| Mental stress may induce QT-interval prolongation and T-wave notching. | |
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MedLine Citation:
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PMID: 17617071 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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BACKGROUND: The effects of active and passive mental stress (PMS) on the QT interval were studied by using an intraindividual regression method of QT-interval correction for heart rate. METHODS: Thirty healthy males (age 21.2 +/- 1.8 years) performed a mental arithmetic for 1 minute, which was considered as active mental stress (AMS) because of the performance requirement. A 1-minute unpleasant video clip was used for PMS. Two baseline and two (an early and a late) ECGs were prepared in both mental stress periods. The individual QT-RR relationship was assessed by linear regression analysis of 7-15 (11.0 +/- 1.9) controlled QT-RR data pairs, also obtained from ECGs gained during a successive set of 9 isometric stretching exercises. RESULTS: Heart rate has increased significantly at both measurements in response to AMS (P < 0.0001), but not in response to passive stress. QTc significantly prolonged early in AMS (P = 0.0004), then normalized by the end of the period. During PMS, no significant QTc changes were observed. The evolution of bifid T waves was noted in 14 subjects: 8 presented bifid T waves during both AMS and exercise, and 6 during only exercise. CONCLUSIONS: AMS and PMS elicit different cardiovascular reactions. Our results indicate that changes in the autonomic tone, probably abrupt sympathetic predominance, may cause QTc prolongation and bifid T waves. This suggests that besides stress quality and intensity, the dynamics of stress application and perception also influence repolarization. |
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Authors:
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Gábor Andrássy; Attila Szabo; Gyöngyvér Ferencz; Zsófia Trummer; Eszter Simon; Adám Tahy |
Publication Detail:
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Type: Journal Article |
Journal Detail:
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Title: Annals of noninvasive electrocardiology : the official journal of the International Society for Holter and Noninvasive Electrocardiology, Inc Volume: 12 ISSN: 1082-720X ISO Abbreviation: Ann Noninvasive Electrocardiol Publication Date: 2007 Jul |
Date Detail:
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Created Date: 2007-07-09 Completed Date: 2007-09-27 Revised Date: 2008-03-10 |
Medline Journal Info:
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Nlm Unique ID: 9607443 Medline TA: Ann Noninvasive Electrocardiol Country: United States |
Other Details:
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Languages: eng Pagination: 251-9 Citation Subset: IM |
Affiliation:
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Department of Cardiology, Saint Francis Hospital, Budapest, Hungary. andrassy.gabor@t-online.hu |
Export Citation:
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| MeSH Terms | |
Descriptor/Qualifier:
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Adult Electrocardiography* Exercise Test Heart Rate / physiology Humans Long QT Syndrome / physiopathology* Male Stress, Psychological / physiopathology* |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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