An example of a system for review of clinical data includes a medical device configured to receive patient data signals from patient interface devices coupled to the medical device, and an auxiliary device configured to communicatively couple to the medical device via a communication channel and including an output device, a memory, a communication interface, and a processor configured to establish the communication channel, estimate a transmission age for the patient data, receive the patient data from the medical device via the communication channel, determine a patient data age based on at least one of the transmission age and a playback selection age, select a patient data age threshold based on a patient data context, compare the patient data age to the patient data age threshold to determine a patient data age indication, and provide the patient data and the patient data age indication at the output device.