. Principles of electro-medicine, electrosurgery and radiology : a practical treatise for students and practitioners. With chapters on mechanical vibration and blood pressure technique . n in males. Inchildren from 73 mm. Hg. at one year to 105 mm. Hg. at twelve years. The normal diastolic pressure equals approximately two-thirds ofthe systolic pressure, and ranges from 60 to 105 mm. Hg. The Normal Pulse Pressure equals approximately one-third of thesystolic pressure, and ranges from 25 to 50 mm. Hg. The normal blood pressure being modified by a number of normalor physiological conditions (pos
. Principles of electro-medicine, electrosurgery and radiology : a practical treatise for students and practitioners. With chapters on mechanical vibration and blood pressure technique . n in males. Inchildren from 73 mm. Hg. at one year to 105 mm. Hg. at twelve years. The normal diastolic pressure equals approximately two-thirds ofthe systolic pressure, and ranges from 60 to 105 mm. Hg. The Normal Pulse Pressure equals approximately one-third of thesystolic pressure, and ranges from 25 to 50 mm. Hg. The normal blood pressure being modified by a number of normalor physiological conditions (position, excitement, digestion, exercise,time of the day, etc.) is therefore subjected to some variations. 138 Anthony Matijaca Abnormal Blood Pressure Any sustained systolic pressure below 100 mm., or above 150 mm.,should be considered pathological. It should, however, be rememberedthat as one grows older the systolic pressure increases, because the har-dening of the arteries increases (and consequently the diastolic pressuremaintained by the elastic recoil decreases); therefore, that a person ofover 60 may be comparatively healthy with a systolic pressure slightlyover 150 mm. Fig. 82—The Auscultation Method with theMercurial Sphygmomanometer. A sustained diastolic pressure of 110 mm. or over, and a pulse pressurebelow 25 mm. or above 50 mm., indicates a diseased condition, or atleast approaching disease. It should be remembered that: (a) A low systolic pressure (110 mm. Hg. or under), especially ifaccompanied by a low pulse pressure (below 25 mm. Hg.) suggests tu-berculosis; (b) In nephritis and arteriosclerosis, the diastolic, as well as systolic,pressure is ordinarily increased; Electro-Medicine, Electro-Surgery and Radiology 139 (c) In fevers, usually the diastolic pressure is low, whil^ the systolicpressure is more frequently high; (d) In disturbance of compensation, systolic and diastolic pressureare both low; (e) The high pulse pressure may be due to a fall of the
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