Sodium Nitrite Improves Exercise Hemodynamics and Ventricular Performance in Heart Failure With Preserved Ejection...

Area of Science:

• Cardiology
• Pharmacology
• Physiology

Background:

• Heart failure with preserved ejection fraction (HFpEF) lacks effective medical treatments.
• Patients with HFpEF experience elevated pulmonary capillary wedge pressure (PCWP) during exercise.
• Impaired nitric oxide (NO) signaling is observed in HFpEF, and nitrite can be converted to NO.

Purpose of the Study:

• To investigate if acute nitrite administration can enhance exercise hemodynamics and cardiac reserve in HFpEF patients.
• To assess the impact of nitrite on PCWP and cardiac output during exertion.

Main Methods:

• A double-blind, randomized, placebo-controlled trial involving 28 HFpEF subjects.
• Invasive cardiac catheterization and expired gas analysis were performed at rest and during exercise.
• Measurements were taken before and after treatment with sodium nitrite or placebo.

Main Results:

• Sodium nitrite significantly reduced exercise-induced PCWP compared to placebo (19 ± 5 mm Hg vs. 28 ± 6 mm Hg).
• Nitrite administration improved cardiac output reserve during exercise (+0.5 ± 0.7 l/min vs. -0.4 ± 0.7 l/min).
• Nitrite enhanced ventricular performance and improved pulmonary artery pressure-flow relationships.

Conclusions:

• Acute sodium nitrite infusion effectively mitigates exercise-induced hemodynamic abnormalities in HFpEF.
• These findings support further investigation into long-term nitrite therapy for HFpEF.
• Prospective trials are warranted to evaluate the long-term efficacy of nitrite in HFpEF management.