NHA EKG practice test questions & answers ( A+ GRADED 100% VERIFIED) 2023

NHA EKG practice test What is the purpose of an EKG? - ANSWER Records the electrical activity of the heart Why would a physician request an exercise stress test? - ANSWER Symptoms of chest pain (angina); dizziness; palpitations What is the normal running speed of the EKG paper? - ANSWER 25 mm/sec 1 small square on the horizontal axis of the EKG paper equals: - ANSWER .04 sec What does the vertical axis of the EKG paper measure? - ANSWER Voltage/ amplitude How does the stylus mark the EKG paper? - ANSWER Heat What is the normal sensitivity level for running an EKG? - ANSWER 1 (indicated by a calibration box of 10 mm) A normal calibration mark should measure: - ANSWER 10 mm (1) Increase gain when QRS are too big to make smaller - ANSWER 5 mm (.5) Decrease gain when QRS are too small to make bigger - ANSWER 20 mm (2) How many electrodes are attached to the patient for holter monitoring? - ANSWER 5 4th intercostal space, right side of sternum - ANSWER V1 4th intercostal space, left side of sternum - ANSWER V2 Midpoint between V2 and V4 is: - ANSWER V3 5th intercostal space; left midclavicular line: - ANSWER V4 Anterior axillary line on the same horizontal level as V4 - ANSWER V5 5th intercostal space, left midaxillary line: - ANSWER V6 Augmented lead with positive electrode on the left arm - ANSWER aVL Augmented lead with positive electrode on the left leg - ANSWER aVF Augmented lead with positive electrode on the right arm: - ANSWER aVR Limb lead from the right arm to the left leg is: - ANSWER II Limb lead from the right arm to the left arm is: - ANSWER I Limb lead from the left arm to the left leg is: - ANSWER III Normal PR interval - ANSWER .12-.20 seconds (120-200 milliseconds); represents the impulse traveling the entire conduction pathway Normal QRS complex interval - ANSWER 0.06-0.12 sec; narrow and sharply pointed Normal P wave amplitude and duration - ANSWER 0.5-2.5 mm; 0.06-0.10 sec Normal QRS amplitude - ANSWER 5-30mm The intrinsic rate of the AV node - ANSWER 40-60 bpm The proper electrode placement for holter monitoring is: - ANSWER Anterior trunk of the body Ventricular repolarization results in - ANSWER myocardial relaxation