EKG NHA Questions and Answers | Latest Version | 2025/2026 | Correct & Verified

EKG NHA Questions and Answers | Latest Version | 2025/2026 | Correct & Verified Which rhythm originates in the ventricles and appears early with a wide QRS complex? Premature ventricular contraction Which rhythm originates above the ventricles? Supraventricular tachycardia Which artifact is caused by poor grounding or nearby electrical equipment? 60-cycle interference How many small squares on EKG paper equal 1 second at standard speed? 25 small squares How long does each small square represent at standard paper speed? 0.04 seconds 2 What is the normal heart rate range for an adult? 60–100 beats per minute Which rhythm is regular but slower than normal? Sinus bradycardia Which rhythm is regular but faster than normal? Sinus tachycardia Which action ensures proper electrode adhesion in a patient with oily skin? Clean the skin with alcohol and lightly abrade What is the main purpose of a 12-lead EKG? Assess electrical activity and detect cardiac abnormalities Which rhythm shows rapid, regular atrial contractions with a “flutter” pattern? Atrial flutter 3 Which rhythm has no effective cardiac output and appears chaotic? Ventricular fibrillation What does an EKG measure in the heart? Electrical activity Which wave represents atrial contraction on an EKG? P wave Which complex represents ventricular contraction on an EKG? QRS complex Which wave represents ventricular relaxation on an EKG? T wave What is the normal duration of a QRS complex? 0.06–0.10 seconds 4 What is the normal duration of a PR interval? 0.12–0.20 seconds Which interval measures the time from ventricular depolarization to repolarization? QT interval Which lead placement is standard for monitoring heart rhythm? Lead II Where is the V1 chest electrode placed? Fourth intercostal space at the right sternal border Where is the V6 chest electrode placed?