Why the study?
Does electronic pacing with long atrial-ventricular intervals cause presystolic mitral reflux in dogs with acute heart block?
Does electronic pacing with long atrial-ventricular intervals cause presystolic mitral reflux in dogs with acute heart block?
Abnormally long PR intervals lead to presystolic mitral reflux due to ineffective atriogenic mitral valve closure in a canine model.
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Long AV intervals during pacing may promote presystolic mitral reflux; leaves open relevance to human heart block.
Williams et al. (1968) studied this question.
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