EKG Lab Flashcards
diagnostic tool to evaluate the heart and measures electrical activity
EKG
the pacemaker of the heart
SA node
Sequence of electrical activity of heart
SA node in right atrium, left atrium, AV node, Bundle of His, bundle branches, Purkinje fibers, spreads over ventricle surface
be able to label an EKG graph
okay… in notes
normal PR range in seconds
.12 - .2
normal QRS range
<.1
normal QT range
<.4
P is the
depolarization of atria
QRS is the
depolarization of the ventricle
T is the
repolarization of the ventricle
if PR is prolonged it means a problem with blank and is called a blank
conduction through AV node, first degree heart block
if QRS is prolonged it means blank and is usually due to blank
slower speed of stimulus through ventricles, block in bundle branches
if QT is prolonged it can be due to these two things
drugs, low Ca or K ions, hypothermia, myocardia/ischemia
prolonged QT tends to predispose patient to blank
ventricular arrhythmias
shortened QT can be due to these two things
drugs, high serum Calcium ions
this is when ventricular systole is skipped
2nd degree heart block
You see blank with no blank in a 2nd degree heart block
P, QRS
this is when there is no conduction through the AV node
3rd degree heart block
3rd degree heart block is when blank waves do not agree with blank
P, QRS
this is when there are premature beats arising in ventricles
premature ventricular contraction
premature ventricular contraction occurs when the ventricles are not blank
stimulated simultaneously
asynchronous contraction of the heart
fibrillation
atrial fibrillation shows a blank pattern in place of blank waves on an EKG and is blank life threatening
irregular wavy, P, not
ventricular fibrillation shows no blank but shows blank on an EKG and is blank life threatening
cardiac output, irregular waves, very
the first heart is due to the closing of blank and occurs during blank on the EKG
AV valves, qrs
the second heart is due to the closing of blank and occurs blank on the EKG
semilunar valves, after T
heart rate and pulse speed should blank during inspiration
increase
heart rate and pulse speed should blank during expiration
decrease
during the valsalva maneuver venous return initially blank which causes the baroreflex to blank heart rate. then the amount of blood flow blank because of the maneuver which causes a blank in heart rate due to the baroreflex
increases, decrease, decreases, increase
re breathing air from a plastic bag increases the amount of blank which causes the baroreflex to blank heart rate
CO2, increase
the higher the ventricular blank, the higher the blank
volume, pressure
these two waves could overlap if someone exercises hard enough in an ECG
p and t
the angle of the heart increases during blank and decreases during blank
inspiration, expiration
normal angle of the heart
60 degrees
