I don't feel sorry for them.
Medical confidentiality should be sacrosanct. Giving people their privacy in hospital is just common decency. That's why some of the stuff that came out at Leveson was so shocking - stealing the records of Gordon Brown's son etc. That's private, it shouldn't be accessible to the media.
The DJs knew that they were breaking that privacy, and they didn't have enough instinctive morality to say 'no, that's a hospital, the people we'd be distracting would be nurses who would otherwise be caring for sick people, and that's someone's private medical condition, so that's not funny'. They were still boasting about what they'd done on Twitter with no thought of how it might have affected the nurse and receptionist, and the radio station were still playing the clip after Jacintha's suicide had been confirmed.
Even if this suicide hadn't occurred, did they not think that the nurse and receptionist would be suffering terrible humiliation, shame and fear of losing their jobs? The DJs weren't sorry until it started to look like it might affect their career.
And the repeated 'we thought they'd just hang up on us'. Well could they not hear the accents of the people working at the hospital? It's hard to spot a 'bad accent' if English isn't your first language and many of the dedicated and essential staff in British hospitals speak English as a second language. They're not qualified in linguistics. It's a way of deflecting blame back onto the people who took the call (Jacintha and the nurse) for not spotting them instead of knowing that they just shouldn't have played the prank in the first place.
And I don't think you have to have a pre-existing mental health condition to be at risk of suicide when suddenly placed under extreme stress, especially where shame is a factor.
Bleargh. Don't feel sorry for them. They're polluting my keyboard by my even typing about them. Self-promoting media types.