral annulus velocity of less than 12.5 cm/s best discriminated prolonged (>/=50 ms) from normal tau, with a sensitivity of 78% and specificity of 69%. The peak fused mitral inflow velocity to peak fused mitral annulus velocity ratio correlated with LV filling pressure (r = 0.62, P <.001). A ratio of at least 8, could predict elevated LV filling pressure (>/=15 mm Hg) with a sensitivity of 65% and specificity of 74%. In conclusion, even when mitral E and A waves are completely fused, mitral annulus velocity can be used in the evaluation of LV diastolic function.