. The clinical study of blood-pressure : a guide to the use of the sphygmomanometer in medical, surgical, and obstetrical practice, with a summary of the experimental and clinical facts relating to the blood-pressure in health and in disease . The pressure will fall slightly, owing to adjustmentof the cuff, etc. The lever will show small oscillations. Bringthe lever to bear on the drum, by turning the pinion-screw,and set the drum in motion. Now turn the stop-cock to 1 or 3,preferably the latter, after one has become expert. The leverwiU at first be depressed, then rise slowly, and the tracing
. The clinical study of blood-pressure : a guide to the use of the sphygmomanometer in medical, surgical, and obstetrical practice, with a summary of the experimental and clinical facts relating to the blood-pressure in health and in disease . The pressure will fall slightly, owing to adjustmentof the cuff, etc. The lever will show small oscillations. Bringthe lever to bear on the drum, by turning the pinion-screw,and set the drum in motion. Now turn the stop-cock to 1 or 3,preferably the latter, after one has become expert. The leverwiU at first be depressed, then rise slowly, and the tracing wiU SYSTOLIC AND DIASTOLIC MEASUREMENTS 99 gradually increase- in amplitude. The tracing and the ma-nometer must both be closely watched, and the moment thepressure falls below the systolic pressure in the artery, thetracing will show an abrupt increase in size, usually with adepression of the lever (see Fig. 30). The manometer mustbe read off at this point, which gives the systolic abrupt change is clearer with the more rapid fall of pres-sure through capillary 3, but it requires more practice to readthe manometer at the exact moment. To determine the dia-stolic pressure, allow the air to continue escaping slowly until. Fig. 32.—Tkaoino from a high tensios pulse by Erlanqebs Sphygmomanometek. At 210 mm. the return of the pulse indicated systolic pressure, though the trace does not show the abrupt increase 135 mm. is the lowest limit of maximal pulsation; diastolic pressure (marked Min.). the pulsations show a distinct decrease in amplitude. The lastpoint at which they are of maximum height is the diastolicpressure (see page 69). During the fall in pressure, a decrease in amplitude oftenoccurs shortly after the systolic pressure has been reached,with subsequent increase. Fig. 33 shows these two lower is unquestionably at the diastolic pressure. Erlan-ger considers the first decrease due to the rapid re-entrance ofblood to the arm, the late
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Keywords: ., bookcentury1900, bookdecade1900, booksubjectbloodpr, bookyear1904
