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Relation of transmitral flow velocity patterns to left ventricular diastolic function: new insights from a combined
C P Appleton1, L K Hatle, R L Popp
1Division of Cardiology, Stanford University School of Medicine, California.
Insights
Pulsed wave Doppler echocardiography can reveal useful clinical information about left ventricular diastolic function. Mitral flow patterns correlate with cardiac conditions and hemodynamic status, showing potential for noninvasive assessment.
Area of Science:
- Cardiology
- Echocardiography
- Hemodynamics
Background:
- Assessing left ventricular diastolic function noninvasively is crucial for diagnosing and managing cardiac diseases.
- Pulsed wave Doppler echocardiography offers a noninvasive method to evaluate cardiac function.
Purpose of the Study:
- To determine the clinical utility of pulsed wave Doppler echocardiography in assessing left ventricular diastolic function.
- To correlate mitral flow velocity patterns with hemodynamic findings in various cardiac conditions.
Main Methods:
- Correlated mitral flow velocity patterns and variables with hemodynamic findings in 70 patients with cardiac disorders and 6 controls.
- Investigated the effect of hemodynamic changes on mitral flow velocity in a subgroup undergoing left ventriculography.
- Used mitral flow velocity recordings from 30 healthy adults as a reference.
Main Results:
- Most patients exhibited abnormal mitral flow velocity patterns, indicative of diastolic dysfunction.
- Distinct patterns were observed in patients with impaired left ventricular relaxation.
- Mitral patterns reflected myocardial function and hemodynamics rather than specific disease types, with some patterns suggesting altered filling pressures.
Conclusions:
- Mitral flow velocity patterns can provide valuable insights into left ventricular diastolic function, despite indirect measurement.
- Abnormal patterns can be normalized by increased left atrial pressure, potentially masking underlying relaxation abnormalities.
- These patterns represent a dynamic continuum, suggesting potential for monitoring disease progression and treatment response.
Abstract:
In an effort to determine what clinically useful information regarding left ventricular diastolic function can be inferred noninvasively with pulsed wave Doppler echocardiography, mitral flow velocity patterns and measured variables were correlated with hemodynamic findings in 70 patients: 30 with coronary artery disease, 20 with idiopathic congestive cardiomyopathy, 14 with a restrictive myocardial process and 6 without significant cardiac disease. The effect of sudden changes in hemodynamics on the mitral flow velocity pattern was also investigated in a subgroup of patients who had simultaneous recording of mitral flow velocity and left ventricular pressure before and after left ventriculography. Mitral flow velocity recordings from 30 healthy adults served as a reference group. This analysis suggests that 1) the majority of patients with these cardiac disorders demonstrate abnormal mitral flow velocity patterns or variables; 2) markedly different flow velocity patterns can be seen in patients with impaired left ventricular relaxation; 3) the different mitral patterns appear to relate more to myocardial function and hemodynamic status than to the type of disease process present; 4) certain mitral patterns suggest different filling pressures and rates of early diastolic left ventricular filling; 5) an increase in left atrial pressure can "normalize" an abnormal mitral flow velocity pattern and "mask" a left ventricular relaxation abnormality; and 6) the different patterns appear to represent a dynamic continuum with the potential to change from one to another as a result of disease progression, medical therapy or sudden changes in hemodynamics. It is concluded that, despite the indirect method of estimation and certain limitations, mitral flow velocity recordings have clinical potential in assessing left ventricular diastolic function that merits further investigation.