. Electricity : its medical and surgical applications, including radiotherapy and phototherapy . ral and kept wet with equal parts of sulphuric acid and water (toneutralize the alkaline liquids which form at the negati\e pole). Thespiral end rests on the centre of the growth and the insulated shank isheld on the healthy skin with adhesive plaster. It may be Avell at timesto follow this treatment with a mild monopolar application. In cavities,as the rectum, a spade-shaped electrode (Fig. 334, H) covered with cottonmoistened with the acid and water may be used as the negative poleand held agains
. Electricity : its medical and surgical applications, including radiotherapy and phototherapy . ral and kept wet with equal parts of sulphuric acid and water (toneutralize the alkaline liquids which form at the negati\e pole). Thespiral end rests on the centre of the growth and the insulated shank isheld on the healthy skin with adhesive plaster. It may be Avell at timesto follow this treatment with a mild monopolar application. In cavities,as the rectum, a spade-shaped electrode (Fig. 334, H) covered with cottonmoistened with the acid and water may be used as the negative poleand held against the growth. Little pain is felt after the operation. The dressing may have to bechanged more or less frequently after the first few days, according tothe amount of serous discharge. If odor appears, a moist bichloridedressing may be used. The slough separates from the seventh to thetwenty-first day, according to the nature and size of the growth. Afterthe separation there may be some risk of secondary hemorrhage inlocalities near large bloodvessels. In some instances these msiy be Fig. 337. Negative electrode for bipolar cataphoric operation in external situations. (Massey.) ligated a few weeks previous to the cataphoric operation. A secondoperation should be done if complete destruction has not the minor operation, general anesthesia is not required, cocaine orSchleichs fluid being used, depending whether the place being treatedis denuded of skin, or injection underneath the skin is required. Anordinary good graphite controller and milliamperemeter (Figs. 46 and105) will answer, as extremely heavy currents are not used, from 2 to80 milliamperes being sufficient. Smaller zinc electrodes are used, andif a sinus lead to the part to be treated, unless it is desired to affectits walls also, an insulated electrode (Fig. 334, B) should be used. Inmalignant conditions, the applications should last about thirty minutes;in tubercular, fifteen will be sufficient. Otherwise
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