DSA Basic ECG - Dr. Johnston

Question 1

1 small square is what

Answer 1

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

Question 2

P wave should look like what and is

Answer 2

Round

Atrial depolarization

Question 3

PR segment is what and should be long

Answer 3

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

Question 4

QRS interval should be how long and is what

Answer 4

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

Question 5

ST location and what is it

Answer 5

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

Ventricular depolarization or pause in it

Question 6

T wave is what

Answer 6

Ventricular repolarization

Question 7

U wave is prominent in what patients

Answer 7

Hypokalemia

Question 8

Normal axis

Answer 8

0-90 degrees

Question 9

Long PR can be a sign in

Answer 9

AV conduction disturbance

Like and AV block

Question 10

Wider QRS (more then .12sec)

Answer 10

Conduction disturbance = bundle branch block
OR
Hypertrophy of the chamber

Question 11

Inverted T wave in leads it should not be is what

Answer 11

MI

Question 12

Number of small boxes in between 2 large ones

Answer 12

5 small boxes

Question 13

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

Answer 13

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

Question 14

Normal axis
Left axis
Right axis
Extreme right axis

Answer 14

1. • 1 and + AVF
2. +1 and - AVF
3. -1 and + AVF
4. -1 and - AVF

Question 15

Picture rate Rhythm axis

Answer 15

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)