5．对本案例如何进行病因分析？（15 分）
["\u8be5\u6c42\u52a9\u8005\u51fa\u73b0\u7cbe\u795e\u95ee\u9898\u7684\u539f\u56e0\u53ef\u80fd\u662f\uff1a(1)\u751f\u7269\u539f\u56e0\uff1a\u6c42\u52a9\u8005\u4e3a\u5973\u6027\uff0c48 \u5c81\uff0c\u5904\u4e8e\u66f4\u5e74\u671f\uff1b\u5e7c\u5e74\u8eab\u4f53\u5065\u5eb7\uff0c\u6709\u5144\u59d0\u5f1f\u4e94\u4eba\uff0c\u6392\u884c\u7b2c\u56db\uff0c\u5144\u59b9\u95f4\u611f\u60c5\u4e00\u822c\u3002(2)\u793e\u4f1a\u539f\u56e0\uff1a\u2460\u534a\u5e74\u524d\uff0c \u7531\u4e8e\u673a\u6784\u6539\u9769\uff0c\u5355\u4f4d\u5b89\u6392\u7b26\u5408\u6761\u4ef6\u7684\u4eba\u5458\u79bb\u5c97\u9000\u517b\uff0c\u81ea\u5df1\u5728\u540d\u5355\u4e4b\u4e2d\uff0c \u5fc3\u60c5\u5341\u5206\u77db\u76fe\uff0c \u4e0d\u7533\u8bf7\u79bb\u5c97\u9000\u517b\u53c8\u6015\u9519\u5931\u673a\u4f1a\uff0c\u7533\u8bf7\u79bb\u5c97\u9000\u517b\uff0c\u81ea\u5df1\u5c1a\u4e14\u80fd\u8dd1\u80fd\u5e72\uff0c \u51b5\u4e14\u6ca1\u6709\u4ec0\u4e48\u670b\u53cb\uff0c\u4e5f\u6ca1\u6709\u4ec0\u4e48\u4e1a\u4f59\u7231\u597d\uff0c\u9000\u517b\u540e\u4e0d\u77e5\u5982\u4f55\u6253\u53d1\u65f6\u95f4\uff0c\u6545\u65f6\u5e38\u60c5\u7eea\u7d27\u5f20\uff0c\u7126\u8651\u4e0d\u5b89\u3002\u2461\u5e73\u7d20\u529e\u4e8b\u8ba4\u771f\u3001\u523b\u677f\uff0c\u8bf4\u8bdd\u76f4\u6765\u76f4\u53bb\uff0c\u4e0d\u4f1a\u8f6c\u5f2f\u62b9\u89d2\uff0c\u6545\u4e0e\u540c\u4e8b\u5173\u7cfb\u4e00\u822c\u3002\u2462\u4eba\u9645\u4ea4\u5f80\u8f83\u5c11\uff0c\u670b\u53cb\u4e0d\u591a\u3002\u2463\u7f3a\u4e4f\u5bb6\u957f\u3001\u6559\u5e08\u3001\u540c\u5b66\u7b49\u793e\u4f1a\u652f\u6301\u7cfb\u7edf\u7684\u6709\u6548\u5e2e\u52a9\u3002\u2464\u4e0d\u4f1a\u6253\u6251\u514b\uff0c\u5f88\u5c11\u542c\u97f3\u4e50\uff0c\u4e0d\u559c\u6b22\u4f53\u80b2\u6d3b\u52a8\u3002(3)\u5fc3\u7406\u539f\u56e0\uff1a\u2460\u5e73\u7d20\u529e\u4e8b\u8ba4\u771f\u3001\u523b\u677f\u7684\u6027\u683c\u662f\u5176\u6025\u6027\u7126\u8651\u6613\u611f\u6027\u7684\u4eba\u683c\u57fa\u7840\u3002\u2461\u6c42\u52a9\u8005\u5b58\u5728\u5185\u5fc3\u51b2\u7a81\uff0c\u65e2\u6015\u9519\u5931\u673a\u4f1a\uff0c\u53c8\u4e0d\u7518\u5fc3\u79bb\u5c97\u9000\u517b\u3002"]