# DSA Basic ECG - Dr. Johnston Flashcards

1
Q

1 small square is what

A

0.04sec and 1mm = 0.1mV
BECOMING
0.2sec, 5mm, 0.5mV ——> one big square

2
Q

P wave should look like what and is

A

Round

Atrial depolarization

3
Q

PR segment is what and should be long

A
```Atrial repolarization (conduction time from atrium to AV node) = LONG is AV block
0.2sec or less```
4
Q

QRS interval should be how long and is what

A

Less then 0.12sec or less (about 3 small squares)
Up= medial ventricular depolarization going down
Down = lateral ventricular depolarization going up

5
Q

ST location and what is it

A

At the level of baseline PR segment (can be elevated)

Ventricular depolarization or pause in it

6
Q

T wave is what

A

Ventricular repolarization

7
Q

U wave is prominent in what patients

A

Hypokalemia

8
Q

Normal axis

A

0-90 degrees

9
Q

A

AV conduction disturbance

Like and AV block

10
Q

Wider QRS (more then .12sec)

A

Conduction disturbance = bundle branch block
OR
Hypertrophy of the chamber

11
Q

Inverted T wave in leads it should not be is what

A

MI

12
Q

Number of small boxes in between 2 large ones

A

5 small boxes

13
Q

Counting HR what is the numbers you count on each dark line you pass

A

300, 150, 100, 75, 60, 5,43,37, 33
OR
Found number of dark lines between 2 peaks and divide 300 by it

14
Q

Normal axis
Left axis
Right axis
Extreme right axis

A
• 1 and + AVF
1. +1 and - AVF
2. -1 and + AVF
3. -1 and - AVF
15
Q

Picture rate Rhythm axis

A

98bpm
Sinus (you see 1 P wave before QRS)
Left axis (then look for smallest one = AVR, perpendicular to it is lead3 which looks mostly -, then its - 60 degrees)