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The effect of triple drug therapy on renal function in patients with essential hypertension
Insights
Triple drug therapy effectively controls hypertension but may reduce kidney function. This study found reduced glomerular filtration rate and renal blood flow in patients on this regimen.
Area of Science:
- Nephrology
- Cardiovascular Medicine
- Pharmacology
Background:
- Long-term effects of triple drug therapy on renal function in moderate to severe essential hypertension are not well understood.
- Essential hypertension poses significant risks to renal health.
Purpose of the Study:
- To prospectively evaluate the impact of a specific triple drug antihypertensive regimen on renal function.
- To assess changes in glomerular filtration rate, renal plasma flow, and renal blood flow.
Main Methods:
- Fifteen male patients with moderate to severe essential hypertension were studied for 16 weeks.
- The regimen included metolazone, atenolol/betaxolol, and minoxidil, with potassium supplementation.
- Renal function was assessed using inulin and para-aminohippurate clearance.
Main Results:
- Systemic blood pressure was well controlled.
- Glomerular filtration rate, effective renal plasma flow, and renal blood flow were significantly reduced.
- Plasma renin activity remained stimulated, and serum potassium levels were low despite supplementation.
Conclusions:
- Triple drug therapy (diuretic, beta-blocker, vasodilator) effectively controls moderate to severe hypertension.
- This antihypertensive regimen may be associated with a decline in renal function.
- Further research is needed to optimize this therapy for renal preservation.
Abstract:
The effects of long-term triple drug therapy on renal function in patients with moderate to severe essential hypertension have not been evaluated systematically. We prospectively studied fifteen male patients with moderate to severe essential hypertension receiving triple drug therapy (metolazone, atenolol or betaxolol, and minoxidil) for 16 weeks. Supplemental potassium was prescribed in an attempt to maintain serum potassium above 3.5 mEq/liter. Systemic blood pressure was well controlled with this regimen. However, glomerular filtration rate (assessed by inulin clearance), effective renal plasma flow (assessed by paraaminohippurate clearance), and renal blood flow were reduced. Filtration fraction and renal vascular resistance were not significantly altered. Plasma renin activity remained stimulated throughout the protocol. Weight gain occurred, and serum potassium remained low. These results suggest that triple drug therapy employing a diuretic, beta-adrenergic antagonist, and a potent vasodilator is effective therapy for controlling moderate to severe systemic hypertension. However this antihypertensive regimen may be associated with a decrement in renal function.