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

EKG Acquisition (NHA) Questions and Answers | Latest Version | 2025/2026 | Correct & Verified How many total electrodes are used in a standard 12-lead EKG? 10 What is the correct placement for V4? Fifth intercostal space at the midclavicular line Which lead is called the augmented voltage left (aVL) lead? Left arm to the average of the other limb electrodes What is the standard gain setting for an EKG machine? 10 mm/mV Which artifact appears as a wandering baseline on an EKG tracing? Loose electrode artifact 2 Why is it important to check the EKG machine calibration before recording? To ensure accurate measurement of waveforms What is the standard paper speed for an EKG recording? 25 mm/sec Which lead is considered the ground or neutral lead in a 12-lead EKG? Right leg lead Why is it important to clean the skin before applying EKG electrodes? To reduce impedance and improve signal quality Where is the V1 chest electrode placed? Fourth intercostal space at the right sternal border Which electrode placement is directly opposite V1 on the chest? V2, fourth intercostal space at the left sternal border 3 How many limb leads are used in a standard 12-lead EKG? Four Which lead provides a view of the inferior wall of the heart? Leads II, III, and aVF Which EKG artifact is caused by patient movement? Somatic tremor Why should a patient be relaxed and still during EKG acquisition? To prevent motion artifacts that distort the reading What is the purpose of a precordial lead? To measure electrical activity across the anterior chest Which limb lead is used to detect electrical activity from the left arm to the right leg? Lead II 4 Where is the V6 electrode placed? Fifth intercostal space at the midaxillary line What does the P wave represent on an EKG? Atrial depolarization Which waveform indicates ventricular depolarization? QRS complex What does the T wave represent? Ventricular repolarization Which artifact is caused by electrical interference from other equipment? AC interference Why should the patient avoid talking during the EKG? To prevent muscle artifact from affecting