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因肠壁缺血而梗塞时,需在术中对肠壁的活力作出正确的估计,从而确定切除的范围。如果保留了无括力的组织,可导致穿孔、吻合口裂开或狭窄形成。临床指标,如肠管的色泽及蠕动,均不可靠。光容积描记法,就是利用血色素吸收红外线的变化去测定组织血容量的变化。该法曾应用于整形外科,以测定皮瓣的活力。也应用于血管外科,以测定重建血管的有效性及截肢的平面。作者用狗作实验,开腹后结紥肠系膜血管,依次用 Doppler 超声法,红外线容积描记法,最后在暗室内用静脉莹光法,测定肠系膜缘及对肠系膜缘的血流情况,每次都从正常组织(近端)到缺血部分(远端)。对以上各种方法的敏感性、特异性作一比较,以期在坏死分界线出现前的早期缺血,作出判断。
Due to ischemia of the intestinal wall and infarction, the wall of the intestinal activity in the surgery to make the right estimate, to determine the scope of resection. If you leave the organization without force, can lead to perforation, anastomotic dehiscence or stenosis. Clinical indicators, such as intestinal color and peristalsis, are not reliable. Light volume tracing method, is the use of hemoglobin changes in infrared absorption to determine changes in tissue volume. The law has been applied to plastic surgery to determine the vitality of the flap. It is also used in vascular surgery to determine the effectiveness of reconstructed blood vessels and the amputation plane. The authors used the dog as an experiment, laparotomy mesenteric vessels after laparotomy, followed by Doppler ultrasound, infra-red plethysmography, and finally in the dark room with intravenous fluorescence method to determine the mesenteric margin and the mesenteric margin of the blood flow, each time From normal tissue (proximal) to ischemic (distal). The above methods of sensitivity, specificity for a comparison, in order to appear before the necrotic boundary line of early ischemia, to make judgments.