Auricular fibrillation and its relationship to clinical irregularity of the heart / by Thomas Lewis.

  • Thomas Lewis
Date:
[1910?]
Catalogue details

Licence: In copyright

Credit: Auricular fibrillation and its relationship to clinical irregularity of the heart / by Thomas Lewis. Source: Wellcome Collection.

    38/80 page 340
    MO Fig. 6 (1-6). X % linear. The time marking is in seconds. Hiirthie manometer curves from the carotid of a dog in which the anricle was fibrillating. Chest wall intact. A small jiortion of normal curve is shown in line 3. At the ]>oint where the arrow is ])laced the auricle, \\hich had resumed its normal rhythm, was faradised. The venous curves and their comparison. The venous curves associated vith complete irregularity of the heart have been discussed at length in the preceding pages. The venous curves in experimental auricular fibrillation were obtained by exactly similar means*. The ink polygraph was employed, and large and well-fed dogs were chosen for the jnirpose. The femoral curves were secured by ex})osing the artery in the thigh and by stitching the receiving apparatus in place over it. The jugular tracings were obtained by fastening the receiver to the shaven neck ; the ap]dication of vaseline ensured complete closure of the transmitting system. Curves have been taken with the chest open and closed. They present no essential difference ; those which illustrate this section are examples from animals in which the chest wall had been restored. In Fig. 7 a and h strips of curve from a single animal are represented. In the upper curve the normal rhythm is interrupted by a short induced paroxysm of irregularity due to fibrillation of the auricle. The venous tracing while the rhythm is regular, before and after the paroxysm, consists of clearly inscribed a, c and v waves. During the paroxysmal period each of the irregular beats (several fail to im])ress the femoral curve) is accom- panied by tvo prominent waves in the veins; the waves are separated from each other, and the second wave is succeeded, by a well-marked depression. ♦ Horing--* statoB in a recent note, that lie has soon vonov.s curves, and that they are of ventricular form.
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