The Practitioner Volume 9

The Practitioner Volume 9

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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. 1872 edition. Excerpt: will be heard both in respiration and expiration; and its harshness, loudness, and pitch will depend upon the force given to the' respiration. It may be heard in perfection in the chest of a child, before the true respiratory murmur has been developed. If the chest of a person in health be examined, and the existence of the true respiratory murmur in its fulness and perfection' be established, it will be found, if he be again examined after suffering from a chill, with pain in the back, head, and limbs, &c., that a change has taken place; the true respiratory murmur may still be heard, but it will be obscured or muflled. All the capillaries of the lung are gorged with blood, and this is the explanation of the muflled murmur. If the disease progress, in a few hours the true respiratory murmur is no longer audible, but in place of it is a fine crepitant rale. The congestion of the capillaries of the lungs still remains; there is scarcely a perceptible difference in the percussion note; the residual air still occupies its seat in the true respiratory system, and it still continues to dilate the air-sacs, alveoli, and terminal tubes. Whatever change has taken place must have been at the seat of the true respiratory murmur. The change consists in thickening of the connective tissue of the lungs with plastic material. Thus thickened and. stiffened, it is unable to contract, and the true respiratory murmur is gone; but it must yield, though unwillingly, to the dilating force of the residual air, increased one-tenth at each inspiration, separating newly formed plastic exudations, causing sound which we hear as a pin crackling, and call it crepitant rale. In a few hours more the crepitant rale as well as true respiratory murmur more

Product details

  • Paperback | 142 pages
  • 189 x 246 x 8mm | 268g
  • United States
  • English
  • black & white illustrations
  • 1236791355
  • 9781236791351