I still don´t believe Shannon´s lying on her ass attitude has anything to do with her asthma, I think she would have said so if fear was her (de)motivator. Maybe we will learn more next week.
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I notice the incompetent CPR on TV and my theory is that, since the actor is performing CPR on a live person, they really can't perform it exactly correctly, can they? Another thing that bugs me is that, please correct me if I'm wrong, CPR alone is unlikely to restart a heart, right? Except on TV, of course.
Well certainly is part of why it can look silly. Of course an actor can´t actually compress the chest of his/her fellow actor, so what happens is that the one doing the CPR bends his/her elbows and bobs ups and down to make it look like he or she is actually compressing a chest.
There are two main different types of cardiac arrest, in both cases the heart is not pumping any blood around. Once a heart stops beating a person (if not already out cold) will lose consciousness after 5-10 seconds. If nothing happens the brain will die in a matter of minutes.
The first is the most common reason people (mostly due to myocardial infarction) drop dead suddenly: ventricular fibrillation. When that happens all the different heart cells are firing of their electrical signals and contracting in a chaotic manner, the heart-muscle is fibrillating but no coördinated contractions occur. CPR will not restart the heart, but it can help the heart and body get enough oxygen and survive long enough until help arrives. The heart will need to be shocked with a defibrillator. It is extremely rare for the heart to regain it´s normal rhythm without cardiac defibrillation.
The other main kind of cardiac arrest is asystolie (less common than ventricular fibrillation) when there is no electrical activity at all, the heart is not contracting (or extreme bradycardia when the heart is beating only a few beats per minute, not enough to keep the blood flowing). In these cases CPR can also help keep the circulation and oxygenation going long enough for help to arrive. In this case defibrillation (shocking the heart) won´t do shit (you do often see them doing it to people who flatline on TV, a flatline means asystolie, shocking won´t help), CPR combined with intravenous medication (like adrenaline) is needed to stimulate the heart or electrical pacing (not the same as defibrillating).
On this show two people have been revived supposedly thanks to wunderkind Dr Jackass: Rose and Charlie. I just rewatched the scene where he performs CPR on Rose. I looked carefully and noticed he did not check for a pulse (for all we know her heart could have been beating just fine, maybe she had only stopped breathing). He did not do it during the few seconds the camera zoomed in on his face either, he was too busy lecturing Boone.
If I had to judge this medically she must have had a respiratory arrest for whatever reason, but her heart was still beating. Mouth to mouth can restart a person´s breathing. If a trauma victim also has a cardiac arrest then there must be much more going on and I find it impossible to believe that manual CPR alone would bring them back. Jack also bitched at Boone for not tilting her head back far enough, well he did not do it either, no proper chin lift or tilting the head back. He was blowing all his hot air into her stomach too. Maybe his bad breath revived her or as I really believe, the magic on that island did it. Charlie is the second one. I could hardly call that chest pounding CPR, if his heart was still beating that might have stopped it, but not restart it.
It is sometimes possible to bring people back with just CPR alone though, mostly in cases where the person has a healthy heart to begin with and the arrest was caused by lack of oxygen (like in drowning) and/or extreme vasovagal (stimulation from the tenth brain nerve, the nervus vagus, causes the heart rate to slow) stimulation (like with strangling). Once a healthy heart gets some oxygen again it can start beating again without the help of iv medication. This of course all depends on how long a person has been out, it takes a while for a healthy heart to stop beating once breathing (and thus the supply of oxygen stops) Charlie could not have been hanging there long for him to come back so quickly without any neurological deficits, no respiratory problems due to swelling of all the structures in his bruised neck, yet he must have been hanging there for longer than one minute.
I am over analyzing this of course, it made no sense that anyone survived that plane crash to begin with, it made no sense that Rose and Charlie would be revived if they had been in full cardiac arrest, but in their case I think we are meant to accept that Jack revived them because he is such a spiffy doctor.
There, aren´t you glad you asked now.
Edited by: DrG at: 1/9/05 10:27 am