File:A text-book of physiology, for medical students and physicians (1907) (14591466140).jpg

Identifier: textbookofphysio1907howe (find matches)
Title: A text-book of physiology, for medical students and physicians
Year: 1907 (1900s)
Authors: Howell, William H. (William Henry), 1860-1945
Subjects: Physiology Physiology
Publisher: Philadelphia, London, W.B. Saunders Co.
Contributing Library: Columbia University Libraries
Digitizing Sponsor: Open Knowledge Commons

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OOD AXD LYMPH. (b) Period of filling. This period begins as soon as the auriculo-ventric-ular valves open and the stream of blood, which had been flowinginto the auricle throughout the ventricular systole, is permitted toenter the ventricle. During this period of filling the ventricularpressure rises slightly as the heart becomes turgid with blood. Thisincrease of pressure is indicated in most cardiograms by a gradualrise of the curve during this period. It is shown in the curve ofChauveau and Mary, given in Fig. 217. The Volume Curve and the Ventricular Output.—In thelower animals the thorax may be opened with suitable pre-cautions as regards anesthesia and artificial respiration, andthe heart may be placed within a plethysmograph (see p. 584)to measure its changes in volume during systole and diastole.If the whole heart is treated in this way the curve of volumechanges is complicated by the fact that one chamber, theauricle, is filling, while the other, the ventricle, is emptying.
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Fijr. 22.,.- Diagram to show the arrangement of the Henderson cardiometer. Therecording tambour is inverted, so that the systole will give an up-stroke on the curve.(After Hirschfelder.) A more useful disposition of the apparatus is to enclose onlythe ventricles. Several different forms of plethysmograph havebeen devised for this purpose, and they are usually spoken of asctirtiiniiK i< I-.-. The form described by Henderson* is simple andeasily applied to the heart. Its structure and the connectionsof the recording apparatus are indicated in the diagram givenin Fi»-. 223. The apparatus consists of a rubber ball with acircular opening at one point. Over this opening is placed amembrane of rubber dam with a central opening through whichthe heart is introduced as showD in the diagram. The rubbermembrane lie- -miidy in the auriculoventricular groove, makingan air-tigh1 joint. The interior of the ball is connected bystiff tubing with a recording tambour. By an arrangementof this kind th

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