Dysrhythmias/ECG Interpretation Flashcards Preview

NUR 102- Test 4 > Dysrhythmias/ECG Interpretation > Flashcards

Flashcards in Dysrhythmias/ECG Interpretation Deck (14):
1

Dysrhythmias/ECG Interpretation

What do the P, Q, R S, T waves represent on an ECG?

They represent the cardiac cycle.

2

Dysrhythmias/ECG Interpretation

What does the P wave show on an ECG?

It shows the SA node impulse and atrial depolarization (when action potential (an electrical pulse) causes the cell membrane to become more positive).

REMEMBER: The action potential (electrical impulse) and depolarization cause the muscle to contract

3

Dysrhythmias/ECG Interpretation

What does the PR interval represent on an ECG. How is it measured? How long is the PR interval?

It is the time required for the impulse to travel to the AV node and the bundle branches. It is measure from the beginning to the P wave to the beginning of the QRS complex. It is normally 0.12 to 0.20 second.

4

Dysrhythmias/ECG Interpretation

What does the QRS complex indicate on an ECG? How long does it last?

It indicates ventricular depolarization (the action potential (electrical impulse) causes the cell membrane to become more positive). It lasts from 0.06-0.10 second.

REMEMBER: The action potential (electrical impulse) and depolarization cause the muscle to contract

5

Dysrhythmias/ECG Interpretation

What does the T wave represent on an ECG? Describe its characteristics.

It represents ventricular repolarization (returning the cell to its resting state). It is smooth and rounded, and points in the same direction as the QRS complex.

6

Dysrhythmias/ECG Interpretation

What does the QT interval indicate on an ECG? How is it measure. How long does it last?

It indicates the total time for ventricular depolarization and repolarization. It is measure from the beginning of the QRS to the end of the T wave. Its durations varies with gender, age, and heart rate; usually it is 0.32-0.44 second long.

7

Dysrhythmias/ECG Interpretation

What are ectopic beats

Impulses that may develop more rapidly or more slowly than normal or may originate outside the SA node.

8

Dysrhythmias/ECG Interpretation

What is a heart block?

A blocked impulse or delayed as it moves through the conduction pathways of the heart.

9

Dysrhythmias/ECG Interpretation

Rhythm appears on an ECG shows:
Regular; rate 60-100 bpm. P wave preceding every QRS complex PR interval = 0.12-0.2 second, QRS complex = 0.06-0.10 second, T-wave is smooth and in the same direction as the QRS complex, and the QT interval = 0.32-0.44. This is referred to as:

Normal sinus rhythm

10

Dysrhythmias/ECG Interpretation

Rhythm appears on an ECG shows:
Regular; rate greater than 100 bpm. P wave preceding every QRS complex PR interval = 0.12-0.2 second, QRS complex = 0.06-0.10 second, T-wave is smooth and in the same direction as the QRS complex, and the QT interval = 0.32-0.44. This is referred to as:

Sinus tachycardia

11

Dysrhythmias/ECG Interpretation

Rhythm appears on an ECG shows:
Regular; rate less than 60 bpm. P wave preceding every QRS complex PR interval = 0.12-0.2 second, QRS complex = 0.06-0.10 second, T-wave is smooth and in the same direction as the QRS complex, and the QT interval = 0.32-0.44. This is referred to as:

Sinus bradycardia

12

Dysrhythmias/ECG Interpretation

Rhythm appears on an ECG shows:

Irregular, an ectopic atrial beat occurring earlier than expected.

Premature atrial contractions (PACs)

Remember:
Ectopic is a beat occurring before the SA node (in the atrium)

13

Dysrhythmias/ECG Interpretation

Rhythm appears on an ECG shows:

Regular with sawtooth appearance of P waves. Atrial rate is 240+ bpm; ventricular rate less than 150 bpm. This is referred to as:

Atrial flutter

14

Dysrhythmias/ECG Interpretation

Rhythm appears on an ECG shows:

Irregularly irregular; with no identifiable P waves; and variable ventricular rate. This is referred to as

Atrial fibrillation or A-Fib

Remember:
The P wave represents atrial contraction. When the P wave is not present then it is a fibrillation of the atrium.