Unscheduled return visits by patients to a german emergency department are a high risk group for initial wrong diagnosis.

The aim was to classify patients who returned unscheduled to an emergency department within 7 days. We categorized the patients' cases arbitrarily according to the underlying cause of the return. The main causes for returning unscheduled were: "patient related" (24,2%), "illness related" (35,4%), "physician related" (18,3%), "system related" (3,8%) and "other" (21,7%). We also analyzed missed diagnoses, as the literature describes this special patient population as a high risk group. 15,4% of all return cases had a wrong diagnosis. No typical risk constellation/symptom could be found. Vital signs or blood values were within normal limits as well.

[Pyoderma gangrenosum following AICD implantation: differential diagnosis to necrotizing fasciitis]. / Pyoderma gangraenosum nach AICD-Implantation: Differenzialdiagnose zur nekrotisierenden Fasziitis.

Pyoderma gangrenosum is rarely seen in the surgical disciplines. In the described case the patient was initially diagnosed with necrotizing fasciitis and admitted to the intensive care unit suffering from septic shock. The automated implantable cardioverter defibrillator (AICD), the suspected focus for infection, had already been removed. Following weeks of broad spectrum antibiotics and wound debridement without clinical improvement the alternative diagnosis of pyoderma gangrenosum was reached. Consequently the patient was treated with immunosuppressive therapy and his condition improved rapidly such that he was ultimately discharged to rehabilitation.