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

NHA EKG Practice Test Questions and Answers | Latest Version | 2025/2026 | Correct & Verified Which rhythm shows regular QRS complexes with no preceding P waves and a rate of 40–60 bpm? Junctional rhythm What is the normal duration of a QRS complex? 0.06–0.10 seconds Which EKG finding is common in pericarditis? ST-segment elevation in multiple leads with PR-segment depression Which rhythm is chaotic with no identifiable P, QRS, or T waves? Ventricular fibrillation Which electrode placement is correct for lead aVR? Right arm positive 2 Which action is important before starting a Holter monitor? Explain procedure and ensure electrode adhesion Which rhythm shows grouped QRS complexes followed by a pause? Second-degree AV block, Mobitz type II Which EKG artifact is caused by electrical interference from nearby equipment? 60-cycle interference Which rhythm is characterized by rapid, irregular, and chaotic ventricular activity? Ventricular fibrillation Which wave is most affected by electrolyte disturbances such as hyperkalemia? T wave Which EKG finding indicates bundle branch block? Wide QRS with secondary R wave pattern in chest leads 3 Which lead placement is used to monitor lateral myocardial infarction? Leads I, aVL, V5, and V6 What is the normal range for an adult resting heart rate? 60–100 beats per minute Which wave on an EKG represents atrial depolarization? P wave Which segment represents the time between ventricular depolarization and repolarization? ST segment What is the first step a medical assistant should take before applying EKG electrodes? Clean and dry the patient’s skin Which lead placement is standard for lead II in a 12-lead EKG? Right arm negative, left leg positive 4 Which heart rhythm is characterized by no discernible P waves and an irregular ventricular response? Atrial fibrillation What is the normal PR interval duration in seconds? 0.12–0.20 seconds Which EKG wave represents ventricular depolarization? QRS complex What should a medical assistant do if the EKG tracing shows a wandering baseline? Check electrode placement and skin preparation Which lead is considered the “rhythm lead” commonly used for continuous monitoring? Lead II What does a prolonged QT interval indicate?