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Echocardiographic observations in hypertension
Insights
Essential hypertension impacts left ventricular function, with abnormal mitral valve patterns indicating impaired or hyperdynamic function. Left ventricular compliance decreases as hypertension severity advances.
Area of Science:
- Cardiology
- Hypertension Research
- Echocardiography
Background:
- Essential hypertension is a significant risk factor for cardiovascular complications.
- Left ventricular (LV) function can be altered in hypertensive patients.
- Echocardiography provides valuable insights into cardiac structure and function.
Purpose of the Study:
- To investigate left ventricular (LV) function and mitral valve patterns in patients with essential hypertension.
- To correlate echocardiographic findings with hypertension severity.
- To explore the relationship between LV dimensions, function, and hypertension grade.
Main Methods:
- Ultrasoundcardiograms (UCG) and radiocardiograms (RCG) were performed on 50 hypertensive patients and 20 controls.
- Patients were categorized into four groups based on hypertension severity.
- Mitral valve echogram patterns, including A wave abnormalities and systolic anterior movement (SAM), were analyzed.
Main Results:
- Ten hypertensive patients exhibited abnormal mitral valve patterns: A wave abnormalities (n=5) suggesting LV dysfunction, and SAM (n=5) suggesting LV hyperfunction with hypertrophy.
- LV septal thickness increased and mitral valve E-F slope decreased with advancing hypertension severity, indicating reduced LV compliance.
- A positive correlation was found between stroke index (SI) measured by UCG and RCG.
Conclusions:
- Specific mitral valve echogram patterns can indicate impaired or hyperdynamic LV function in essential hypertension.
- Hypertension severity is associated with decreased LV compliance and increased septal thickness.
- Factors beyond afterload, such as myocardial ischemia, may significantly influence LV function in hypertension.
Abstract:
Ultrasoundcardiograms (UCG) and radiocardiograms (RCG) were obtained from 50 patients with essential hypertension. They were classified into four groups according to the severity index of Veterans Administration Hospital. These echocardiograms were compared with those obtained from 20 normal individuals. Of the 50 patients with hypertension, ten had abnormal patterns of mitral valve echogram: two had shoulder formation of the A wave (A-A'), three had increased amplitude of the A wave (A greater than E), and five had systolic anterior movement (SAM) of the anterior mitral leaflet toward the ventricular septum. The former two groups were considered to have impairment of left ventricular (LV) function proven by UCG and RCG, however, the SAM group was considered to have hyperfunction with concentric hypertrophy of the left ventricle with thickened ventricular septum simulating that of idiopathic hypertrophic subaortic stenosis (IHSS). This was supported by the fact that SAM increased after inhalation of amyl nitrite and decreased after injection of propranolol. The descent rate of the anterior mitral valve decreased and the thickness of the ventricular septum increased with the severity of hypertension, indicating the LV compliance decreases as the severity of hypertension advances. A significant positive correlation was noted between stroke index (SI) obtained by UCG and RCG. There were no significant differences of LV dimensions and function indices measured by UCG and RCG among the groups classified according to the severity index of hypertension. This suggests that such factors as myocardial ischemia might play an important role in LV function as well as the grade of afterload due to hypertension.