Assessment of dyspnea in acute decompensated heart failure: insights from ASCEND-HF (Acute Study of Clinical Effectiveness of Nesiritide in Decompensated Heart Failure) on the contributions of peak expiratory flow.

Published

Journal Article

OBJECTIVES: This study hypothesized that peak expiratory flow rate (PEFR) would increase with acute heart failure (AHF) treatment over the first 24 h, related to a Dyspnea Index (DI) change and treatment effect. BACKGROUND: Dyspnea is a key symptom and clinical trial endpoint in AHF, yet objective assessment is lacking. METHODS: In a clinical trial substudy, 421 patients (37 sites) underwent PEFR testing at baseline, 1, 6, and 24 h after randomization to nesiritide or placebo. DI (by Likert scale) was collected at hours 6 and 24. RESULTS: Patients were median age 70 years, and 34% were female; no significant differences between nesiritide or placebo patients existed. Median baseline PEFR was 225 l/min (interquartile range [IQR]: 160 to 300 l/min) and increased to 230 l/min (2.2% increase; IQR: 170 to 315 l/min) by hour 1, 250 l/min (11.1% increase; IQR: 180 to 340 l/min) by hour 6, and 273 l/min (21.3% increase; IQR: 200 to 360 l/min) by 24 h (all p < 0.001). The 24-h PEFR change related to moderate or marked dyspnea improvement by DI (adjusted odds ratio: 1.04 for each 10 l/min improvement [95% confidence interval (CI): 1.07 to 1.10]; p < 0.01). A model incorporating time and treatment over 24 h showed greater PEFR improvement after nesiritide compared with placebo (p = 0.048). CONCLUSIONS: PEFR increases over the first 24 h in AHF and could serve as an AHF endpoint. Nesiritide had a greater effect than placebo on PEFR, and this predicted patients with moderate/marked improvement in dyspnea, thereby providing an objective metric for assessing AHF. (Acute Study of Clinical Effectiveness of Nesiritide in Decompensated Heart Failure [ASCEND-HF]; NCT00475852).

Full Text

Duke Authors

Cited Authors

  • Ezekowitz, JA; Hernandez, AF; O'Connor, CM; Starling, RC; Proulx, G; Weiss, MH; Bakal, JA; Califf, RM; McMurray, JJV; Armstrong, PW

Published Date

  • April 17, 2012

Published In

Volume / Issue

  • 59 / 16

Start / End Page

  • 1441 - 1448

PubMed ID

  • 22497823

Pubmed Central ID

  • 22497823

Electronic International Standard Serial Number (EISSN)

  • 1558-3597

Digital Object Identifier (DOI)

  • 10.1016/j.jacc.2011.11.061

Language

  • eng

Conference Location

  • United States