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Demonstrates that carotid sinus massage causes transient complete atrioventricular block proximal to the His bundle, indicating vagal inhibition of supra-His conduction.
interval was prolonged to 700 msec. Thereafter a transient period of' complete' atrioventricular block occurred from the end of Fig. During this period the PP intervals were still longer than control. His bundle recordings showed that the atrial (A) impulses (and of course the P waves) were not followed by H deflections. Hence, the block occurred between the atria and the site, within the His bundle, from which the H deflection was recorded.
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Castellanos et al. (1974) studied this question.
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