BSC physiology Flashcards
what are the characteristics of 1st degree AV block
long PR interval
PR interval greater than .2 seconds
sinus bradycardia
less than 60
what is the normal PR interval
.12-.2
atrial flutter
multiple p waves before every QRS and looks fairly regular
abnormal conduction
R-R interval is constant from beat to beat
atrial fibrillation
no distinct p waves
saw tooth
reentry is setting up this pathway (ectopic focus taking over normal SA rate of depolarization)
irregularly irregular
2:1 AV block Mobitz II
conduction system block
PR interval of conducted beats is normal
every other P wave is conducted
2:1 secondary AV block Mobitz I
longer PR interval with each cycle to the next until the AV node fails completely
slower rate
AV block meaning you drop a QRS because it doesn’t get to the ventricle
Wenckebach
third degree AV block
no pattern, no association
complete block
AV dissociation
regularly paced P waves
irregularly spaced QRS and T waves
completely variable PR interval
multiformed PVC’s
QRS complexes are irregular and not the same (the ones that are PVC’s)
PVC’s not preceded by p waves that don’t look the same so they are coming from different ectopic areas that are acting out
QRS duration is longer, ectopic foci are spreading depolarization cell to cell (via gap junctions and this is taking longer)
unifocal PVC
unusual QRS’s in the middle of everything
ectopic focus, originating in the ventricles
premature
No p wave precedes PVC QRS
QRS greater than .12 sec b/c cell to cell spread and not following the normal conduction system which takes longer
same shape PVC indicates one ectopic focus
torsades de pointes
different amplitudes of QRS’s
type of ventricular tachycardia
ventricular tachycardia
faster rate than normal originating in the ventricles
only seeing QRS’s
cell to cell spread b/c of wide QRSs
the QRS’s appear the same
more organized, probably have time for filling
ventricular fibrillation
abnormal conduction
no discernable P-waves
no discernable QRS complexes
bag of worms
not good!! NO FILLING DEAD
what does an AED do
resets putting everything into refractory
know***
tachy brady atrial flutter afib uniformed multiformed pvcs ventricular tachy v-fib one more