. 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 . o 10090 so 70 50do302010 Fig. 67.—Foboible stbktohino of left sciatic nerve foe sciatica.(Cooks sphygin. 5 cm.) Primary ether rise in , with slight acceleration of the Marked rise In Wood-pressure, with greater acceleration of the pulse-rate, during themanipulation of the nerve (transient pressor effect of peripheral nerve stimu
. 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 . o 10090 so 70 50do302010 Fig. 67.—Foboible stbktohino of left sciatic nerve foe sciatica.(Cooks sphygin. 5 cm.) Primary ether rise in , with slight acceleration of the Marked rise In Wood-pressure, with greater acceleration of the pulse-rate, during themanipulation of the nerve (transient pressor effect of peripheral nerve stimulation).(From Cook and Briggs, Chart No. II.) A much greater reflex rise in arterial pressure follows theirritation of nerve-trunks. This is typically shown in Fig. 67, BLOOD-PRESSURE DURING OPERATIONS 367 from stretching of the sciatic nerve. It is a clinical duphcateof the tracing in Fig. 6, obtained on stimitlation of the anteriorcrural nerve in a dog. A similarly marked vaso-constrictionfollows the simple operation of dilating the sphincter suggests that the sudden deaths, which have occa-sionally been reported during these sUght operations, may bedue to rupture of a diseased cerebral vessel by the Fia. 68,—^OPEBATioN FOK oaTEOMTELiTis 01 TEMUB. (Authors sphygm, 12 cm.) Note the primary rise in blood-pressure and pulse-rate frj)m nitrous oxide; the absenceof any further rise from ether; the fall, as full anaesthesia -was reached; the incision rise(15 mm.); the slight subsequent effect of the operative proeedures. Operation by Dr. Howard Collins. Observation by Dr, Chapin. Severe manipulation of large mixed or sensory nerves, asin forced retraction, the separation of firmly fixed tumors,and other procedures requiring considerable traction, maycause a sharp fall in blood-pressure. In Oriles experience thiswas especially pronounced when the superior laryngeal nerve ^268 BLOOD-PRESSURE IN SURGICAL CONDITIONS was injured. A reflex slowing of
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Keywords: ., bookcentury1900, bookdecade1900, booksubjectbloodpr, bookyear1904
