title: Excessive ventilation during early phase of exercise: a new predictor of poor long-term outcome in patients with chronic heart failure.
abstract: BACKGROUND
  Studies demonstrating prognostic value of excessive exercise ventilation in chronic heart failure (CHF) have focused on data derived from the whole cardiopulmonary exercise test (CPET). Whether ventilatory response to early phase of exercise is useful for risk stratification in CHF is unknown.
  
  
  RESULTS
  We evaluated 216 patients with systolic CHF who underwent CPET (age: 60+/-11 years, NYHA class [I/II/III/IV]: 18/104/77/17). Ventilatory response to exercise (slope of regression line relating ventilation to carbon dioxide production) was calculated from the whole exercise test (VE-VCO(2)-all) and from the first 3 min of exercise (early phase - VE-VCO(2)-3 min). During follow-up (mean: 40+/-20 months, >3 years in survivors), 89 (41%) CHF patients died. High VE-VCO(2)-all and VE-VCO(2)-3 min predicted poor outcome in single predictor analyses, and in multivariable models when adjusted for prognosticators (age, NYHA class, ejection fraction, peak VO(2)) (P<0.0001). In receiver operating characteristic curve analysis, areas under curve for 3-year follow-up were similar for VE-VCO(2)-all and VE-VCO(2)-3 min. VE-VCO(2)-3 min maintained its prognostic value in patients taking beta-blockers (P<0.0001) and those unable to perform maximal CPET (P=0.0009).
  
  
  CONCLUSIONS
  In CHF patients, excessive ventilation assessed over the first 3 min predicts poor outcome. Assessment of ventilatory response to exercise for prognostic stratification may be extended to patients unable to perform maximal CPET.
authors: Cardiology Department, Military Hospital, Weigla 5, 50-981 Wroclaw, Poland.
authors: Ewa A
authors: EA
authors: Jankowska
authors: Tomasz
authors: T
authors: Witkowski
authors: Beata
authors: B
authors: Ponikowska
authors: Krzysztof
authors: K
authors: Reczuch
authors: Ludmila
authors: L
authors: Borodulin-Nadzieja
authors: Stefan D
authors: SD
authors: Anker
authors: Massimo F
authors: MF
authors: Piepoli
authors: Waldemar
authors: W
authors: Banasiak
authors: Piotr
authors: P
authors: Ponikowski
mesh_terms: D000368:Aged; D002908:Chronic Disease; D005080:Exercise Test; D005081:Exercise Therapy; D005260:Female; D054143:Heart Failure, Systolic / Q000401:mortality / Q000628:therapy*; D006801:Humans; D008297:Male; D008875:Middle Aged; D010101:Oxygen Consumption / Q000502:physiology; D011379:Prognosis; D011446:Prospective Studies; D012123:Pulmonary Ventilation / Q000502:physiology*; D013318:Stroke Volume; D013997:Time Factors; D016896:Treatment Outcome; D014692:Ventilation-Perfusion Ratio / Q000502:physiology