In the past, wireless technology was not in the reach of individuals, so companies did not even consider securing their pacemakers and such. It is sad in these days of technology, there are those who are desperate to commit heinous crimes can do so with such ease. Before, to steal millions of pounds, you had to plan a bank robbery that involved arranging getaway drivers and such. Nowadays it can be a one man job and clicks of mouse and keyboard.
In these times, it is imperative that everyone from the ground up actually learn to improve their systems to be secure. You also have to be able to maintain your system because the cracker will always want to crack the system, so be ready to update the system with better security.
I guess as a short term measure, they will have to get those wearing pacemakers and such to wear some kind of Faraday's cage around their chest area. I hope no one patents this because there is prior art here.