Mayo EKG Competency EXAM STUDY GUIDE 2026/2027 COMPLETE QUESTIONS WITH VERIFIED CORRECT ANSWERS || 100% GUARANTEED PASS NEWEST VERSION

Mayo EKG Competency EXAM STUDY GUIDE 2026/2027 COMPLETE QUESTIONS WITH VERIFIED CORRECT ANSWERS || 100% GUARANTEED PASS NEWEST VERSION What is the purpose of ECG? - ANSWER Measures electrical physiology of the heart, rate/rhythm, and electrical activity. The pacemaker site within the ________ generally controls the heart. - ANSWER Atria The sympathetic nervous system ___________ heart rate, conduction, and irritability. - ANSWER INCREASES The parasympathetic nervous system ___________ heart rate, conduction, and irritability. - ANSWER DECREASES PR Interval - ANSWER 0.12-0.20, 3-5 small boxes QRS Complex - ANSWER 0.12, 3 small boxes QT Interval - ANSWER 0.35-0.43 Refractory Period - ANSWER 2nd half of T wave, where impulses get through Large Square Method - ANSWER # of big squares between two R waves, divided into 300 Small Square Method - ANSWER # of small squares between two R waves, divided into 1500 Sinus Bradycardia - ANSWER Regular 60BPM Uniform P Waves PR = 0.12-0.20 QRS = 0.12 Normal Sinus - ANSWER Regular 60-100 BPM Uniform P Waves PR = 0.12-0.20 QRS = 0.12 Sinus Tachycardia - ANSWER Regular 100 BPM Uniform P Waves PR = 0.12-0.20 QRS = 0.12 Sinus Arrhythmia - ANSWER Irregular Roughly 60-100 BPM PJC - ANSWER Regular or Irregular Rate depends on preexisting rhythm Inverted or hidden P waves QRS = 0.12/may look slightly different than rest Junctional Tachycardia - ANSWER Regular 100-180 BPM Hidden, inverted P wave PR = 0.12 QRS = 0.12/Normal SVT/Atrial Tachycardia - ANSWER Regular R-R intervals Rate 150-210 BPM Hidden P waves PRI = 0.12 QRS = 0.12/Normal A-Fib - ANSWER Irregular Atrial rate = 300 Hidden/No P waves QRS = 0.12/Normal Atrial Flutter - ANSWER Atrial Rate = Regular Ventricular Rate = Regular/Irregular Rate = 250-450 Sawtooth-shaped P waves, no PRI QRS = 0.12/Normal, sometimes patterns PVC - ANSWER No P wave preceding PRI = 0.12, if any QRS = WIDE AND BIZARRE T wave is opposite Sometimes multifocal V-Fib - ANSWER Chaos! No identifiable rhythms Sudden cardiac death PAC - ANSWER Regularity depends on underlying rhythm Rate depends on rhythm P waves are in front of QRS but look different than others PRI = 0.12-0.20, but can be greater QRS = 0.12/Normal QRS wave - ANSWER Ventricular depolarization Less than or equal to 0.12 seconds