. Regional anesthesia : its technic and clinical application . roots areapproached, provided the solution has diffused to the recurrent branchessupplying the cord membranes; otherwise the dura is still of the dura and the cord may be rendered painless bythe injection of a few drops of the 2 per cent, novocain solution withinthe subarachnoid space, before incising the dura. It is customary- to in-sensitize these structures by applications of thin bands of cotton moist-ened with the 1 per cent, novocain solution, or with per cent, stovainsolution (Harris), kept in cont
. Regional anesthesia : its technic and clinical application . roots areapproached, provided the solution has diffused to the recurrent branchessupplying the cord membranes; otherwise the dura is still of the dura and the cord may be rendered painless bythe injection of a few drops of the 2 per cent, novocain solution withinthe subarachnoid space, before incising the dura. It is customary- to in-sensitize these structures by applications of thin bands of cotton moist-ened with the 1 per cent, novocain solution, or with per cent, stovainsolution (Harris), kept in contact with the dura, then with the cord. ON THE THORAX 339 If the operation extends to the upper dorsal region of the spine, atransverse line of subcutaneous infiltration is made at the base of theneck, or between the shoulders, to control the overlapping superficialcer\-ical nerves. SIMPLE AMPUTATION OF THE BREAST Simple amputation of the breast is performed by field-block, whichhas become the routine procedure for that operation in a great many. ~^^ ...y Fig. 259.—Field-block for simple amputation of the breast. The arrows show the direc-tion of the deep injections beneath the gland. institutions. A certain number of wheals are raised around the breastand at a little distance from it (Fig. 259), and through these whealsdeep injections are made beneath the gland, so as to check the sensorycontribution brought in by the upper thoracic nerves approaching the 340 REGIONAL ANESTHESIA gland from the pectoralis major muscle. For so doing, the gland israised and retracted inward by the left hand to facilitate the insertionof the needle beneath it (Fig. 260). If the needle encounters resistancein the depth, it means that it has passed into the gland. It should beremoved and reintroduced more backward. The retroglandular tissueoffers no resistance to the point of the needle, since it is composed ofloose connective tissue. Care should be exercised not to pass the needle
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