. Medical diagnosis for the student and practitioner. Fig. 181.—One of the several formsof pocket sphygmomanometers of theaneroid type. Convenient, compact andportable, but needing standardizationfrom time to time. Fig. 182.—New Nicholson Princosphygmomanometer. Small, portableand accurate. (Courtesy of PrecisionThermometer and Instrument Co., Phila.) The portable instruments now available are, for the most part, sufficientlyaccurate for ordinary clinical work, but systolic blood pressure readingswhich depend upon the usual and least accurate method of determination,, the first palpable re
. Medical diagnosis for the student and practitioner. Fig. 181.—One of the several formsof pocket sphygmomanometers of theaneroid type. Convenient, compact andportable, but needing standardizationfrom time to time. Fig. 182.—New Nicholson Princosphygmomanometer. Small, portableand accurate. (Courtesy of PrecisionThermometer and Instrument Co., Phila.) The portable instruments now available are, for the most part, sufficientlyaccurate for ordinary clinical work, but systolic blood pressure readingswhich depend upon the usual and least accurate method of determination,, the first palpable return of a radial pulsation after obliterative compres-sion, involve an underestimate of from 5 to 15 mm. of mercury. The Older Technic of Blood-pressure Determinations.—The hollowarmlet, applied midway between shoulder and elbow, is inflated by the handbulb until the radial pulse is lost, then by the outlet thumb-screw the pres-sure is lowered until the pulse return is just perceptible. As the pressure isequal in all parts of the closed system
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Keywords: ., bookcentury1900, bookdecade1920, booksubjectdiagnos, bookyear1922
