查阅病历有回顾性调查和前瞻性调查两种方法。回顾性调查是目前国内较常用的方法，这种方法简单、易行、并能很快得出结果。但由于调查的是已出院患者的病历，追踪观察在我国尚有一定困难的情况下，常会出现个别疑似医院感染病历，归纳起来，这类病历有如下４个特点。１缺... There are retrospective investigations and prospective investigations of medical records. Retrospective surveys are currently the most commonly used methods in China. This method is simple, easy, and able to produce results quickly. However, since the patient’s medical records have been investigated and the follow-up observations have certain difficulties in China, there are often cases of individual suspected hospital infections. To sum up, these medical records have the following four characteristics. 1 missing...