Medical Assistant – EKG Questions and Answers | Latest Version | 2025/2026 | Correct & Verified

Medical Assistant – EKG Questions and Answers | Latest Version | 2025/2026 | Correct & Verified What is the primary purpose of an electrocardiogram (EKG)? To measure the electrical activity of the heart and detect abnormalities in heart rhythm. Which electrode placement is used for a standard 12-lead EKG? Limb electrodes on both arms and legs and six chest electrodes. What does the P wave on an EKG represent? Atrial depolarization, indicating contraction of the atria. What does the QRS complex represent? Ventricular depolarization, indicating contraction of the ventricles. What does the T wave on an EKG indicate? Ventricular repolarization, showing the heart preparing for the next beat. 2 What is the normal duration of a PR interval? 0.12 to 0.20 seconds. What is the normal duration of a QRS complex? 0.06 to 0.10 seconds. Why is it important to ensure proper skin preparation before placing EKG electrodes? To reduce interference and ensure accurate readings. How can a medical assistant reduce EKG artifact from muscle tremors? Instruct the patient to relax and remain still during the procedure. What could cause a wandering baseline on an EKG strip? Loose electrodes, patient movement, or breathing pattern variations. What is the correct placement for the V1 chest lead? Fourth intercostal space, right sternal border. 3 What is the correct placement for the V2 chest lead? Fourth intercostal space, left sternal border. What is the correct placement for the V4 chest lead? Fifth intercostal space, midclavicular line. What is the correct placement for the V5 chest lead? Level with V4, anterior axillary line. What is the correct placement for the V6 chest lead? Level with V4 and V5, midaxillary line. What is the standard paper speed for an EKG recording? 25 mm/sec. What is the standard voltage calibration for an EKG? 10 mm/mV. 4 Why should a medical assistant verify patient identity before performing an EKG? To ensure the results are correctly matched to the patient’s medical record. What does a flat or inverted T wave indicate? Possible ischemia, electrolyte imbalance, or myocardial injury. What is the purpose of a stress EKG?