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Echocardiographic diastolic ventricular abnormality in hypertensive heart disease: atrial emptying index
Insights
Hypertension can impair left ventricular diastolic properties early, even before other signs appear. The atrial emptying index may detect these diastolic function changes in uncomplicated hypertension.
Area of Science:
- Cardiology
- Hypertension Research
- Diastology
Background:
- Hypertensive heart disease affects left ventricular diastolic properties.
- Early detection of diastolic dysfunction is crucial for managing hypertension.
- Traditional markers may not identify early diastolic changes.
Purpose of the Study:
- To analyze changes in left ventricular diastolic properties in hypertensive heart disease.
- To evaluate the atrial emptying index as an early indicator of diastolic dysfunction.
- To compare diastolic function in normal subjects, hypertensive patients without cardiac involvement, and those with left ventricular hypertrophy.
Main Methods:
- Utilized M-mode echocardiography and systemic hemodynamic data.
- Assessed the atrial emptying index to evaluate rapid diastolic filling.
- Compared three groups: normal subjects, hypertensive patients without cardiac involvement, and hypertensive patients with left ventricular hypertrophy.
Main Results:
- Cardiac index and circumferential fiber shortening were normal across all groups.
- A progressive increase in the left atrial index was observed (p < 0.001).
- A progressive decrease in the atrial emptying index was observed (p < 0.001), indicating reduced rapid left ventricular filling.
Conclusions:
- Reduced rapid left ventricular filling occurs early in hypertension, preceding detectable abnormalities.
- The atrial emptying index serves as an early indicator of diastolic compliance abnormalities.
- This index is valuable for identifying diastolic dysfunction in uncomplicated hypertension.
Abstract:
To analyze changes in left ventricular diastolic properties in hypertensive heart disease, the atrial emptying index was used to assess the rapid phase of diastolic filling of the left ventricle. Ten normal subjects (Group 1), 11 hypertensive patients without evidence of cardiac involvement (Group 2) and 10 hypertensive patients with echocardiographic evidence of left ventricular hypertrophy (Group 3) were compared using M mode echocardiography and systemic hemodynamic data. Whereas cardiac index (dye-dilution method) and rate of circumferential fiber shortening (echocardiogram) were normal in all three groups, there was a progressive increase in left atrial index (p less than 0.001, Group 1 versus Group 2 and versus Group 3) and a progressive decrease in the atrial emptying index (p less than 0.001, Group 1 versus Group 2 and versus Group 3). No correlation existed between the atrial emptying index and the left atrial index, mean arterial pressure or total peripheral resistance in any of the three groups. These data suggest that rapid filling of the left ventricle is reduced early in hypertension, even before electrocardiographic or systolic echocardiographic abnormalities are detectable. The atrial emptying index therefore appears to be an early indicator of abnormalities of left ventricular diastolic compliance in uncomplicated hypertension.