American journal of physiology . cipheredfrom calibrated optical records (, at h, Fig. i), are progress-ively lower than auricular pressures measured by the watermanometer.^ The results, belonging to the curves shown inFig. 4 and indicated in the following table in millimetres ofwater, are characteristic. Intra-auricular pressure 24 32 54 90 130 150 190 Initial Intraventricular pressure ^ For technic of measurement, cJ. Wiggers: This journal, 1914, xxxiii, p. 15. 390 Carl J. Wiggers Further experiments will be necessary to determine whetherthis may be a
American journal of physiology . cipheredfrom calibrated optical records (, at h, Fig. i), are progress-ively lower than auricular pressures measured by the watermanometer.^ The results, belonging to the curves shown inFig. 4 and indicated in the following table in millimetres ofwater, are characteristic. Intra-auricular pressure 24 32 54 90 130 150 190 Initial Intraventricular pressure ^ For technic of measurement, cJ. Wiggers: This journal, 1914, xxxiii, p. 15. 390 Carl J. Wiggers Further experiments will be necessary to determine whetherthis may be attributed to the inferiority of a saline manometerin measuring these changes. For the present it is sufficient todirect attention to the fact that the figures of intra-auricularpressure given by the convenient saline manometer may notalways be regarded as synonymous with the initial intraventric-ular tension. The effect of changing the initial intraventricular tension ^is exemplified by the transcribed curves shown in Fig. 4. As. Figure 4. Effect of initial auricular pressure on initialtension and pressure curve. Numbers refer to auric-ular pressure. the auricular and, consequently, the initial intraventricular pres-sure increased, the entire curve mounted higher. The steepnessof the ascending limb increased, showing that it follows the lawof the isometric curve established by Frank for - the frogs ven-tricle. The height of the isometric portion of the curve (,the point d, Fig. 3), as in the case of the afterloaded frogs ventri-cle, is determined not only by its incline, but by its terminationthrough opening of the semilunar valves. ^ Lower pressures were produced by clamping the inferior vena cava orhemorrhage; higher pressures, as a rule, by saline Frank: loc. cit. The Pressure Curve in the Right Ventricle 391 The curves undergo a marked change in contour during theejection period. With low initial pressures the top is quicklyreached and the descending limb of
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