求翻译：膀胱全切肠代膀胱术前患者因长期的疾病消耗、焦虑恐惧等机体应激状态及术前禁食、服用缓泻剂、灌肠等肠道准备而加重了营养不足，致使术后容易发生创伤愈合延迟、感染等并发症。本实验以简易营养评定法及膳食调查法来检测该类患者术前营养状况及免疫功能水平，据此制定出膀胱全切肠代膀胱患者术前一周膳食食谱，随后对实验组患者从术前一周开始依照实验食谱进行膳食干预。以达到改善患者术前营养状况,提高免疫功能, 使患者的术前营养预测指数PNI是什么意思？

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bladder and bowel generation all the pre-operative patient bladder due to the long-term diseases such as fear, anxiety and stress organisms preoperative fasting, and taking the laxatives, such as an enema, and increased bowel preparation, due to the lack of nutrition after surgery healing delay pron

Complete cystectomy and intestinal urinary bladder surgery in patients with long-term diseases before consumption, such as fear, anxiety, stress and preoperative fasting and bowel preparation taking sustained laxative, enema is exacerbated by inadequate nutrition, prone to delayed wound healing a