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Left ventricular structural characteristics in unilateral renovascular hypertension and primary aldosteronism
Insights
Hypertension impacts heart structure differently based on its cause. While renin-angiotensin system and plasma volume influence left ventricular hypertrophy, similar cardiac anatomy was observed between renovascular hypertension and primary aldosteronism groups.
Area of Science:
- Cardiology
- Hypertension Research
- Cardiac Anatomy
Background:
- The renin-angiotensin system and plasma volume are key factors in hypertensive left ventricular hypertrophy.
- Understanding the anatomical differences in left ventricular hypertrophy is crucial for managing hypertension.
Purpose of the Study:
- To assess the role of the renin-angiotensin system and plasma volume in hypertensive left ventricular hypertrophy.
- To compare the cardiac anatomy in patients with unilateral renovascular hypertension and primary aldosteronism.
Main Methods:
- Echocardiography was used to study 19 patients with unilateral renovascular hypertension and 19 with primary aldosteronism.
- Patients were matched for blood pressure, age, and sex.
- Plasma volume and left ventricular dimensions were analyzed.
Main Results:
- Plasma volume was elevated in primary aldosteronism patients.
- Left ventricular hypertrophy and anatomy were similar between groups, except for an increased left ventricular end-diastolic dimension index in primary aldosteronism.
- Systolic blood pressure correlated with left ventricular mass index and relative wall thickness.
Conclusions:
- Despite similar blood pressure, age, and sex, primary aldosteronism is associated with increased left ventricular end-diastolic dimension.
- Left ventricular hypertrophy and anatomy are largely similar in renovascular hypertension and primary aldosteronism at comparable blood pressure levels.
Abstract:
To assess the importance of the renin-angiotensin system and plasma volume as determinants of hypertensive left ventricular hypertrophy and its anatomy, patients with unilateral renovascular hypertension and primary aldosteronism were studied by echocardiography. Blood pressure, age and sex were matched as closely as possible. The 19 patients with unilateral renovascular hypertension and the 19 patients with primary aldosteronism were similar in age, sex and blood pressure (168 +/- 19/97 +/- 11 and 163 +/- 17/99 +/- 10 mm Hg, respectively), but plasma volume was increased in the patients with primary aldosteronism. Interventricular septal thickness, left ventricular posterior wall thickness, left ventricular mass index and relative wall thickness did not differ between the 2 groups of patients. There was a significant correlation between the level of systolic blood pressure and either left ventricular mass index (r = 0.34, p less than 0.05) or relative wall thickness (r = 0.58, p less than 0.001) in both groups of patients. Left ventricular end-diastolic dimension index was increased in the patients with primary aldosteronism compared with those with unilateral renovascular hypertension (3.2 +/- 0.4 vs 2.9 +/- 0.3 cm/m2, p less than 0.02). When confined to the patients with systolic pressure greater than or equal to 150 mm Hg, relative wall thickness was significantly increased in the patients with unilateral renovascular hypertension. Patients with primary aldosteronism and unilateral renovascular hypertension of similar blood pressure levels, age and sex have almost identical degrees of left ventricular hypertrophy and anatomy. In contrast, the patients with primary oldosteronism had increased left ventricular dimension index.(ABSTRACT TRUNCATED AT 250 WORDS)