NHA EKG Exam/ EKG Course Review Complete Questions and Answers | Latest Version | 2025/2026 | Correct & Verified

NHA EKG Exam/ EKG Course Review Complete Questions and Answers | Latest Version | 2025/2026 | Correct & Verified What is the standard number of leads used in a 12-lead EKG? 12 Which wave represents atrial depolarization on an EKG tracing? P wave Which segment represents the time between ventricular depolarization and repolarization? ST segment Which wave corresponds to ventricular depolarization? QRS complex What is the normal range for a PR interval in adults? 0.12 to 0.20 seconds 2 What is the normal duration of a QRS complex? 0.06 to 0.10 seconds Which wave represents ventricular repolarization? T wave Which lead is considered the standard reference for rhythm analysis? Lead II What is the normal heart rate range for adults on an EKG? 60–100 beats per minute What is the first step in preparing a patient for an EKG? Explain the procedure and obtain consent Where should the V1 electrode be placed on the chest? Fourth intercostal space, right sternal border 3 Where should the V6 electrode be placed? Fifth intercostal space, midaxillary line What is the correct paper speed for a standard EKG? 25 mm/sec Which lead views the lateral wall of the left ventricle? Lead I and aVL Which lead views the inferior wall of the heart? Leads II, III, and aVF Which lead is unipolar and measures electrical activity from the right arm? aVR What should be done if the EKG tracing shows 60-cycle interference? Check for electrical devices and reduce interference 4 Which rhythm is identified by an absent P wave before each QRS complex? Junctional rhythm What rhythm is characterized by a sawtooth pattern of P waves? Atrial flutter Which EKG finding is a hallmark of myocardial infarction? ST-segment elevation Which electrode placement error can cause a poor R-wave progression in precordial leads? Misplacement of chest electrodes Which rhythm shows irregularly irregular R-R intervals and no distinct P waves? Atrial fibrillation What is the correct action if the EKG tracing shows wandering baseline? Check electrode contact and skin preparation 5 Which rhythm has a rate over 100 bpm with normal P waves? Sinus tachycardia Which rhythm has a rate below 60 bpm with normal P waves? Sinus bradycardia Which lead is used as a ground electrode in a standard 12-lead EKG? Right leg Which type of artifact is caused by patient movement? Somatic tremor Which rhythm is identified by premature, wide QRS complexes without preceding P waves? Premature ventricular contraction (PVC) What is the term for a pause in the cardiac cycle caused by delayed conduction through the AV node? 6 Second-degree AV block Which EKG finding suggests hyperkalemia? Peaked T waves Which finding indicates hypokalemia on an EKG? Flattened T waves and U waves Which EKG interval represents the time from