Auriculo-ventricular heart-block as a result of asphyxia / by Thomas Lewis and G.C. Mathison.

  • Thomas Lewis
Date:
[1910?]
Catalogue details

Licence: Public Domain Mark

Credit: Auriculo-ventricular heart-block as a result of asphyxia / by Thomas Lewis and G.C. Mathison. Source: Wellcome Collection.

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    of the string, it is not difficult to appreciate certain changes in the mechanism of the heart-beat, and often with the onset of such a change we obtained an early or late tracing. The first table which is given is a fairly characteristic example of such an observation. It differs from the remaining experiments in the fact that the onset of heart-block is, as a rule, earlier than is here shown. TaBLET. Catl. Obs. 4. Decapitated Cat. Artificial Ventilation. 1/100 gr. atropine sulphate. Duration of Auricular | P-R. Ventricular eG in sac pn: Rate. | Interval. Rate. REMARKS, 0,0 124 08 124 0,30 125 ‘O8—-09 125 1,0 127 -07—-08 127 2,0 127 ‘08 127 rite I 127 ‘08 127 2,30 161 U08—-10 161 3,15 180 ‘08 180 3,30 182 ‘08 182 Sl]. variation of auricular rate. 4,0 161 08 161 4,15 142 12—-13 142 Prolongation of P-R interval. 5,0 122 -12—-13 122 Sl. variation of auricular rate. 5,30 113 -12—-13 113 5,45 107 -12—-13 107 6,0 97 -14—-16 48:5 2:1H.B.. Sl. variation of auricular rate. 6,30 96 16 48 7,30 90 — 52 Crib: With restoration of ventilation the heart rate quickened to the original rate, and the heart- block disappeared. TaBLE II, Cat 10. Obs. 4. Intact animal; artificial respiration; urethane and curare; vagi cut. EEE a FF a | Duration of Auricular P-R. Ventricular - Asphy xia, Rate. Interval. : Rate. REMARKS. 0,0 192 10 | 192 1,0 192 10 192 1,15 187 ‘AO + 187 1,30 187 10 187 1,45 205 10 205 T increasing 1,50 205 12 205 T markedly exaggerated 2,30 150 13 150 3,0 130 -14—-15 130 3,9 126 -15—-16 63 ri) Wee! Bf oF 4,15 105 — 67 C.H.B. One extrasystole. 4,40 101 — 59 C.H.B. 5,10 98 18 49 meds 5,45 — — 33 Auricle not recording. The heart subsequently showed complete recovery, the P-R interval measuring ‘O8—-10 sec (cf. Fig. 4c.).
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