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

NHA EKG Certification Study Guide Questions and Answers | Latest Version | 2025/2026 | Correct & Verified What is the term for the time from the beginning of the P wave to the beginning of the QRS complex? PR interval What is the normal duration of a PR interval? 0.12–0.20 seconds What is the normal duration of a QRS complex? 0.06–0.10 seconds What is the term for the period from the beginning of the QRS complex to the end of the T wave? QT interval What does a prolonged QT interval indicate? 2 Risk for ventricular arrhythmias Which electrode placement site is correct for V1? Fourth intercostal space at the right sternal border Which electrode placement site is correct for V6? Fifth intercostal space at the midaxillary line What is the standard paper speed for an EKG tracing? 25 mm/sec What is the standard voltage calibration for an EKG machine? 10 mm/mV What is the correct method to prepare the skin for electrode placement? Clean with alcohol and abrade if necessary What is the term for an irregular heart rhythm originating above the ventricles? 3 Supraventricular arrhythmia What is the term for a rhythm that originates in the ventricles? Ventricular arrhythmia What is the first step before performing an EKG on a patient? Verify patient identity and explain the procedure What should a medical assistant do if a patient has a pacemaker before performing an EKG? Document the presence of the pacemaker What artifact is caused by patient movement or tremors? Somatic tremor What artifact results from poor electrode contact with the skin? Wandering baseline What is the term for the flat line between waves in an EKG? 4 Isoelectric line What is the normal range for an adult resting heart rate? 60–100 beats per minute Which lead is considered the standard reference for