PNB 2265 Lecture Notes - Lecture 9: Ventricular Fibrillation, Atrial Fibrillation, Atrioventricular Node

• School: UConn
• Department: Physiology and Neurobiology
• Course: PNB 2265
• Professor: Kristen Kimball

Document Summary

Bradycardia: still see all the waves, everything is still there but less frequency: more spread out. Tachycardia: fast heart rate, more frequency: stress and exercise, still very coordinated, qrs are still evenly spaced apart. Av block: no coordination of contractility (no/reduced qrs: not functioning properly, travel to atria, hit av node, severe delay/no conduction (instead of small delay, a lot of p wave: atrial depolarization, qrs and t barely present. Maybe qrs a little bit because still have atrial repolarization. Long qt syndrome: slow recovery from contraction may lead to vfib, within t wave, time for ventricles to repolarize is slower. P-q interval: time between atrial depolarization and ventricular depolarization: ap is going to av node. Fibrillation: not tachycardia (cid:523)what"s different? (cid:524: atrial fibrillation: uncoordinated contraction of atria and ventricles. No p wave: ekg has uncoordinated electrical activity. Even uncoordinated in atria, nothing wrong with av, so pockets of depolarization send signal to ventricles, still see qrs (relatively normal)