21. DSA Abnormal ECG

Question 1

What are the characteristics of a premature atrial beat?

Answer 1

**RR interval is shorter than rest.

Everything else is usually normal

Question 2

What are the characteristics of a premature ventricular beat? (4)

Answer 2

RR interval is shorter
No P wave (cause beat started in ventricle)
QRS is prolonged and oddly shaped
T wave abnormal
Pause after PVC

Question 3

What are characteristics of atrial fibrillation? (4)

Answer 3

P waves absent
QRS/T normal
Noisy baseline
QRS complexes are irregularly irregular

Question 4

What can be seen during an SA nodal block?

Answer 4

there will be a flat line. No action potential at all

usually intermitent, so will only see skipped beats and flat lines

Question 5

In a first degree AV nodal block, what can be seen in an ECG?

Answer 5

There will be a lengthened PR interval. 0.32s abnormal, normal is between .12- .20s

Question 6

In a second degree AV nodal block, what is the hallmark?

Answer 6

Not every P wave is followed by a QRS complex

Question 7

Second degree AV blcok mobitz type I. What happens?

Answer 7

PR interval lengthens until a QRS complex doesnt happen. Cycle resumes after

Question 8

What occurs during a second degree AV block mobits type II?

Answer 8

COnsistently prolonged PR interval in beats with QRS, however QRS more commonly dropped QRS point

Question 9

In a third degree or complete AV nodal block, what occurs?

Answer 9

P waves normal from SA node
QRS may/may not be normal
NO relationship between p and qrs
P same distance apart and same with QRS just different interval