| Frequency domain measures of heart rate variability before the onset of nonsustained and sustained ventricular tachycardia in patients with coronary artery disease. | |
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MedLine Citation:
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PMID: 8462148 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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BACKGROUND: Low heart rate variability (HRV) is associated with an increased risk of arrhythmic death and ventricular tachycardia (VT). The purpose of this study was to examine whether there is a temporal relation between changes in HRV and the onset of spontaneous episodes of VT in patients at high risk of life-threatening arrhythmias. METHODS AND RESULTS: Components of HRV in the frequency domain were analyzed before the onset of 28 episodes of nonsustained VT (more than four impulses; duration < 30 seconds) and 12 episodes of sustained VT (> 30 seconds or requiring defibrillation) in 18 patients with coronary artery disease. Seven patients had survived cardiac arrest not associated with acute myocardial infarction, and 11 had a history of sustained VT. All frequency domain measures of HRV, i.e., total power (p < 0.001), high-frequency power (p < 0.05), low-frequency power (p < 0.01), very-low-frequency power (p < 0.01), and ultralow-frequency power (p < 0.05), were significantly lower before the onset of sustained VT than before nonsustained VT. Total power of HRV was also lower during the 1-hour period before the onset of sustained VT than the average 24-hour HRV (p < 0.05). An indirect correlation existed between the length of VT and the total power of HRV analyzed during the 15 minutes before the onset of VT (r = 0.54, p < 0.01). HRV had a trend toward increasing values before the onset of nonsustained VT (p < 0.01) but not before the sustained VT episodes. The ratio between low-frequency and high-frequency powers increased substantially before both nonsustained and sustained VT episodes (p = 0.06 and p = 0.05, respectively). The rate of VT or the coupling interval initiating the VT did not differ significantly between the nonsustained and sustained VT. CONCLUSIONS: Spontaneous episodes of VT are preceded by changes in HRV in the frequency domain. Divergent dynamics of HRV before the onset of nonsustained and sustained VT episodes may reflect differences in factors that can facilitate the perpetuation of these arrhythmias. |
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Authors:
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H V Huikuri; J O Valkama; K E Airaksinen; T Sepp?nen; K M Kessler; J T Takkunen; R J Myerburg |
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Publication Detail:
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Type: Journal Article; Research Support, Non-U.S. Gov't; Research Support, U.S. Gov't, P.H.S. |
Journal Detail:
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Title: Circulation Volume: 87 ISSN: 0009-7322 ISO Abbreviation: Circulation Publication Date: 1993 Apr |
Date Detail:
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Created Date: 1993-04-30 Completed Date: 1993-04-30 Revised Date: 2010-03-24 |
Medline Journal Info:
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Nlm Unique ID: 0147763 Medline TA: Circulation Country: UNITED STATES |
Other Details:
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Languages: eng Pagination: 1220-8 Citation Subset: AIM; IM |
Affiliation:
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Department of Medicine, Oulu University Central Hospital, Finland. |
Export Citation:
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APA/MLA Format Download EndNote Download BibTex |
| MeSH Terms | |
Descriptor/Qualifier:
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Aged Cardiac Pacing, Artificial Coronary Disease / complications* Electrocardiography, Ambulatory / methods* Female Heart Rate / physiology* Humans Male Middle Aged Risk Factors Signal Processing, Computer-Assisted* Tachycardia, Ventricular / diagnosis*, epidemiology, etiology Time Factors |
| Grant Support | |
ID/Acronym/Agency:
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HL-28130/HL/NHLBI NIH HHS |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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