In my professional opinion, the episode was not too far off the mark.
Fact! The plastic box on the episode is a commonly used remote monitor/bedside transmitter. The primary use of the bedside transmitter is to read patient data from the pacemaker or ICD and send the data to a physician over the telephone line or network connection. The benefit to this technology is reduced in-person visits to the physician’s clinic. The data can be analyzed remotely, and the physician can determine whether an in-person visit is required.
As there are only a handful of people publicizing security research on medical devices, I was curious to know where the inspiration for this episode came from. I found an interview with the creators of the show where the interviewer asked where the idea for the plot twist came from [3]. The creators said the inspiration for the episode was from an article in the New York Times, where a group of researchers had been able to cause an ICD to deliver jolts of electricity [4].