Relias Basic Dysrhythmia (Q/A) 2023 Correctly Answered conduction system structures ✔️Ans -SA node, AV node, Bundle of His, Purkinje fibers systole vs diastole ✔️Ans -systole (contraction) and diastole (relaxation) P wave ✔️Ans -atrial depolarization PR interval ✔️Ans -0.12-0.20 delay of AV node to allow filling of ventricles → atrial to ventricular conduction time → time an impulse travels through the atria, through the AV node down to the ventricles → most of this delay is located in the AV node QRS ✔️Ans -ventricular depolarization
0.04-0.12
T wave ✔️Ans -ventricular repolarization ventricles return to resting electrical state ST segment ✔️Ans -→represents early repolarization →extends from end of the QRS to end of the T wave →ST segment should be at the isoelectric line one big box ✔️Ans -0.20 seconds five big boxes ✔️Ans -1 second treatment of sinus brady and tach ✔️Ans -atropine/pacemaker dopamine, epi 1 / 2
underlying cause beta blockers sinus arrest ✔️Ans -dropped beat PACs (premature atrial contractions) ✔️Ans -Impulse originating in the atria which occurs earlier than the next expected sinus beat. This occurrence is due to an irritable, ectopic focus in the atrial tissue SVT rate and treatment ✔️Ans -150-250
stable: adenosine
unstable: cardiovert
junctional rhythm rate ✔️Ans -40-60 bpm P wave in a junctional rhythm ✔️Ans -Depending on where (at which level) in the AV node the impulses start, the P waves will occur before (inverted), during or after the QRS complex inverted absent or after QRS Accelerated Junctional Rhythm ✔️Ans -60-100 bpm Junctional Tachycardia Rate ✔️Ans ->100 bpm Junctional Bradycardia ✔️Ans -40 bpm first degree block ✔️Ans -PR interval >0.2 conduction of impulses from the SA node is delayed more than normal; usually no symptoms
second degree block: Mobitz I ✔️Ans -wenckebach
longer, longer, longer drop
- / 2