CASAL II OA SWTUDY GUIDE

SA node - Answer- pacemaker, 60-100bpm,Depolarization R atria, p wave, AV node - Answer- Gatekeeper, intraseptal, Allows delay for blood so no back up, 40-60 bpm Bundle of His - Answer- Intraventricular, 40-60bpm, sends to purkinje fibers for ventricular depolarization L and R bundle branches - Answer- 20-40bpm, Purkinje fibers - Answer- 20-40bpm, ventricular depolarization (QRS) complex Preload - Answer- LVEDP determined by LVEDV Afterload - Answer- Vascular resistance Cardiac output = - Answer- heart rate x stroke volume Normal QRS complex - Answer- 0.06-0.12 sec. (1.5-3 small boxes) P wave - Answer- atrial depolarization QRS complex - Answer- ventricular depolarization T wave - Answer- ventricular repolarization U wave - Answer- hypokalemia, depolarization purkinje fibers A Fib on EKG - Answer- 1. P waves? No 2. P waves regular? U/A to determine 3. R waves regular? No irregular 4. How many R waves in 6 sec? 5. PR interval length? No, no p waves Saw tooth No p waves R waves irregular Stroke volume - Answer- the volume of blood pumped out by a ventricle with each heartbeat Cardiac output - Answer- Amount of blood pumped through body per min 3 t