041315 syncope part 2 Flashcards
1
Q
normal QRS width
A
under 120 ms
2
Q
normal PR interval
A
under 200 ms
3
Q
what can prolong QT interval in terms of ion conductance
A
increased Na
increased Ca
decreased K
4
Q
how does prolonged QT allow for Torsades to happen
A
if AP is prolonged, allows Ca ch to get reactivated
5
Q
mechanisms of prolonged QT
A
inherited or acquired (drugs)
6
Q
what drugs can prolong QT
A
class IA (Na ch blockers)-quinidine, procainamide class III (K ch blockers)-amiodraone, sotalol, dofetilide
antidepressants
antipsychotics
antibiotics/antifungals
note: amiodarone prolongs QT, but is rarely associated w Torsades
7
Q
3rd deg block
A
QRS beats regularly (no skipped beats)
8
Q
3rd deg block is commonly associ w
A
MI
9
Q
delta wave
A
Wolf Parkinson white
10
Q
no P waves
A
a fib
