A little bit of a trivial matter for a serious (in the 2000's? Mmmmm) drama, but this has been something I've kept coming back to address that the second theme song these days, is nothing, nothing, compared to the first theme, and I'll tell you why.
Although both themes are basically the same tune, it just isn't the same! The first theme does have an authentic medical-sounding repertoire of instruments, while the second theme uses classical violins with no beeps or frills. The first one actually sound like it could be Hospital instruments making some of the music in the background, which is what they do try to make you believe in some of the intro visuals, such as a ventilator and such. Although the 2nd theme sounds more morbid, the first one is what keeps me coming back to these videos. Some of the intro's are great, even our 2000's cousins, however, I'm being honest here, but simply the best opening sequence, is the one that starts at 1 min 57 secs, in this video clip. Reflects the gritty feel of the show it was that time, which won't be coming back. Boo-hoo.
I believe the titles i liked best, were from 1997-2000.