# Week 3 Flashcards Preview

## [ECG] > Week 3 > Flashcards

Flashcards in Week 3 Deck (18)
1
Q

What is Step 1

A

Determine rhythm

2
Q

What can rhythm be?

A
1. regular (R-R intervals within 0.04 seconds)
2. regularly irregular (a pattern exists)
3. irregularly irregular (no pattern, chaotic)
3
Q

How do you determine rhythm?

A

Use piece of paper with lines

4
Q

What should be considered if rhythm is regularly irregular?

A

Respiratory Sinus Arrythmia

5
Q

Explain Respiratory Sinus Arrythmia

A

Changes in venous return and vagal tone: during inspiratory venous return increases causing vagal tone to decrease (increases HR). During expiration a reduction in venous return increases vagal tone (reduces HR).

6
Q

By how much does RSA change P-P interval

A

10%

7
Q

Step 2

A

Determine the rate

8
Q

How many large squares are in 1 minute?

A

300

9
Q

What speed does the ECG paper move at?

A

25 mm/s

10
Q

How do you calculate HR in a regular rhythm?

A

300/no. of large squares in R-R interval

11
Q

How do you calculate HR in a irregular rhythm?

A

count no. of QRS complex in 30 large squares then x 10

12
Q

Step 3

A

Evaluate the P wave

1. Are P-waves present?
2. Do they all have normal configurations?
3. Are they all similar shape and size?
4. Is there one P-wave for every QRS?
13
Q

Step 4

A

Determine duration of PR interval

1. is it between 0.12 - 0.2 seconds
2. is the PR interval constant?
14
Q

Step 5

A

Determine height and duration of QRS?

1. is the duration normal? 0.05 - 0.1 seconds
2. does a QRS complex appear after every P wave
3. Are all QRS complexes the same size and shape?
4. Are the QRS R/S waves too deep/high? 25 mm individually or 35 mm combined?
15
Q

Step 6

A

Is ST segment isoelectric

• 1.0 mm elevation
• 0.5 mm depression

at 80 ms past j-point (2 squares)
Is the ST segement upsloping/downsloping or horizontal?

16
Q

Step 7

A

Evaluation the T wave

1. Are T waves present
2. Do they have a normal shape
3. Do the have a normal amplitude (10mm precordial leads)
4. Do they all have the same amplitude?
5. Do the T waves have the same deflection as QRS complex?
17
Q

Step 8

A

Determine the QT interval

1. 0.35 - 0.44 seconds corrected
18
Q

Step 9

A

Evaluate any other components

1. origin of rhythm (SA node/AV node/ventricles)