ECG

Question 1

ECG Normal Values

Answer 1

Rate: 60-100
PR interval 0.12 to 0.20 s (3 - 5 small squares)
QRS complex: < 0.12 s duration (3 small squares)
QTc range from: 350 to 440 ms for adult men and from 360 to 460 ms for adult women;

Question 2

AV Block: 2nd degree, Mobitz I (Wenckebach Phenomenon) Criteria

Answer 2

Progressive prolongation of the PR interval culminating in a non-conducted P wave

Question 3

AV Block: 2nd degree, Mobitz II (Hay block) criteria

Answer 3

Intermittent non-conducted P waves without progressive prolongation of the PR interval

Question 4

AV Block: 1st degree criteria

Answer 4

PR interval > 200ms (five small squares)

Question 5

AV Block: 3rd degree criteria

Answer 5

Severe bradycardia due to absence of AV conduction
The ECG demonstrates complete AV dissociation, with independent atrial and ventricular rates

Question 6

Signs of right sided involvement in inferior STEMI

Answer 6

Suggestive features include:
ST elevation in V1, the only lead that looks directly at the RV
ST elevation in III > II, as lead III is more rightward facing
V4R Elevation