Predicting blood pressure response after renal artery stenting

Area of Science:

• Nephrology
• Cardiology
• Vascular Surgery

Background:

• Renal artery stenting (RAS) for renovascular hypertension (RVH) has high technical success but variable clinical outcomes.
• Predicting patient response to RAS is crucial for improving overall procedure success and durability.

Purpose of the Study:

• To identify predictors of blood pressure improvement after RAS in patients with RVH.
• To evaluate the impact of baseline renal function on long-term outcomes following RAS.

Main Methods:

• Retrospective analysis of 129 patients undergoing RAS for RVH between 2001 and 2007.
• Primary outcome: blood pressure improvement/cure. Secondary outcomes: estimated glomerular filtration rate (eGFR), medication count, survival.
• Multivariate analysis to identify factors associated with blood pressure response.

Main Results:

• Significant improvements observed in systolic blood pressure (161 to 144 mm Hg), diastolic blood pressure (80 to 73 mm Hg), and antihypertensive medication count.
• A baseline eGFR <40 mL/min/1.73 m2 and female gender were independent predictors of failure to achieve blood pressure improvement.
• Sustained blood pressure improvement at 2-4 years was significantly higher in patients with baseline eGFR ≥40 mL/min/1.73 m2 (67%) compared to those with eGFR <40 mL/min/1.73 m2 (31%).

Conclusions:

• Patients with a baseline eGFR of ≥40 mL/min/1.73 m2 demonstrate a better and more sustained response to RAS for RVH.
• Baseline renal function is a critical factor in predicting the long-term clinical success of renal artery stenting.