A case of second degree, type II, atrioventricular block precipitated by exercise is presented. It is suggested that exercise and other vagolytic manoeuvres may be used as a means of differentiating type I from type II atrioventricular block: the conduction disturbance of type I improves with exercise, whereas that of type II deteriorates with exercise.

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http://www.ncbi.nlm.nih.gov/pmc/articles/PMC482908PMC
http://dx.doi.org/10.1136/hrt.37.9.984DOI Listing

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