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[Diastolic function of the left ventricle in aortic valve stenosis. Doppler echocardiography]
Insights
Doppler echocardiography effectively assesses left ventricular diastolic function in aortic stenosis patients, revealing distinct patterns related to pulmonary capillary pressure. These findings aid in understanding diastolic dysfunction in this population.
Area of Science:
- Cardiology
- Echocardiography
- Diastolic Function
Background:
- Aortic stenosis (AS) significantly impacts left ventricular (LV) diastolic function.
- Assessing diastolic dysfunction in AS is crucial for patient management.
- Catheterization and Doppler echocardiography are methods to evaluate cardiac hemodynamics.
Purpose of the Study:
- To compare Doppler echocardiographic parameters of LV diastolic function with invasive catheter data in patients with pure or dominant aortic stenosis.
- To investigate the correlation between Doppler-derived diastolic parameters and hemodynamic variables in AS.
- To determine the influence of age, stenosis severity, and left ventricular hypertrophy on diastolic function measurements.
Main Methods:
- Retrospective analysis of 35 patients with pure or dominant aortic stenosis.
- Comparison of Doppler echocardiographic measurements (isovolumic relaxation time, E wave velocity, E/A ratio, mitral valve pressure half time) with invasive hemodynamic data.
- Correlation analysis between Doppler parameters and ejection fraction, pulmonary capillary pressure, age, stenosis severity, and LV hypertrophy.
Main Results:
- Isovolumic relaxation time was prolonged in most patients and not influenced by hemodynamic parameters.
- Mitral valve pressure half time positively correlated with ejection fraction and negatively with pulmonary capillary pressure.
- E wave velocity and E/A ratio negatively correlated with ejection fraction and positively with pulmonary capillary pressure.
- Doppler parameters were independent of patient age, stenosis severity, and LV hypertrophy.
- Patients with normal pulmonary capillary pressure exhibited abnormal diastolic filling patterns (low E velocity, low E/A ratio, prolonged half pressure time).
- Patients with elevated pulmonary capillary pressure showed normal or high E wave velocities and E/A ratios, with normal or shortened isovolumic relaxation times.
Conclusions:
- Doppler echocardiography provides valuable insights into left ventricular diastolic function in aortic stenosis.
- Diastolic filling patterns assessed by Doppler are significantly influenced by pulmonary capillary pressure.
- These findings support the utility of non-invasive Doppler assessment for evaluating diastolic dysfunction in AS patients.
Abstract:
Doppler echocardiographic parameters of LV diastolic function (isovolumic relaxation time, E wave velocity, ratio of E/A wave velocities, mitral valve pressure half time) were compared to catheter data in 35 patients (average age 67 years) with pure or dominant aortic stenosis (mean gradient: 65 +/- 30 mmHg). The isovolumic relaxation time was prolonged in most patients (m = 103 +/- 23 ms) and seemed uninfluenced by any haemodynamic parameter. There was a positive correlation between pressure half time and ejection fraction (r = 0.41, p = 0.02) and a negative correlation with pulmonary capillary pressure (r = -0.61, p < 0.01). The E and E/A ratio were negatively correlated with the ejection fraction (r = -0.41 and -0.52) and positively correlated with pulmonary capillary pressure (r = 0.46 and 0.62). The Doppler parameters were independant of the patients' age, severity of stenosis and degree of left ventricular hypertrophy. Patients with normal pulmonary capillary pressure (< 15 mmHg, N = 19) had abnormal diastolic filling with low E wave velocities (71 +/- 28 cm/s) and E/A ratios (0.9 +/- 0.6) and prolonged half pressure times (96 +/- 37 ms). Conversely, patients with high pulmonary capillary pressures (> 15 mmHg, N = 16) had normal or high E wave velocities (107 +/- 31 cm/s) and E/A ratios (1.5 +/- 0.6) and normal or shortened isovolumic relaxation times (62 +/- 22 ms).(ABSTRACT TRUNCATED AT 250 WORDS)