Dysrhythmias Flashcards
what does the pr interval tell you
how long it take to get from SA node to AV node
why do we read EKG every hours
baseline - trends
normal HR
60-100
what is the risk with AFib
clots
what does automaticity mean
don’t need a stimulant to beat - just goes
what does contractility mean
ability of heart to contract
what does excitability mean
ability of cells to respond to an electrical impulse
what does conductivity mean
signals heart muscle to contract
heart beat pathway
SA node signals atria to contract; signal stops at AV node
Pacemaker of the heart
SA node
which ventricle is bigger
left - blood is pushed through the whole body
the only artery that carries de-oxygenated blood
pulmonary artery carries blood to lungs to be oxygenated
the p-wave represents
atrial contraction
the p-r interval represents
pause at the AV node
the q-r-s represents
ventricular contractions
the st wave represents
ventricular re-polarization
the pr interval should measure (norm)
the qrs interval should measure (norm)
.08 -
the qt interval should measure (norm)
.40
a small EKG box measures
.04 sec
a lg EKG box measures
.20 sec
absolute refractory period
no outside source can stimulate ventricles to beat again
relative refractory period
could stimulate ventricles to beat again - causing funky rhythms - measure qt interval
if pt is having an acute MI
fireman’s hat - ST segment is elevated
