. Regional anesthesia : its technic and clinical application . ^ of the injected nerves has become part of it is still sensitive, supplementary paravertebral injections OPERATIONS ON THE ABDOMEN. Fig. 271.—Field-block for left rectus colostomy. The dots are the points of en-trance of the needle along the costal margin and from the tip of the eleventh rib tothe iliac crest. 376 REGIONAL ANESTHESIA are made of the nerve or nerves responsible for the existing condition,and ten minutes allowed before the operation is begun. Of the two procedures, the paravertebral block is the one o
. Regional anesthesia : its technic and clinical application . ^ of the injected nerves has become part of it is still sensitive, supplementary paravertebral injections OPERATIONS ON THE ABDOMEN. Fig. 271.—Field-block for left rectus colostomy. The dots are the points of en-trance of the needle along the costal margin and from the tip of the eleventh rib tothe iliac crest. 376 REGIONAL ANESTHESIA are made of the nerve or nerves responsible for the existing condition,and ten minutes allowed before the operation is begun. Of the two procedures, the paravertebral block is the one of choice,because it affords a wider field of anesthesia and greater facility inhandling the bowel, in case the mesocolon is short; but it is more diffi-cult than the abdominal field-block, and in order to give it successfully,fairly good training is required. Paravertebral block thus performeddoes not abolish the abdominal sensation present during exploration,but it lessens it to a certain extent. In the majority of cases thecolostomy is performed painlessly without the aid of ether or gas. If regional anesthesia is to be induced by the average surgeon, pref-erence should be given to the abdominal fie
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