The murmurs of mitral disease / by Edward Mansfield Brockbank.

  • Edward Mansfield Brockbank
Date:
1899
Catalogue details

Licence: Public Domain Mark

Credit: The murmurs of mitral disease / by Edward Mansfield Brockbank. Source: Wellcome Collection.

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    l.v. ventricle. This latter syringe consists of an old type of Glover's lithotripsy evacnator, part of which is formed by a glass chamber. Into the free end or head of the glass chamber the auriculo-ventri- cular tube screws, so that about 1 in. projects into the chamber and an equal amount remains outside. To the outer end of the tube the auricle syringe is fixed, and on to the inner end imitation stenosed valves are placed, where their be- haviour, under different conditions of water pressure, can be clearly watched. The imitation stenosed valves are best made by shaping out of a piece of grey rubber sheet, ^T in. thick, a slightly con- ical tube about £ in. long, and with a diameter at the apex equal to about that of a black-lead pencil. The rubber is cemented into the proper shape by means of the solution of rubber in puncture-mend- ing outfits for bicycle tyres. Eather stiffer, and not quite so satisfactory, but still very fair imitation valves, may be made with + to £ in. of rubber drainage tubing, about \ in. in diameter of lumen. Either of these valves is simply slipped on to the inner end of the metal tube, so that about \ in. of it projects beyond the end of the tube. The metal tube is then screwed home, and the valve is seen in position through the glass chamber, and it will be noticed at once that it tends to prevent the flow of water out of the ventricle syringe, but allows a free flow in the opposite direction. In this apparatus, then, the syringe (a) corresponds with the auricle, (v) with the ventricle, and the imitation valve with the stenosed mitral valve. There is no outlet from the ventricle syringe to compare with the aorta, but I have purposely avoided such, as without it a high pressure can be more readily generated, and the results obtained are the same as if an aorta were present. I will not go into any more detail concerning this apparatus, but will mention the results obtained with it. As before, the experiments were carried out under water to keep all air out of Fig. 3.—Diagram of apparatus for in- vestigating the rhythm of cres- cendo murmurs.
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