. 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 . Fio. 7.—V. Baschs model. DEVELOPMENT OF SPHYGMOMANOMETERS 47 has come to equilibrium and the zero point of the manometer hasbeen determined. The mode of apphcation is as follows: Anartery, temporal or radial, is selected, which Kes closely uponbone, and pressure is made over it with the pelotte, care beingtaken that the compression
. 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 . Fio. 7.—V. Baschs model. DEVELOPMENT OF SPHYGMOMANOMETERS 47 has come to equilibrium and the zero point of the manometer hasbeen determined. The mode of apphcation is as follows: Anartery, temporal or radial, is selected, which Kes closely uponbone, and pressure is made over it with the pelotte, care beingtaken that the compression shall be directly against the the pressure is increased, water is forced out of the pelotteinto the closed arm of the manometer, which at each momentregisters the exact pressure exerted over the artery. Thepulse is felt with a finger of the opposite hand, just beyond. Fia. 8.—V. Basohs model. the point of compression, or made visible by a lever held overthe artery by a rubber bracelet. Just at the moment when itdisappears, or, as most prefer, when it first returns as thepressure is lowered, the manometer is read off. This readinggives the pressure in millimeters of mercury necessary toobliterate the artery; that is, the systolic end pressure, pluscertain other factors, which will be considered shortly. The original instrument of v. Basch has undergone numer-ous modifications at his own hands and others. The mostimportant were his introduction of a portable metal manom- 48 INDIRECT MEASUREMENT OF BLOOD-PRESSURE eter, and the change in the pelotte, as shown in Fig. 8; and,in 1889, Potains replacement of the water by air, the pressureof which is raised by a bulb connected with the circuit throughan extra branch tube. Potains sphygmomanometer, as shownin Fig. 0, was the basis of his extended clinical researchesinto arterial pr
Size: 1643px × 1520px
Photo credit: © Reading Room 2020 / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookdecade1900, booksubjectbloodpr, bookyear1904
