以下为句子列表：
英文: Four patients were treated conservatively with insertion of a nasogastric tube or a long intestinal tube to drain the intestinal fluid, but these patients underwent operations within 12–42 hours of CT examination because of aggravated symptoms.
中文: 4例病人进行了保守治疗包括经鼻胃管或肠管引流肠液，但由于病情恶化，在CT检查后的12—42小时内进行了手术。
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