. 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 . l membrane connecting the ends of BB. D = opening from outer tube leading to recording apparatus and manometer. E = opening connected with pressure flask. (From Howell and Brush.) coupled with Mossos simpler demonstration, are convincingas to the essential accuracy of the point of maximum amph-tude of pulsation as a guide to diastoUc arterial
. 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 . l membrane connecting the ends of BB. D = opening from outer tube leading to recording apparatus and manometer. E = opening connected with pressure flask. (From Howell and Brush.) coupled with Mossos simpler demonstration, are convincingas to the essential accuracy of the point of maximum amph-tude of pulsation as a guide to diastoUc arterial practical aspects of it alone remain to be touched onhere. 72 INDIRECT MEASUREMENT OF BLOOD-PRESSURE When used clinically, it is not possible to obtain thoroughlyaccurate judgments of where the pulsation is greatest, by simplywatching the fluctuations of the mercury column. With amanometer of at least 3 mm. calibre, and rigid connectingtubing, quite large oscillations may be obtained, and a reason-able approximation of diastolic pressure made with a simpleclinical instrument. With rapid pulses, neither the eye- northe mercury follow the movements quickly enough, and someform of tambour becomes necessary for magnifying and record-. Fia. 20.—Tbaoing prom a normal pulse Bif Erlanoers sphtgmomanometeb. At 115 mm. is seen the abrupt increase in amplitude which indicates systolic (max.)pressure. At 90 ram. the pulsation is still maximal, but at 85 mm. it is muchdiminished. 90 mm. is therefore the diastolic (min.) pressure. ing them. For this reason the types of apparatus which givediastolic pressure satisfactorily in all cases are more bulky,require longer for a reading, and are more costly, than the sim-pler ones measuring systolic pressure. Hill and Barnards isan exception as regards the first two drawbacks; but its deli-cate metal tambour is easily disordered, and does not give exactreadings unless frequently corrected by comparison with a mer-cury manometer. Besides, it i
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Keywords: ., bookcentury1900, bookdecade1900, booksubjectbloodpr, bookyear1904
