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.
Atrial Fibrillation. Atrial fibrillation (AF) is characterized by rapid and irregular activation of the atrium. It may be recurrent (paroxysmal) or permanent (chronic). During AF, atrial cells fire at rates of 400-600 times per minute. The filtering function of the atrioventricular node prevents the conduction to the ventricles and therefore results in ineffective cardiac contraction.