ECG pathology review

Question 1

PR interval longer than normal (> .2 s)

Answer 1

block in AV conduction or atrial hypertrophy

Question 2

PR interval shorter than normal < 0.12 s)

Answer 2

secondary pacemaker activity (ex: junctional bradycardia)

NOT conduction time through AV node faster

Question 3

few lg. and wide QRS complexes in mostly normal lead

Answer 3

premature ventricular contractions

Question 4

all lg and wide QRS complexes

Answer 4

RBBB
LBBB
hyperkalemia

the ventricle is producing its own beat

Question 5

p wave occurs without subsequent QRS

Answer 5

premature atrial contraction or second degree AV block