Sequential nephron blockade with combined diuretics improves diastolic function in patients with resistant...

Area of Science:

• Cardiology
• Nephrology
• Pharmacology

Background:

• Hypertension is a primary cause of cardiac diastolic dysfunction.
• Current treatments for hypertension do not always restore cardiac function.
• The independent effects of different antihypertensive strategies on cardiac parameters require further investigation.

Purpose of the Study:

• To compare the impact of sequential nephron blockade (NBD) using diuretics versus sequential renin-angiotensin system blockade (RASB) on cardiac parameters in patients with resistant hypertension.

Main Methods:

• 140 patients with resistant hypertension were randomized to either NBD or RASB regimens.
• Treatment intensity was escalated based on home blood pressure (BP) readings.
• Cardiac parameters, including BP, BNP levels, and echocardiographic measures, were assessed at baseline and after 12 weeks.

Main Results:

• The NBD group showed a significant decrease in BNP levels (-43%) and diastolic dysfunction criteria (31% to 3%).
• The RASB group experienced an increase in BNP levels (+55%) and diastolic dysfunction criteria (19% to 32%).
• NBD led to greater reductions in systolic BP, pulse pressure, and systemic vascular resistance compared to RASB.

Conclusions:

• Sequential nephron blockade with diuretics significantly improves cardiac markers of diastolic dysfunction in resistant hypertension.
• This improvement is independent of blood pressure reduction.
• NBD is a promising strategy for managing cardiac diastolic dysfunction in resistant hypertension.