On the origin of anaemic murmurs / by James Kingston Fowler.

  • Fowler, James Kingston, Sir, 1852-1934.
Date:
1884
Catalogue details

Licence: Public Domain Mark

Credit: On the origin of anaemic murmurs / by James Kingston Fowler. Source: Wellcome Collection.

    18/54 (page 14)
    proved by tlie experiments of Corrigan, Neumann, and others. Corrigan* in his well-known experiments demon- strated that when a stream of water is flowing through a piece of intestine, no sound, or a murmur exceedingly indistinct, is audible whilst the intestine is tense, but if any part be constricted so as to pro- duce an alteration in the motion of the fluid, a very loud bruit is at once produced. This bruit is audible only on the distal side of the constriction. F. Neumann in experiments on the motion of fluids in closed vessels has shown that the extreme peri- pheral layer merely moistens the walls and cannot therefore give rise to sound by its friction against the surface. It has also been shown by Weber, that if a stream of water be only sufiiciently rapid, murmurs may even be produced in a glass tube of uniform diameter. That the rapidity of the stream is an important factor in the production of murmurs is quite in accord with clinical experience, as we often find a sound which, when the heart is acting quietly, is only murmurish or prolonged, become a distinct bruit when the pulse-rate is accelerated by exertion or excitement ; and conversely; it explains the absence of murmur in some cases of mitral stenosis when the left auricle is feeble, and its disappear- ance in the later stages of valvular disease when the power of the heart is failing. * ' On the Mechanism of Bruit de Sonfflet,' Dub. Journal of Med. Sc., 1836 and 1839.