Variable PR intervals: what is the rhythm?
Morady
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Department of Internal Medicine, University of Michigan Medical Center, Ann Arbor 48109-0022, USA.
D000368:Aged; D018450:Disease Progression; D004562:Electrocardiography; D005260:Female; D006327:Heart Block / Q000503:physiopathology*; D006339:Heart Rate / Q000502:physiology*; D006801:Humans