Search: onr:"swepub:oai:DiVA.org:umu-6814" >
ST-segment deviatio...
-
Häggmark, SörenUmeå universitet,Anestesiologi och intensivvård
(author)
ST-segment deviations during pacing-induced increased heart rate in patients without coronary artery disease.
- Article/chapterEnglish2005
Publisher, publication year, extent ...
-
2005
-
electronicrdacarrier
Numbers
-
LIBRIS-ID:oai:DiVA.org:umu-6814
-
https://urn.kb.se/resolve?urn=urn:nbn:se:umu:diva-6814URI
-
https://doi.org/10.1111/j.1475-097X.2005.00613.xDOI
Supplementary language notes
-
Language:English
-
Summary in:English
Part of subdatabase
Classification
-
Subject category:ref swepub-contenttype
-
Subject category:art swepub-publicationtype
Notes
-
INTRODUCTION: In order to interpret ST-segment changes as an indicator of ischemia in patients with higher heart rates (HRs), the relation between ST-segment levels and HR needs to be well defined in subjects without coronary artery disease. METHODS: Eighteen patients with normal ECGs in the catheterization laboratory, after radiofrequency ablation of AV nodal re-entry tachycardia or an accessory pathway were included. Computerized online vectorcardiography (VCG) was performed during step-wise atrial pacing-induced increases in HR up to 150 beats min(-1) (bpm). The ST-vector magnitude (ST-VM) and the relative ST change vector magnitude (STC-VM) were analysed at the J point, J + 20 and J + 60 ms. RESULTS: There was no divergence in the course of ST-VM or STC-VM based on J point + 0, 20, or 60 ms during increasing HR. The STC-VM mean values increased progressively during increases in HR above 100 bpm, with an average increase in STC-VM of 15-20 microV per 10 bpm increases in HR. The ST-VM response during HR increases showed a heterogeneous and unpredictable pattern. CONCLUSION: The STC-VM increases linearly with rising HRs above 100 bpm. The STC-VM can exceed widely recognized ischemic thresholds during higher HRs in the absence of ischemia. The choice of J point time to ST-VM measurements as tested here is not important for the STC-VM relation to HR at these HR levels. Further clinical testing is needed to improve the diagnostic specificity of STC-VM measurements during increased HRs.
Subject headings and genre
-
Adult
-
Arrhythmias; Cardiac/*diagnosis/*physiopathology/therapy
-
Cardiac Pacing; Artificial/*methods
-
Coronary Disease/diagnosis/physiopathology/therapy
-
Female
-
Heart Rate
-
Humans
-
Male
-
Middle Aged
-
Statistics as Topic
-
Vectorcardiography/*methods
Added entries (persons, corporate bodies, meetings, titles ...)
-
Haney, Michael FUmeå universitet,Anestesiologi och intensivvård(Swepub:umu)milhay96
(author)
-
Jensen, Steen MUmeå universitet,Institutionen för folkhälsa och klinisk medicin
(author)
-
Johansson, GöranUmeå universitet,Anestesiologi och intensivvård(Swepub:umu)gojo0001
(author)
-
Näslund, UlfUmeå universitet,Institutionen för folkhälsa och klinisk medicin(Swepub:umu)ulna0002
(author)
-
Umeå universitetAnestesiologi och intensivvård
(creator_code:org_t)
Related titles
-
In:Clinical Physiology and Functional Imaging25:4, s. 246-5221475-09611475-097X
Internet link
Find in a library
To the university's database