Re: what happened to the passengers of flight 93? Â« Reply #17 on: May 06, 2011, 05:33:51 pm Â». There are a lot of different theories on here about what happened. I must say that flight 93 might be the the part of 9/11 that I'm the most undecided on.here are a lot of different theories on here about what happened. I must say that flight 93 might be the the part of 9/11 that I'm the most undecided on.
Atrial fibrillation and atrial flutter are very fast electrical discharge patterns that make the atria contract very rapidly, with some of the electrical impulses reaching the ventricles and causing them to contract irregularly, faster, and less efficiently than normal.
First degree AV block: This is an atrial-paced rhythm with a prolonged PR interval, but with conduction of every atrial beat to the ventricle. The PR interval exceeds 0.2 seconds. Second degree atrioventricular block is an atrial-paced rhythm where some, but not all, of the atrial beats are blocked from the ventricle.his is an atrial-paced rhythm with a prolonged PR interval, but with conduction of every atrial beat to the ventricle. The PR interval exceeds 0.2 seconds. Second degree atrioventricular block is an atrial-paced rhythm where some, but not all, of the atrial beats are blocked from the ventricle.