American journal of physiology . -pes of experiments just mentioned the criterion ofvagus action has been the height of auricular contraction. The ques- MkKX,^ .^. III I M I I I ( J I I I I I U I I I I M (| , , I I I I ) ( ) I ) M I M I I I M i I M M Figure 7 tion whether conductivity and excitability decrease also as a result ofthose vagus impulses which pass through the compressed area hasalready been mentioned in the description of Figs. 3 and 4, but canbe much more strikingly shown in the following way. After the firstclamp has been placed between sinus and auricles, as described above,and
American journal of physiology . -pes of experiments just mentioned the criterion ofvagus action has been the height of auricular contraction. The ques- MkKX,^ .^. III I M I I I ( J I I I I I U I I I I M (| , , I I I I ) ( ) I ) M I M I I I M i I M M Figure 7 tion whether conductivity and excitability decrease also as a result ofthose vagus impulses which pass through the compressed area hasalready been mentioned in the description of Figs. 3 and 4, but canbe much more strikingly shown in the following way. After the firstclamp has been placed between sinus and auricles, as described above,and sufficiently tightened to produce quiescence of the auricles andventricle, a second clamp is placed at the ventriculo-auricular amount of compression is graded to a point almost, but not quite,sufficient to produce the first stages of block, then the ventricle isrhythmically stimulated in the method described in the last , while rhythmically stimulating the apex of the ventricle, either,vagus nerve is stimulated with weak faratic shocks. The result isdirect and immediate, partial or complete ventriculo-auricular block isproduced. Th
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