EKG Certification Exam
What does the P wave represent? - ✔✔atrial contraction
Define: Repolarization - ✔✔when the heart recovers electronically
Define: Depolarization - ✔✔contraction of cardiac cells
What does the QR
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EKG Certification Exam
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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