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Renal and systemic hemodynamics in borderline hypertension
G M London1, M E Safar, Y A Weiss
1Diagnosis Center, Broussais Hospital, Paris, France.
Insights
Young patients with borderline hypertension showed increased cardiac output and renal blood flow, but no signs of renal ischemia. This suggests normal kidney function despite elevated blood pressure markers in this age group.
Area of Science:
- Cardiovascular Physiology
- Renal Physiology
- Hypertension Research
Background:
- Borderline hypertension in young individuals is a growing concern.
- Understanding renal hemodynamics is crucial for assessing cardiovascular risk.
- Previous studies have yielded conflicting results on renal function in pediatric hypertension.
Purpose of the Study:
- To investigate cardiac output (CO) and renal blood flow (RBF) in young patients with borderline hypertension.
- To compare hemodynamic parameters between hypertensive and normotensive youth.
- To determine the presence or absence of renal ischemia in this cohort.
Main Methods:
- Prospective study comparing 29 young patients with borderline hypertension to 26 age- and sex-matched normotensive controls.
- Measurement of cardiac output (CO) using established methods.
- Assessment of renal blood flow (RBF) and glomerular filtration rate (GFR).
Main Results:
- Patients with borderline hypertension exhibited significantly increased CO and RBF compared to controls.
- The renal blood flow to cardiac output ratio (RBF/CO) was maintained within normal limits.
- No significant alterations in glomerular filtration rate (GFR) or renal filtration fraction were detected.
Conclusions:
- Young individuals with borderline hypertension demonstrate elevated cardiac output and renal blood flow.
- The absence of changes in the RBF/CO ratio and normal GFR indicates no renal ischemia.
- These findings suggest preserved renal perfusion in youth with early-stage hypertension.
Abstract:
Cardiac output (CO), renal blood flow (RBF), and glomerular filtration rate were measured in 29 young patients with borderline hypertension, in comparison with 26 normotensive controls of the same age and sex. In patients with borderline hypertension, both CO and RBF were significantly increased, whereas the RBF/CO ratio remained within the normal range. No significant changes in glomerular filtration rate and renal filtration fraction were observed. The study clearly demonstrated that renal ischemia was absent in young patients with borderline hypertension.