Heart Function and Cardiac Cycle Flashcards
What is Einthoven’s Triangle?
lead placements on the right and left arms and the left leg for EKG
what is the most common lead to view on an EKG?
lead 2
voltage changes in the direction of the _______ lead is registered as an upward deflection
positive
this type of EKG is arranged to analyze information in a circular fashion (cross section) and provides better resolution
12 lead EKG
slow HR
bradycardia <60bpm
fast HR
tachycardia >100bpm
this occurs when there is no coordinated synchronized rhythm of the heart
fibrilation
this is a stray signal that tells the chamber to contract early
premature beats (PAC and PVC)
S-T elevation indicates this condition
myocardial infarction
S-T depression may indicate _______
ischemia
this occurs when the electrical signals from the atria to the ventricles is disrupted
heart block
what is indicative of a 1st degree heart block?
widened PR interval (>0.2)
what is indicative of a type 1 second degree heart block?
PR interval becomes wider and wider until it drops QRS
what is indicative of a type 2 second degree heart block?
intermittent dropping of the QRS without progressive widening of PR interval
what is indicative of a 3rd degree heart block?
independent P and QRS (completely uncoordinated)
this is filling/ the relaxation phase
diastole