UCLA EKG EXAM TEST QUESTIONS AND CORRECT ANSWERS

1. What is the normal rate for a sinus rhythm? a) 40-60 bpm b) 60-100 bpm c) 100-150 bpm d) 150-200 bpm ANSWER: b) 60-100 bpm 2. The PR interval represents the conduction time from the: a) Atria to the Ventricles b) SA node to the AV node c) AV node to the Purkinje fibers d) Ventricles to the Atria ANSWER: a) Atria to the Ventricles 3. A QRS complex duration greater than 0.12 seconds indicates: a) Normal intraventricular conduction b) A delay in atrial depolarization c) A delay in ventricular depolarization d) A prolonged repolarization time ANSWER: c) A delay in ventricular depolarization 4. Which lead is primarily used to view the inferior wall of the left ventricle? a) V1 b) aVL c) II, III, aVF d) V5, V6 ANSWER: c) II, III, aVF 5. The "P wave" on an EKG corresponds to: a) Ventricular depolarization b) Atrial depolarization c) Ventricular repolarization d) Atrial repolarization ANSWER: b) Atrial depolarization 6. What is the most likely diagnosis for a rhythm that is irregularly irregular with no discernible P waves? a) Sinus Arrhythmia b) Atrial Fibrillation c) Ventricular Tachycardia d) First-Degree AV Block ANSWER: b) Atrial Fibrillation 7. ST segment elevation is most characteristic of: a) Hypokalemia b) An acute myocardial infarction c) Digoxin effect d) Hypercalcemia ANSWER: b) An acute myocardial infarction 8. A "U wave" is most commonly associated with: a) Hyperkalemia b) Hypokalemia c) Hypercalcemia d) Hypocalcemia ANSWER: b) Hypokalemia 9. The normal duration for a QRS complex is: a) < 0.20 seconds b) < 0.12 seconds c) < 0.06 seconds d) < 0.44 seconds ANSWER: b) < 0.12 seconds 10. In a right bundle branch block, the characteristic wide QRS pattern is seen best in lead: a) V1 b) V6 c) aVF d) I ANSWER: a) V1 11. Tall, peaked T-waves are a classic early sign of: a) Hypokalemia b) Hyperkalemia c) Hypocalcemia d) Hypercalcemia ANSWER: b) Hyperkalemia 12. The QT interval represents: a) Atrial depolarization and repolarization b) Ventricular depolarization only c) Total ventricular activity (depolarization and repolarization) d) The delay at the AV node ANSWER: c) Total ventricular activity (depolarization and repolarization) 13. A prolonged QT interval increases the risk for: a) Atrial Flutter b) Torsades de Pointes c) Supraventricular Tachycardia d) Sinus Bradycardia ANSWER: b) Torsades de Pointes 14. Which of the following is a characteristic of Third-Degree (Complete) AV Block? a) A progressively lengthening PR interval b) More P waves than QRS complexes, with no relationship between them c) A constant, prolonged PR interval d) Dropped QRS complexes after a P wave ANSWER: b) More P waves than QRS complexes, with no relationship between them 15. The "J point" is defined as the: a) Start of the P wave b) End of the T wave c) Point where the QRS complex ends and the ST segment begins d) Peak of the R wave ANSWER: c) Point where the QRS complex ends and the ST segment begins 16. A patient with chest pain has 2mm ST segment depression in leads V5 and V6. This suggests ischemia in the: a) Anterior wall b) Inferior wall c) Lateral wall d) Septal wall ANSWER: c) Lateral wall 17. What is the hallmark EKG finding in Pericarditis? a) Localized ST elevation b) Widespread, concave-up ST elevation in most leads c) ST depression in V1-V3 d) Deep Q waves in inferior leads ANSWER: b) Widespread, concave-up ST elevation in most leads 18. The "Mobitz Type I" (Wenckebach) second-degree AV block is characterized by: a) A constant PR interval with occasional dropped QRS complexes b) A progressively lengthening PR interval until a QRS complex is dropped c) More P waves than QRS complexes with no correlation d) A fixed, prolonged PR interval ANSWER: b) A progressively lengthening PR interval until a QRS complex is dropped 19. In Left Bundle Branch Block (LBBB), the QRS complex is typically widened to: a) > 0.08 seconds b) > 0.12 seconds c) > 0.20 seconds d) > 0.10 seconds ANSWER: b) > 0.12 seconds 20. The "S1Q3T3" pattern is associated with: a) Acute Inferior MI b) Left Ventricular Hypertrophy c) Acute Pulmonary Embolism d) Hyperkalemia ANSWER: c) Acute Pulmonary Embolism 21. Which lead is considered the "septal" lead? a) V1 b) V4 c) V6 d) aVR ANSWER: a) V1 22. A "Pathologic Q wave" is defined as being greater than ___ in duration. a) 0.02 seconds b) 0.04 seconds c) 0.06 seconds d) 0.10 seconds ANSWER: b) 0.04 seconds 23. The "aVR" lead views the: a) Left lateral ventricle b) Right ventricle c) Cavity of the heart (right side) d) Inferior wall ANSWER: c) Cavity of the heart (right side) 24. A rhythm with a rate of 150 bpm, regular, with saw-toothed waves between QRS complexes is most likely: a) Atrial Fibrillation b) Atrial Flutter c) Ventricular Tachycardia d) Sinus Tachycardia ANSWER: b) Atrial Flutter 25. The "T wave" on an EKG represents: a) Atrial repolarization b) Ventricular depolarization c) Ventricular repolarization d) Atrial depolarization ANSWER: c) Ventricular repolarization 26. Which electrolyte abnormality causes a shortened QT interval? a) Hypokalemia b) Hyperkalemia c) Hypocalcemia d) Hypercalcemia ANSWER: d) Hypercalcemia 27. The "R-R interval" is used to calculate: a) Blood pressure b) Heart rate c) Cardiac output d) Stroke volume ANSWER: b) Heart rate 28. In dextrocardia, which finding would be expected on a standard EKG? a) Poor R-wave progression in V1-V3 b) Decreasing amplitude of QRS complexes from V1 to V6 c) Inverted P waves and QRS complexes in lead I d) ST elevation in aVR ANSWER: c) Inverted P waves and QRS complexes in lead I 29. A "Premature Ventricular Complex (PVC)" is characterized by: a) A narrow QRS complex b) A P wave before the complex c) A wide and bizarre QRS complex d) A normal PR interval ANSWER: c) A wide and bizarre QRS complex 30. The "QTc" is the QT interval corrected for: a) Age b) Blood pressure c) Heart rate d) Sex ANSWER: c) Heart rate 31. Which finding is characteristic of Digoxin toxicity? a) ST segment depression with a "scooped" appearance b) ST segment elevation c) Peaked T waves d) Prolonged PR interval ANSWER: a) ST segment depression with a "scooped" appearance 32. The "Lewis Lead" is a special EKG configuration used to better visualize: a) Ventricular Hypertrophy b) Atrial activity c) ST segment changes d) The QT interval ANSWER: b) Atrial activity 33. A "Junctional Rhythm" typically has a rate of: a) 20-40 bpm b) 40-60 bpm c) 60-100 bpm d) 100-150 bpm ANSWER: b) 40-60 bpm 34. In Wolff-Parkinson-White (WPW) syndrome, the EKG shows: a) A prolonged PR interval b) A shortened PR interval and a delta wave c) ST segment elevation d) T wave inversion ANSWER: b) A shortened PR interval and a delta wave