Interpretation

Question 1

How to work out ventricular rate on ECG

Answer 1

Number of QRS in rhythm strip x 6

OR

300 divided by the number of large squares between QRS complexes

Question 2

What defines narrow and broad complex tachycardias

Answer 2

Narrow= <3 small squares= 0.12 seconds (120 milliseconds)

Broad= >3 small squares

Question 3

How do we confirm left axis deviation

Answer 3

If Lead I is positive and Lead II is negative then IT MUST BE LAD

Question 4

How to confirm RAD on ECG

Answer 4

Lead I negative and AvF positive it MUST BE RAD

Question 5

What is a normal PR interval

Answer 5

3-5 small squares = 120-200 milliseconds

Question 6

What time do small and large squares on ECG represent

Answer 6

Small= 0.04 seconds= 40 milliseconds

Large= 0.2 seconds= 200 milliseconds

Question 7

Mobitz type 1 and type 2

Answer 7

Both types of 2nd degree heart block

Type 1= progressively elongating PR complexes until dropped QRS

Type 2= fixed long PR interval with drops

Mobitz type 2 is worse

Question 8

what is a long QT interval

Answer 8

In males >440
In females >460
>500 associated with torsades de pointes

Just look at QTc at the top