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Kidney transplant artery stenosis. Interrelationship between blood pressure, kidney function, renin-aldosterone
Insights
Surgical repair of kidney transplant artery stenosis (KTAS) improved kidney function and lowered blood pressure. Sodium retention may offset renin system activity in KTAS, and renin levels don't predict surgical outcomes.
Area of Science:
- Nephrology
- Cardiovascular Surgery
- Hypertension Management
Background:
- Kidney transplant artery stenosis (KTAS) is a complication affecting hypertensive recipients.
- The renin-angiotensin-aldosterone system (RAAS) plays a role in blood pressure regulation and may be implicated in KTAS.
Purpose of the Study:
- To investigate the impact of surgical repair of KTAS on renal function and blood pressure.
- To explore the role of the renin system in hypertensive kidney transplant recipients with KTAS.
Main Methods:
- Observational study of 9 hypertensive kidney transplant recipients with KTAS.
- Assessment of renin system activity, renal plasma flow, glomerular filtration rate, exchangeable sodium, and blood pressure before and after surgical repair in a subset of patients.
Main Results:
- Three out of nine patients showed evidence of increased renin system activity.
- Surgical repair in four recipients led to improved renal plasma flow and glomerular filtration rate.
- Blood pressure and exchangeable sodium decreased post-surgery.
- Peripheral plasma renin and aldosterone levels remained normal pre- and post-operation.
Conclusions:
- Sodium retention might counterbalance increased renin system activity in KTAS.
- Preoperative plasma renin levels do not reliably predict the hypertensive response to surgical KTAS repair.
Abstract:
Among 9 hypertensive recipients with kidney transplant artery stenosis (KTAS) evidence of increased activity of the renin system was present in 3. Surgical repair of KTAS in 4 recipients resulted in an increase in renal plasma flow and glomerular filtration rate associated with a decrease in exchangeable sodium and blood pressure. Peripheral plasma renin and aldosterone values were normal before and after operation in all. It is suggested that sodium retention may counterbalance increased activity of the renin system in KTAS. Preoperative determinations of plasma renin do not predict the effect of surgical repair of KTAS on hypertension.