DPT 712: EXAM 2 CARDIAC ELECTROPHYSIOLOGY EXAM QUESTIONS ANSWERED CORRECTLY GRADED A++

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 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