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[Plasma renin activity, plasma volume extracellular fluid volume and cardiac output in essential hypertension
Insights
Essential hypertension patients with low plasma renin activity (PRA) are not a single group. Some may have high blood pressure causing suppressed PRA, indicating varied hypertension mechanisms.
Area of Science:
- Cardiovascular Medicine
- Endocrinology
- Nephrology
Context:
- Essential hypertension is a common condition with complex pathophysiology.
- Plasma renin activity (PRA) is a key regulator of blood pressure.
- Understanding subgroups within essential hypertension is crucial for effective treatment.
Purpose:
- To investigate the characteristics of essential hypertension patients with low plasma renin activity (PRA).
- To determine if low PRA in essential hypertension is associated with specific hemodynamic profiles.
- To explore potential mechanisms underlying low PRA in hypertensive individuals.
Summary:
- This study analyzed plasma renin activity (PRA), plasma volume (PV), extracellular fluid volume (ECV), cardiac output, and total peripheral resistance (TPR) in 51 essential hypertension patients.
- Approximately 18% of patients exhibited low and non-sensitive PRA.
- Despite low PRA, these patients did not differ significantly in PV, ECV, cardiac output, or TPR compared to those with normal/elevated PRA, but presented with the highest average arterial pressure.
Impact:
- Identifies essential hypertension patients with low PRA as a heterogeneous group.
- Suggests that in some cases, elevated blood pressure may lead to renin suppression.
- Highlights the need for personalized approaches in managing hypertension based on renin levels and associated factors.
Abstract:
The plasma renin activity (PRA), the plasma volume (PV), the extracellular fluid volume (ECV), the cardiac output and the peripheral vascular resistance (TPR) were determined in 51 patients (14 women, 37 men) with essential hypertension of varying severity. The following findings were achieved: 1. In 9 of the 51 patients with essential hypertension (approximately 18%) a low and non-sensitive PRA was detected. 2. PV, ECV, cardiac output and the calculated peripheral vascular resistance of the essential hypertensive patients with low and non-sensitive PRA did not differ significantly from those of the essential hypertensive patients with normal or elevated PRA. 3. The hypertensive patients with low and nonsensitive PRA had the highest average arterial pressure. From these findings it can be concluded that the essential hypertensive patients with low PRA are not an homogeneous group. It is assumed that in a subgroup the elevated blood pressure may be the cause of the renin suppression.