ECG pathologies

Question 1

block in AV conduction

Answer 1

PR interval longer than normal

Question 2

atrial hypertrophy

Answer 2

PR interval longer than normal

Question 3

secondary pacemaker activity

Answer 3

PR interval shorter than normal

Question 4

PR interval shorter than normal

Answer 4

secondary pacemaker activity (not because conduction time through AV node is faster than normal)

Question 5

few large and wide QRS complexes appearing in a lead with most QRS normal

Answer 5

premature ventricular contractions

Question 6

all very large and wide QRS complexes

Answer 6

RBBB or LBBB

hyperkalemia –> ventricle producing its own beat