EKG Certification Exam Questions and Answers Already Passed

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EKG Certification Exam Questions and Answers Already Passed What does the P wave represent? ✔✔atrial contraction Define: Repolarization ✔✔when the heart recovers electronically Define: Depolarization ✔✔contraction of cardiac cells What does the QRS wave represent? ✔✔ventricular contraction What does the T wave represent? ✔✔ventricular relaxation Which wave only occurs occasionally in some patients? ✔✔the U wave What does the vertical line on the EKG represent? ✔✔voltage What does the horizontal line on the EKG represent? ✔✔time What is a baseline? ✔✔the flat line that separates the various waves What is one box equal to? ✔✔.04 sec What are 5 large squares equal to? ✔✔.2 sec What does BPM stand for? ✔✔beats per minute What is electrolyte? ✔✔substance used to conduct current better What forms does electrolyte come in? ✔✔gels, lotions, pastes, adhesive pads Why is electrolyte necessary? ✔✔because the skin is a poor conductor of electricity What are electrodes? ✔✔sensors that detect electrical impulses on the body surface What are electrodes made of? ✔✔metal or other conductive material What are lead wires? ✔✔the wires that connect the sensors to the machine How can older electrocardiograph machines be adapted or converted to operate with the current self-adhesive electrodes? ✔✔order a set of alligator clips from the manufacturer How many sensors are on a standard EKG? ✔✔10 How many leads do the sensors record? ✔✔12 What are the sensors recording? ✔✔the electrical activity of the heart What are the four limb leads? ✔✔right arm, left arm, right leg, left leg Which limb lead is called the "ground" or "reference electrode"? ✔✔right leg Where on the limbs are the sensors placed? ✔✔fleshy, non-muscular portion of upper arms and lower legs Lead I records the electrical activity between the... ✔✔right arm and left arm Lead II records the electrical activity between the... ✔✔right arm and left leg Lead III records electrical activity between the... ✔✔left arm and left leg Which lead portrays the heartbeat better than other leads and what is it referred to as? ✔✔lead II and called rhythm strip The first 3 leads are also know as what type of lead? ✔✔bipolar Leads IV, V, VI are designated as what leads? ✔✔aVr, aVl, aVf These augmented leads are also known as what? ✔✔unipolar Lead aVr records activity from? ✔✔right arm, right leg Lead aVl records activity from? ✔✔left arm, left leg Lead aVf records activity from? ✔✔foot What does aVr, aVl, aVf stand for? ✔✔augmented voltage right, left and foot

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