Flashcards in The normal ECG Deck (21):

1

## Definition of the Q wave

### The first deflection of the QRS complex if it is downward

2

## Definition of R wave

### The first upward deflection

3

## Definition of R-prime (R')

### The second upward deflection (if present)

4

## Definiton of S wave

### First downward deflection following an upward deflection

5

## Definition of QS wave

### If the entire QRS is one downward deflection

6

##
In which Leads is Q wave normal?

What is the normal amplitude of the Q wave?

###
Lateral leads (AvL, I, V5, V6) - represents septal depolarization

Normal amplitude should be max 0.1 mV

7

## What is the difference between segments and intervals?

### Interval = wave + segment

8

## Which leads are the inferior leads?

### Lead II, III, AvF (60, 120, 90 degrees)

9

## Which leads are the lateral leads?

### Lead I, AvL(0, -30), V5, V6

10

## Which lead is the right sided?

### AvR (-150) V1

11

## Which leads are anterior?

### V2, V3, V4

12

## What is the normal duration of the PR interval?

### 0.12 - 0.2 s

13

## What is R wave progression?

###
Progressivly increasing R amplitude from V1 to V5

(V6 is normally a little smaller than V5)

14

## How long is the normal QRS interval?

### 0.06s - 0.1 s

15

## In which leads should the T wave be positive?

### It is typically positive in leads with a tall R wave

16

## What is the typical length of the QT interval?

###
It normally composes 40% of the cardiac cycle.

17

## What is the normal QRS amplitude?

###
10mV in chest leads

5mV in limb leads

18

## How can you see if the rhytm is from the sinus node?

### positive QRS in leads I and II, negative in AvR

19

## What is the normal heart axis?

### 90 to -30 degrees (pos QRS in lead I, II)

20

## What is the normal duration and amplitude of the P wave?

### less than 0.12s and max 2,5mm

21