Changes in QT interval during exercise testing in patients with VVI pacemakers.
The changes in QT intervals were studied in nine patients with normal sinus node function who had VVI pacemakers. Though PP intervals uniformly shortened during exercise, the change in QaT* intervals during exercise was variable. The correlation between PP and QaT intervals varied from case to case. A good correlation was found in only two cases (r = +0.816 or +0.897); a fair correlation was found in four cases (r = +0.672, +0.615, +0.615, or -0.669) and in the remaining three, the correlation was poor (r = +0.494, +0.467 or -0.424). In patients who are candidates for VTI pacemaker implantation, changes in QaT intervals should be assessed during exercise stress testing to determine if the intervals shorten during exercise or not.
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D000328:Adult; D000368:Aged; D004562:Electrocardiography; D005080:Exercise Test; D005260:Female; D006327:Heart Block / Q000503:physiopathology / Q000628:therapy*; D006329:Heart Conduction System / Q000503:physiopathology; D006801:Humans; D008297:Male; D008875:Middle Aged; D010138:Pacemaker, Artificial