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Pharmacokinetics and Pharmacodynamics of Inorganic Nitrate in Heart Failure With Preserved Ejection Fraction.

ABSTRACT: RATIONALE:Nitrate-rich beetroot juice has been shown to improve exercise capacity in heart failure with preserved ejection fraction, but studies using pharmacological preparations of inorganic nitrate are lacking. OBJECTIVES:To determine (1) the dose-response effect of potassium nitrate (KNO3) on exercise capacity; (2) the population-specific pharmacokinetic and safety profile of KNO3 in heart failure with preserved ejection fraction. METHODS AND RESULTS:We randomized 12 subjects with heart failure with preserved ejection fraction to oral KNO3 (n=9) or potassium chloride (n=3). Subjects received 6 mmol twice daily during week 1, followed by 6 mmol thrice daily during week 2. Supine cycle ergometry was performed at baseline (visit 1) and after each week (visits 2 and 3). Quality of life was assessed with the Kansas City Cardiomyopathy Questionnaire. The primary efficacy outcome, peak O2-uptake, did not significantly improve (P=0.13). Exploratory outcomes included exercise duration and quality of life. Exercise duration increased significantly with KNO3 (visit 1: 9.87, 95% confidence interval [CI] 9.31-10.43 minutes; visit 2: 10.73, 95% CI 10.13-11.33 minute; visit 3: 11.61, 95% CI 11.05-12.17 minutes; P=0.002). Improvements in the Kansas City Cardiomyopathy Questionnaire total symptom (visit 1: 58.0, 95% CI 52.5-63.5; visit 2: 66.8, 95% CI 61.3-72.3; visit 3: 70.8, 95% CI 65.3-76.3; P=0.016) and functional status scores (visit 1: 62.2, 95% CI 58.5-66.0; visit 2: 68.6, 95% CI 64.9-72.3; visit 3: 71.1, 95% CI 67.3-74.8; P=0.01) were seen after KNO3. Pronounced elevations in trough levels of nitric oxide metabolites occurred with KNO3 (visit 2: 199.5, 95% CI 98.7-300.2 ?mol/L; visit 3: 471.8, 95% CI 377.8-565.8 ?mol/L) versus baseline (visit 1: 38.0, 95% CI 0.00-132.0 ?mol/L; P<0.001). KNO3 did not lead to clinically significant hypotension or methemoglobinemia. After 6 mmol of KNO3, systolic blood pressure was reduced by a maximum of 17.9 (95% CI -28.3 to -7.6) mm?Hg 3.75 hours later. Peak nitric oxide metabolites concentrations were 259.3 (95% CI 176.2-342.4) ?mol/L 3.5 hours after ingestion, and the median half-life was 73.0 (interquartile range 33.4-232.0) minutes. CONCLUSIONS:KNO3 is potentially well tolerated and improves exercise duration and quality of life in heart failure with preserved ejection fraction. This study reinforces the efficacy of KNO3 and suggests that larger randomized trials are warranted. CLINICAL TRIAL REGISTRATION:URL: http://www.clinicaltrials.gov. Unique identifier: NCT02256345.

SUBMITTER: Zamani P

PROVIDER: S-EPMC5376233 | biostudies-literature | 2017 Mar

REPOSITORIES: biostudies-literature

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Pharmacokinetics and Pharmacodynamics of Inorganic Nitrate in Heart Failure With Preserved Ejection Fraction.

Zamani Payman P Tan Victor V Soto-Calderon Haideliza H Beraun Melissa M Brandimarto Jeffrey A JA Trieu Lien L Varakantam Swapna S Doulias Paschalis-Thomas PT Townsend Raymond R RR Chittams Jesse J Margulies Kenneth B KB Cappola Thomas P TP Poole David C DC Ischiropoulos Harry H Chirinos Julio A JA

Circulation research 20161207 7

<h4>Rationale</h4>Nitrate-rich beetroot juice has been shown to improve exercise capacity in heart failure with preserved ejection fraction, but studies using pharmacological preparations of inorganic nitrate are lacking.<h4>Objectives</h4>To determine (1) the dose-response effect of potassium nitrate (KNO<sub>3</sub>) on exercise capacity; (2) the population-specific pharmacokinetic and safety profile of KNO<sub>3</sub> in heart failure with preserved ejection fraction.<h4>Methods and results</ ...[more]

PMID: 27927683

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Project description:BackgroundInorganic nitrate (NO3(-)), abundant in certain vegetables, is converted to nitrite by bacteria in the oral cavity. Nitrite can be converted to nitric oxide in the setting of hypoxia. We tested the hypothesis that NO3(-) supplementation improves exercise capacity in heart failure with preserved ejection fraction via specific adaptations to exercise.Methods and resultsSeventeen subjects participated in this randomized, double-blind, crossover study comparing a single dose of NO3-rich beetroot juice (NO3(-), 12.9 mmol) with an identical nitrate-depleted placebo. Subjects performed supine-cycle maximal-effort cardiopulmonary exercise tests, with measurements of cardiac output and skeletal muscle oxygenation. We also assessed skeletal muscle oxidative function. Study end points included exercise efficiency (total work/total oxygen consumed), peak VO2, total work performed, vasodilatory reserve, forearm mitochondrial oxidative function, and augmentation index (a marker of arterial wave reflections, measured via radial arterial tonometry). Supplementation increased plasma nitric oxide metabolites (median, 326 versus 10 μmol/L; P=0.0003), peak VO2 (12.6±3.7 versus 11.6±3.1 mL O2·min(-1)·kg(-1); P=0.005), and total work performed (55.6±35.3 versus 49.2±28.9 kJ; P=0.04). However, efficiency was unchanged. NO3(-) led to greater reductions in systemic vascular resistance (-42.4±16.6% versus -31.8±20.3%; P=0.03) and increases in cardiac output (121.2±59.9% versus 88.7±53.3%; P=0.006) with exercise. NO3(-) reduced aortic augmentation index (132.2±16.7% versus 141.4±21.9%; P=0.03) and tended to improve mitochondrial oxidative function.ConclusionsNO3(-) increased exercise capacity in heart failure with preserved ejection fraction by targeting peripheral abnormalities. Efficiency did not change as a result of parallel increases in total work and VO2. NO3(-) increased exercise vasodilatory and cardiac output reserves. NO3(-) also reduced arterial wave reflections, which are linked to left ventricular diastolic dysfunction and remodeling.Clinical trial registration urlwww.clinicaltrials.gov. Unique identifier: NCT01919177.

Project description:BackgroundVericiguat, a stimulator of soluble guanylate cyclase, has been developed as a first-in-class therapy for worsening chronic heart failure in adults with left ventricular ejection fraction < 45%.ObjectiveThe objective of this article was to characterize the pharmacokinetics and pharmacokinetic variability of vericiguat combined with guideline-directed medical therapy (standard of care), and identify exposure-response relationships for safety (hemodynamics) and pharmacodynamic markers of efficacy (N-terminal pro-B-type natriuretic peptide concentration [NT-proBNP]) in patients with heart failure and left ventricular ejection fraction < 45% in the SOCRATES-REDUCED study (NCT01951625).MethodsVericiguat and NT-proBNP plasma concentrations in 454 and 432 patients in SOCRATES-REDUCED, respectively, were analyzed using nonlinear mixed-effects modeling.ResultsVericiguat pharmacokinetics were well described by a one-compartment model with apparent clearance, apparent volume of distribution, and absorption rate constant. Age, bodyweight, plasma bilirubin, and creatinine clearance were identified as significant covariates on apparent clearance; sex and bodyweight on apparent volume of distribution; and bodyweight and plasma albumin level on absorption rate constant. Pharmacokinetic/pharmacodynamic analysis showed initial minor and transient effects of vericiguat on blood pressure with low clinical impact. There were no changes in heart rate following initial or repeated vericiguat administration. An exposure-dependent and time-dependent turnover pharmacokinetic/pharmacodynamic model for NT-proBNP described production and elimination rates and an demonstrated exposure-dependent reduction in [NT-proBNP] by vericiguat plus standard of care compared with placebo plus standard of care. This effect was dependent on baseline [NT-proBNP].ConclusionsVericiguat has predictable pharmacokinetics, with no long-term effects on blood pressure in patients with heart failure and left ventricular ejection fraction < 45%. A pharmacokinetic/pharmacodynamic model described a vericiguat exposure-dependent reduction of NT-proBNP.Clinical trial identifierNCT01951625.

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Pharmacokinetics and Pharmacodynamics of Inorganic Nitrate in Heart Failure With Preserved Ejection Fraction.

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Pharmacokinetics and Pharmacodynamics of Inorganic Nitrate in Heart Failure With Preserved Ejection Fraction.

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