doi: 10.1161/hc3101.093699
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(Circulation. 2001;104:544.)
© 2001 American Heart Association, Inc.
Clinical Investigation and Reports |
Peripheral Chemoreceptor Hypersensitivity
An Ominous Sign in Patients With Chronic Heart Failure
From Clinical Cardiology, NHLI, London, UK (P.P., T.P.C., S.D.A., D.P.F., W.D., P.A.P.-W., M.F.P., A.J.S.C.); the Cardiology Department, Clinical Military Hospital, Wroclaw, Poland (P.P., W.B.); and the Franz-Volhard-Klinik (Charité, Campus Berlin-Buch) at Max-Delbrück-Centrum, Berlin, Germany (S.D.A.).
Correspondence to Dr Piotr Ponikowski, MD, PhD, Clinical Cardiology, NHLI, Dovehouse St, London SW3 6LY, UK. E-mail piotrponikowski{at}hotmail.com
Background— Peripheral chemoreceptor hypersensitivity is a feature of abnormal cardiorespiratory reflex control in chronic heart failure (CHF) and may contribute to sympathetic overactivity, attenuated baroreflex sensitivity (BRS), and excessive ventilation during exercise. We studied whether augmented peripheral chemosensitivity carries independent prognostic significance.
Methods and Results— We assessed peripheral chemosensitivity (ventilatory response to hypoxia using transient inhalation of pure nitrogen) and BRS (phenylephrine and spectral methods) in 80 consecutive CHF patients (age 58±9 years; left ventricular ejection fraction [LVEF] 24±12%; peak oxygen consumption [peak 
O2] 18±7 mL-1 · min-1). CHF patients demonstrated augmented peripheral chemosensitivity and decreased BRS (all P<0.01 versus reference values). During follow-up (median 41 months, >3 years in all survivors), 37 patients died. High peripheral chemosensitivity (>0.72 L · min-1 · %SaO2-1) predicted impaired survival (hazard ratio 3.2, 95% CI 1.6 to 6.0, P=0.0006). In the 27 patients (34%) with high peripheral chemosensitivity, 3-year survival was 41% (95% CI 22% to 60%) compared with 77% (66% to 89%) in 53 patients with normal chemosensitivity (P=0.0002). In multivariate analyses, augmented chemosensitivity independently predicted death (hazard ratio 2.8, 95% CI 1.5 to 5.5, adjusted for age, peak O2, and E/CO2 [P=0.002]; hazard ratio 2.6, 95% CI 1.3 to 5.1, adjusted for age, LVEF, and peak O2 [P=0.008]). Depressed BRS was related to unfavorable prognosis in univariate analysis (P=0.05) but not in multivariate analyses.
Conclusions— Hypersensitivity of the peripheral chemoreceptors independently predicts adverse prognosis in ambulatory patients with CHF. This hyperactive excitatory reflex, through its inhibitory effect on the baroreflex, may be the reason for the previously observed prognostic association of the latter.
Key Words: peripheral chemoreceptors • heart failure • baroreceptors • prognosis
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