摘要: His-bundle (H) electrograms were recorded in 49 adults with chronic heart block. Heart failure was noted five (29%) patients having block proximal to H, seven (87%) "split" H potentials, and ten (42%) distal H. Syncope occurred two (25%) 15 (63%) whom syncope significantly more frequent (P Although symptoms related bradycardia all groups, common Neither ventricular rate or QRS duration could be used as an absolute guide the site of
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