Which of the following is an example of a sentinel event?

A sentinel event is an unexpected occurrence involving death or serious physical or psychological injury, or the risk thereof. It signifies a significant patient safety concern and typically prompts immediate investigation and response to prevent recurrence. In this case, the unexpected death clearly fits the definition of a sentinel event, as it indicates a severe outcome and a potential failure in care that necessitates thorough analysis to identify contributing factors and implement improvements in healthcare processes.

In contrast, the other options do not involve critical incidents that could indicate serious failures in patient safety. Routine patient discharge is a standard procedure and typically does not imply any risk or harm. Successful surgery, while important, is a positive outcome rather than an event that raises safety concerns. A minor allergic reaction, although it warrants attention, generally does not reach the threshold of seriousness that would align it with sentinel events, particularly if it is managed appropriately without significant injury.