Advanced Arrhythmias Flashcards
1
Q
What are some reasons for second degree heart block Mobitz I (Wenkebach) (6)?
A
- acute inferior MI
- digoxin
- beta blockers
- CCBs
- hyperkalemia
- high vagal tone
2
Q
Why may a second-degree heart block Mobitz II not look the way you’d expect it to?
A
At higher P-QRS ratios, P-waves might be hidden in the ST segment or T-wave
3
Q
What are some reasons for second degree heart block Mobitz II (4)?
A
- inferior MI
- anterior MI
- myocarditis
- aging process
4
Q
Why is second-degree heart block Mobitz II or complete heart block dangerous?
A
These heart blocks can suddenly lead to ventricular standstill.
5
Q
Out of IV dopamine, atropine, pacemaker, which would be helpful in treating second-degree heart block Mobitz II?
A
All but the atropine, which can actually worsen the conduction abnormality.
6
Q
What are some reasons for complete heart block (6)?
A
- digoxin toxicity
- acute rheumatic fever
- acute MI
- aging process
- genetic
- post-open heart surgery
7
Q
ECG features of Ashman’s phenomenon
A
- beat with wide QRS
- often found when in atrial fibrillation
- can resemble PVCs
- come after short R-R and before long R-R
- signal originates above AV node, not from a ventricle
