DPT 712: EXAM 2 CARDIAC ELECTROPHYSIOLOGY EXAM QUESTIONS ANSWERED CORRECTLY GRADED A++
sequence of excitation
SA node, AV node, AV bundle, bundle branches, purkinje fibers
SA node referred to as
pacemaker; generates the impulse
SA node location
in R atrial wall, near opening of SVC
SA node...
SA node, AV node, AV bundle, bundle branches, purkinje fibers
SA node referred to as
pacemaker; generates the impulse
SA node location
in R atrial wall, near opening of SVC
SA node AP
generates AP 75x/min; normal sinus rythm
vagal tone
vagus nerve continuously slows down the SA node
AV node function
delays the impulse about .1 seconds to allow completion of ventricular contractoin
AV bundle/bundle of HIS location
in superior interventricular septum
AV bundle is the only
electrical connection btwn atria and ventricles
R and L bundle branches
2 pathways in the inter ventricular septum that carry impulses towards the apex of the
heart
, purkinje fibers aka
subendocardial conducting network
purkinje fiber function
complete the pathway through inter ventricular septum into apex and ventricular walls
electrocardiogrphy
composite all electrical activity generated in the heart
waves of ECG/EKG
p wave, QRS complex, T wave
p wave
depolarization of atria
QRS complex
ventricular depolarization and atrial repolarization
T wave
ventricular repolarization
Q=
excitation of IV septum
R=
excitation of apex and free walls
S=
excitation of myocardium near base
PR segment
the delay in the AV node; important for diagnosing heart blocks
ST segment
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