. 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 . del. 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 pres
. 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 . del. 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 pressure,^ and has a wide vogue in France; while. Fia. 9.—Potains sphygmomanometeb. the V. Basch instrument is still stoutlydefended against all new-comers by itsinventor and his pupils of the Viennaschool. To them belongs the great honor of the pioneer workin the field of clinical sphygmomanometry, and to their effortswe owe the recognition of its value; but the lack of earlieracceptance by physicians in general was due to distrust of theabsolute value of the results obtained with the instrument,and to the skill required for its use. v. Basch will always beremembered as the inventor of clinical sphygmomanometry,but his method must give place to its simpler and more accu-rate offspring. Potain. La pression arterielle de Thomme a Ietat normal et patholo-gique, Paris, Masson, 1903. DEVELOPMENT
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