File:Kirkes' handbook of physiology (1907) (14767431104).jpg

Identifier: kirkeshandbookof00kirk (find matches)
Title: Kirkes' handbook of physiology
Year: 1907 (1900s)
Authors: Kirkes, William Senhouse, 1823-1864 Greene, Charles Wilson, 1866-1947
Subjects: Physiology
Publisher: New York, W. Wood and company
Contributing Library: Columbia University Libraries
Digitizing Sponsor: Open Knowledge Commons

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wall over the place of the greatestimpulse of the heart. The box or tambour communicates by means of anair-tight tube with the interior of a second or recording tambour suppliedwith a long and light writing lever. The shock of the hearts impulse beingcommunicated to the ivory knob, and through it to the first tambour, theeffect is, of course, at once transmitted by the column of air in the elastic11 162 THE CIRCULATION OF THE BLOOD tube to the interior of the second recording tambour, also closed, and throughthe elastic and movable disc of the latter to the writing lever which is ad-justed to a registering apparatus. This latter generally consists of a cylinderor drum covered with smoked paper and revolving by clock-work with adefinite velocity. The point of the lever writing upon the paper producesa tracing of the hearts impulse or cardiogram. Endocardiac Pressure. The effect of the muscular contractionsand relaxations of the walls of the heart durinEr its svstole and diastole is to
Text Appearing After Image:
Fig. 158.—Double Cardiac Sound for Simultaneous Registration of the Blood Pressure in theRight Auricle and Ventricle, or in the Aorta and Left Ventricle. (Hiirthle.) produce varying changes of pressure on its content of blood. When thispressure is measured by the proper instrument it is found that the pressurein the left ventricle varies between wide ranges. With the beginning ofthe muscular contraction, the pressure rises till it slightly exceeds that ofthe pressure of the aorta, remains high for a brief interval of time, then slowlyand quietly decreases to less than that of atmospheric pressure and remainslow until the beginning of the next systole. For the right ventricle the eventsand variations are relatively the same. ENDOCARDIAC PRESSURE 163 In order to determine the endocardiac pressure communication mustbe established with the cavities of the heart. This is accomplished by atube known as a sound, which is introduced into the left ventricle by passing

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