. 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 . odless by Gartner, G. Wien. med. Wochenschr., 1899, vol. xlix, p. 1412. MEASURING SYSTOLIC PRESSURE 83 squeezing the compressor over it. This is held in place untilthe pressure in the ring is raised above the expected systolicblood-pressure by means of the bulb. Thecompressor is then removed from the fin-ger-tip and the vice which holds the bulballowed t
. 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 . odless by Gartner, G. Wien. med. Wochenschr., 1899, vol. xlix, p. 1412. MEASURING SYSTOLIC PRESSURE 83 squeezing the compressor over it. This is held in place untilthe pressure in the ring is raised above the expected systolicblood-pressure by means of the bulb. Thecompressor is then removed from the fin-ger-tip and the vice which holds the bulballowed to open slowly. As it does, the airgradually returns from the ring into thebulb and the pressure in the whole systemfalls. The finger-tip is watched intentlyand, at a certain point, it is seen to flushsuddenly; then the height of the manometercolumn is taken. At about the same timethe patient is conscious of a throb. In somecases, if the pressure be reduced very gen-tly, the throb will be a few mm. Hg. lowerthan the first flush and will be accompa-nied by a deepen-ing of it. Themanometer read-ing at the instantthe color returnsrepresents, withthe reservationsmade heretofore(see page 66), thesystolic end-pres-sure in the Fio. 23.—Gaetner3 tonometer. Advantages.—In most cases the easy perception of thereturn of color to the finger gives this method a strong recom-mendation. It requires no special skill in its apphcation. 84 THE MODERN SPHYGMOMANOMETERS Defects.—Unfortunately these are numerous enough tooutweigh the advantages, and the majority of careful observ-ers, in this country as abroad, have adopted methods which canbe applied to the arm. These defects are due in part to badlyfitting rings (see page 56), unless one have a large assortmentof sizes, or to careless apphcation (see page 60); in part toinsufficient width of the compressing surface (see page 59).Most important of all, and least remediable, are the errors in-herent in aU methods which measur
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Keywords: ., bookcentury1900, bookdecade1900, booksubjectbloodpr, bookyear1904
