EKG Reading Quiz 1

Question 1

Indicators of Normal Lead II Tracing (and what they mean)

Answer 1

1. ) Frequency of QRS is about 1/sec (Normal HR)
2. ) Shape of QRS is normal for Lead II and duration is less than 100msec (Rapid repol of ventricles via normal conduction pathways)
3. ) Each QRS preceded by a P wave of proper configuration (SA nodal origin of excitation)
4. ) PR interval is less than 200 msec (proper conduction delay of the impulse propagation through the AV node)
5. ) QT interval is less than half of the R-to-R interval (Normal ventricular repol)
6. ) No extra P waves (No AV nodal conduction block is present)

Question 2

Widening of QRS

Answer 2

Bundle Branch Block

Question 3

QRS wide, large amplitude

Answer 3

PVC

Question 4

QRS wide, rapid rate

Answer 4

V Tac

Question 5

Cyclic changes in QRS amplitude, wide QRS

Answer 5

Torsades de pointes

Question 6

Nothing discernable

Answer 6

V Fib

Question 7

Normal but frequent. Sometimes P and T merge.

Answer 7

Paroxysmal supraventricular tachycardia (PSVT) aka supraventricular tachycardia

Question 8

Normal but long PR

Answer 8

First degree heart block

Question 9

Some independent P waves

Answer 9

Second degree heart block

Question 10

P, QRS not in sync

Answer 10

Third degree heart block

Question 11

N P, QRS irregualr

Answer 11

A Fib