. 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 . ure; the subsequent fall in pressure, with decreased pulse-pressure, while the rateremained rapid. nerves in general, and of the cerebral cortex (see page 21). One istempted to think of the dependence of the brain circulation upon generalblood-pressure to meet its local demands, since -the brain vessels probablyhave little vaso-motor supply, as the possi
. 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 . ure; the subsequent fall in pressure, with decreased pulse-pressure, while the rateremained rapid. nerves in general, and of the cerebral cortex (see page 21). One istempted to think of the dependence of the brain circulation upon generalblood-pressure to meet its local demands, since -the brain vessels probablyhave little vaso-motor supply, as the possible cause of the increased aorticpressure which accompanies cerebral activity. VARIATIONS IN THE SAME INDIVIDUAL 131 The meaning of these psychical influences for the clinicianis obvious. In all determinations of blood-pressure they shouldbe conspicuous by their absence, and the physician must sedu-lously guard his patient against undue interest in the pro-cedure itself, or fear of, it, and secure as complete mentalrelaxation as possible during Jhe measurement. H. Influence of Muscular Exertion.—That muscular workusually increases systolic blood-presliire~lU luaffjiasjbeen kuuwu tiiadH the early mvestigations with the v. Basch sphyg-. FlG. 39.—EiaE IN BLOOfi-PBESSUKE PEODUOED BY MUSCULAR EXERTION. (Eiva-Kooois sphygm., 5 cm.) Chart obtained from a student of twenty-two, who performed, with both legs, 88kilogrammeters of worli a minute. At the close of the work, slight fatigue of the legs,and somewhat deepened respiration. The hatched area, below indicates the duration of the work. Note the rapid rise in blood-pressure and pulse-rate, maintained throughout; and theequally rapid return to normal. (From Masing, Deutsch. Arch. f. klin. Med., 1902,vol. Ixxiv, p. 283.) ntonianomglai:—^ This, of course, tallies with the results ofrangi and Zunst in dogs (see page 39). Zadek, and Maxim-owitch and Rieder found the rise in pressure proportional tothe work done, reaching as much as
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