Dtsch Arztebl Int
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Serial killing by doctors or nurses is rare. When it occurs, it is generally only detected after multiple homicides by the same perpetrator have escaped detection in the past. The persons at greatest risk are multimorbid elderly patients whose sudden death for natural reasons would not come as a surprise. However, patients' risk of falling victim to homicide is increased only if such vulnerable patients are exposed to perpetrators with certain personality traits. In this situation, homicides can be committed in which little or no evidence of the crime is left behind. In this review, we address the frequency, nature, and circumstances of serial killings and attempted serial killings in hospitals, nursing homes, and nursing care. ⋯ Irregularities in drug stocks, inexplicably empty drug packages and used syringes, erratic behavior of a staff member before and after a patient's death, or a cluster of unexpected deaths mainly involving elderly, multimorbid patients (detectable from internal mortality statistics) should always lead to further questioning and investigation.