The Year Book of Medicine Volume 1

The Year Book of Medicine Volume 1

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This historic book may have numerous typos and missing text. Purchasers can usually download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1908 edition. Excerpt: ...and the beats are irregular in rhythm and vary in the degree of systole and diastole. Stimulation of the vagus has no efiect whatever on the movements of the auricle, while the ventricle is rendered slower and more regular or may be arrested completely. The more regular contraction of the ventricle under vagus stimulation is obviously due to the fact that the impulses from the auricle pass less rapidly through the block; when they are altogether excluded by section of the auriculoventricular band the ventricle beats regularly. The auricular delirium occurring in dogs during the operation was obviously the result of sensory stimuli carried from the chest wall to the central nervous system, and it is probable that this gives rise to reflex inhibition of the vagus center, which, acting on an abnormal heart, causes auricular fibrillation. The suggestion is made that in the pa tient described and in other cases of paroxysmal arrhyth-' mia the condition is due to auricular fibrillation from inhibition of the vagus center. G. Joachim1 reports two cases of irregularity of the pulse in which the intermissions in the ventricular systole were accompanied by more frequent pulsations of the auricle, indicating a disturbance of the conductivity. In two other cases, however, while the ventricular pulsations indicated a similar failure of conductivity, the jugular tracings showed that the auricles beat with the same rhythm as the ventricle, so that no failure of conductivity could be demonstrated unless it occurred between the mouth of (1) Deutsches Archiv f. klin. Med., lxxxvili, No. 5. the veins and the auricle. Other suppositions are discussed, such as a failure. of irritability, but the author admits that he can give no satisfactory explanation more

Product details

  • Paperback | 136 pages
  • 189 x 246 x 7mm | 254g
  • United States
  • English
  • black & white illustrations
  • 1236923731
  • 9781236923738