File:A text-book of physiology - for medical students and physicians (1916) (14769979182).jpg

Identifier: textbookofphysio1916howe (find matches)
Title: A text-book of physiology : for medical students and physicians
Year: 1916 (1910s)
Authors: Howell, William H. (William Henry), 1860-1945
Subjects: Physiology Medicine
Publisher: Philadelphia and London : W. B. Saunders Company
Contributing Library: Yale University, Cushing/Whitney Medical Library
Digitizing Sponsor: Open Knowledge Commons and Yale University, Cushing/Whitney Medical Library

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in, as represented in the diagram. It is covered by a glass plate held firmlyin position and the bag is then blown up until the vein disappears; the pressureat which this happens is shown by the manometer and marks the pressure * Muench. mediz. Wochenschrift, 1903, 1904. t Von Recklinghausen, Archiv f. exper. Pathol, u. Pharmakol., 55, 470,1906. 508 CIRCULATION OP BLOOD AND LYMPH. within the vein. A convenient modification of this apparatus, which hasbeen described by Hooker,* is shown in Fig. 207. A small glass chamber isfastened on the hand over a vein by means of a film of collodion solution.The interior of the chamber is connected by rubber tubing with a watermanometer and a pressure bulb. By means of the latter the air pressure onthe vein may be raised until the vein is just obliterated and the pressure usedis indicated on the manometer in centimeters of water. With instruments of this kind the degree of pressure neces-sary to obliterate a given vein in the arm, hand, or foot can
Text Appearing After Image:
Fig. 207.—Hookers venous pressure apparatus. A glass capsule, A, is fastened to the skinover a vein by means of a solution of collodion. This capsule is connected by rubber tubingwith a pressure-bulb, C, and a water manometer, M. By means of the bulb the pressure israised in A until the vein is obliterated. The pressure at which this occurs is shown by thelevel of the liquid in the manometer. This pressure, expressed in centimeters of water, is cor-rected by subtracting the distance between the vein and the costal angle, as indicated on themetal rod supporting the hand. B gives an enlarged view of the glass capsule. be determined readily in terms of a column of water, but itis obvious that for any given vein this pressure will vary withthe position of the vein. When the hand hangs pendent atthe side the pressure within its veins will be greater than whenthe hand is raised to the heart-level. The pressure actualtymeasured for any given position of the hand or foot must, * Hooker, Ame

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