Document Detail

Cardiac resynchronization therapy improves heart rate profile and heart rate variability of patients with moderate to severe heart failure.
MedLine Citation:
PMID:  16286175     Owner:  NLM     Status:  MEDLINE    
OBJECTIVES: This study sought to report long-term changes of cardiac autonomic control by continuous, device-based monitoring of the standard deviation of the averages of intrinsic intervals in the 288 five-min segments of a day (SDANN) and of heart rate (HR) profile in heart failure (HF) patients treated with cardiac resynchronization therapy (CRT). BACKGROUND: Data on long-term changes of time-domain parameters of heart rate variability (HRV) and of HR in highly symptomatic HF patients treated with CRT are lacking. METHODS: Stored data were retrieved for 113 HF patients (New York Heart Association functional class III to IV, left ventricular ejection fraction < or =35%, QRS >120 ms) receiving a CRT device capable of continuous assessment of HRV and HR profile. RESULTS: The CRT induced a reduction of minimum HR (from 63 +/- 9 beats/min to 58 +/- 7 beats/min, p < 0.001) and mean HR (from 76 +/- 10 beats/min to 72 +/- 8 beats/min, p < 0.01) and an increase of SDANN (from 69 +/- 23 ms to 93 +/- 27 ms, p < 0.001) at three-month follow-up, which were consistent with improvement of functional capacity and structural changes. Different kinetics were observed among these parameters. The SDANN reached the plateau before minimum HR, and mean HR was the slowest parameter to change. Suboptimal left ventricular lead position was associated with no significant functional and structural improvement as well as no change or even worsening of HRV. The two-year event-free survival rate was significantly lower (62% vs. 94%, p < 0.005) in patients without any SDANN change (Delta change < or =0%) compared with patients who showed an increase in SDANN (Delta change >0%) four weeks after CRT initiation. CONCLUSIONS: Cardiac resynchronization therapy is able to significantly modify the sympathetic-parasympathetic interaction to the heart, as defined by HR profile and HRV. Lack of HRV improvement four weeks after CRT identifies patients at higher risk for major cardiovascular events.
Cecilia Fantoni; Santi Raffa; Francois Regoli; Francesco Giraldi; Maria Teresa La Rovere; John Prentice; Francesca Pastori; Simona Fratini; Jorge A Salerno-Uriarte; Helmut U Klein; Angelo Auricchio
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Publication Detail:
Type:  Journal Article     Date:  2005-10-24
Journal Detail:
Title:  Journal of the American College of Cardiology     Volume:  46     ISSN:  1558-3597     ISO Abbreviation:  J. Am. Coll. Cardiol.     Publication Date:  2005 Nov 
Date Detail:
Created Date:  2005-11-15     Completed Date:  2005-12-29     Revised Date:  2007-11-15    
Medline Journal Info:
Nlm Unique ID:  8301365     Medline TA:  J Am Coll Cardiol     Country:  United States    
Other Details:
Languages:  eng     Pagination:  1875-82     Citation Subset:  AIM; IM    
Division of Cardiology, University Hospital, Magdeburg, Germany.
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MeSH Terms
Heart Failure / physiopathology*,  therapy*
Heart Rate*
Middle Aged
Pacemaker, Artificial*
Severity of Illness Index
Comment In:
J Am Coll Cardiol. 2006 Sep 19;48(6):1285-6; author reply 1286   [PMID:  16979024 ]

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