Heart Conduction

Question 1

A part of an EKG signwave

The electrical activity associated w/SA node impulse and depolarization of the atria

1st signwave on output reading- just b4 QRS complex

Answer 1

P wave

Question 2

Parts of an EKG signwave

Only lasts for 0.12 - 0.2 sec. This is how long it takes the SA node 2 fire, atria 2 depolarize and electricity 2 travel through the AV node

Includes P wave and PR segment on readout; from the beginning of the (+) deflection of the P wave until the (-) deflection of the QRS complex

Answer 2

PR interval

Question 3

Part of an EKG signwave

Lasts 0.04 - 0.2 seconds; the time it takes 4 ventricles 2 depolarize

Starts at the end of the PR segment and ends at the beginning of the ST segment

Answer 3

QRS complex

Question 4

Part of an EKG signwave

Represents the early phase of ventricular repolarization

Shape is important when looking 4 signs of ischemia (reduced blood flow 2 organs)

Begins at the end of the QRS complex and ends at the beginning of the T wave

Answer 4

ST segment

Question 5

Represents the point of time when ventricular depolarization stops and ventricular repolarization starts

Occurs at the end of the QRS complex where the ST segment begins

During ischemia, this can elevate or depress below the baseline

Answer 5

J point

Question 6

Part of an EKG signwave

1 complete ventricular cycle; from beginning of the Q wave 2 the end of the T wave

Includes QRS complex, ST interval and the T wave

Answer 6

QT interval

Question 7

Part of an EKG signwave

Represents the amount of time between atrial depolarization cycles

It’s measured from the beginning of a P wave 2 the beginning of the next P wave

Answer 7

PP interval

Question 8

Part of an EKG signwave

Represents the amount of time between ventricular depolarization cycles

It’s measured from the beginning of a R wave 2 the beginning of the next R wave

Answer 8

RR interval