Related Experiment Videos
Renal resistive index after captopril test by echo-Doppler in essential hypertension
Insights
The renal resistive index, measured by Doppler ultrasound, is higher in moderate to severe hypertension. Captopril testing revealed significant changes in normotensives and mild hypertensives, indicating its utility in assessing renal vascular impedance.
Area of Science:
- Nephrology
- Cardiology
- Radiology
Background:
- Essential hypertension is a leading cause of chronic kidney disease.
- Assessing renal vascular changes is crucial for managing hypertensive complications.
- Doppler ultrasound offers a non-invasive method to evaluate renal hemodynamics.
Purpose of the Study:
- To evaluate the renal resistive index (RI) in patients with essential hypertension.
- To assess the impact of captopril on renal vascular impedance.
- To correlate RI with hypertension severity and duration.
Main Methods:
- Doppler ultrasound was used to measure the renal resistive index in 45 hypertensive patients and 15 controls.
- Measurements were taken at baseline and after oral administration of 50 mg captopril.
- Statistical analyses included univariate and multivariate correlations.
Main Results:
- Baseline renal resistive index was significantly higher in moderate and severe hypertensives compared to mild hypertensives and controls (P < .05).
- Following captopril, the renal resistive index increased significantly in normotensives and mild hypertensives (P < .05).
- Hypertension duration and severity correlated with increased resistive index under both basal and dynamic conditions.
Conclusions:
- The renal resistive index, assessed via echo-Doppler, provides valuable information on renal vascular impedance in essential hypertension.
- This index can aid in detecting the progression of hypertensive disease and associated renal arteriolar damage.
- Doppler ultrasound assessment of renal resistive index is a promising tool for hypertensive patient management.
Abstract:
In 45 patients with essential hypertension and 15 age-matched normotensive control subjects, the renal resistive index, as an expression of arterial impedance, was determined using Doppler ultrasound. In both kidneys the resistive index was assessed at baseline and after captopril test (50 mg orally). In the moderate and severe hypertensives, compared to mild hypertensives and control subjects, the baseline resistive index was significantly higher (P less than .05). Following captopril, the resistive index increased only in normotensives (P less than .05) and in mild hypertensives (P less than .05). Univariate and multivariate analyses show that the duration and severity of hypertension correlated with an increase of the resistive index both in basal and in dynamic conditions. Thus, the use of the resistive index, as determined by echo-Doppler, could provide useful information for the assessment of renal vascular impedance in essential hypertensive patients. This would help us detect the evolution of hypertensive disease to the higher degrees of severity that are correlated to renal arteriolar damage.