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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?


What does the horizontal line on the EKG represent?


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?


How many leads do the sensors record?


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?


Leads IV, V, VI are designated as what leads?

aVr, aVl, aVf

These augmented leads are also known as what?


Lead aVr records activity from?

right arm, right leg

Lead aVl records activity from?

left arm, left leg

Lead aVf records activity from?


What does aVr, aVl, aVf stand for?

augmented voltage right, left and foot

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