Telemetry Rhythm

Question 1

What is repolarization?

Answer 1

Period of rest or recovery

During this time no electrical activity is occurring and a straight line is recorded on the ECG

Question 2

What is depolarization?

Answer 2

Period of stimulation

Results from an electrolyte exchange in cardiac cells

It is an electrical event that results in muscle contraction

Question 3

Where is the SA node?

Answer 3

The SA node is located at junction of the superior vena cave and right atrium

Question 4

What is considered the “pacemaker” of the heart?

Answer 4

The SA node

Question 5

What is the rate for the SA node?

Answer 5

60-100 BPM

Question 6

What is the AV node also called?

Answer 6

The GATEKEEPER

Question 7

What does the AV node do?

Answer 7

Controls number of impulses which reach ventricle

Functions as the backup pacemaker

Question 8

What is the rate for the AV node?

Answer 8

40-60 BPM

Question 9

What is the AV node’s goal?

Answer 9

prevent ventricles from contracting before adequate filling occurs

Question 10

What do Purkinje fibers do?

Answer 10

Carries electrical impulse directly to the ventricles

Conduction of the electrical impulse is the fastest of any tissue in the conduction system

Question 11

What is the rate for Purkinje fibers?

Answer 11

20-40 BPM

Question 12

What is a P wave?

Answer 12

First deflection of the cardiac cycle?

Question 13

Characteristics of P wave?

Answer 13

Caused by depolarization of the atria

Begins as the deflection leaves baseline

Ends when deflection returns to baseline

Normal P waves are smooth, rounded, and positive (upright) in Lead II