N618 Lecture 3 Questions with correct answers
what are the 3 pacemakers of the heart? Correct Answer--SA node
-AV node
-Purkinje fibers
which pacemaker is the primary pacemaker? intrinsic rate? Correct
Answer--SA node
-60 to 100
AV node Correct Answer--responsible for delaying impulses, not a
pacemaker itself
-40 to 60
purkinje fibers Correct Answer--20 to 40
why are there 3 pacemakers? Correct Answer--redundancy (if one goes
out, the other one steps in)
P wave Correct Answer--atrial depolarization
-best evaluated in lead II
normal rate for QRS complex Correct Answer--0.06 to 0.12 seconds
QRS complex Correct Answer--ventricular depolarization
, a wide QRS complex Correct Answer--bundle branch block
T wave Correct Answer--ventricular repolarization
if the T wave is peaked or tented, what does it mean? Correct Answer--
hyperkalemia
if the T wave is inverted? Correct Answer--ischemia
PR interval Correct Answer--time of atrial activation to the onset of
ventricular activation
a PR interval is prolong in Correct Answer--first degree AV block
normal rate for PR interval Correct Answer--0.12 to 0.20 seconds
QT interval Correct Answer--period of ventricular depolarization to
ventricular repolarization
normal rate for QT interval is Correct Answer--less than 0.44 seconds
a prolong QT interval is in Correct Answer--increase risk for torsades
what are the 3 pacemakers of the heart? Correct Answer--SA node
-AV node
-Purkinje fibers
which pacemaker is the primary pacemaker? intrinsic rate? Correct
Answer--SA node
-60 to 100
AV node Correct Answer--responsible for delaying impulses, not a
pacemaker itself
-40 to 60
purkinje fibers Correct Answer--20 to 40
why are there 3 pacemakers? Correct Answer--redundancy (if one goes
out, the other one steps in)
P wave Correct Answer--atrial depolarization
-best evaluated in lead II
normal rate for QRS complex Correct Answer--0.06 to 0.12 seconds
QRS complex Correct Answer--ventricular depolarization
, a wide QRS complex Correct Answer--bundle branch block
T wave Correct Answer--ventricular repolarization
if the T wave is peaked or tented, what does it mean? Correct Answer--
hyperkalemia
if the T wave is inverted? Correct Answer--ischemia
PR interval Correct Answer--time of atrial activation to the onset of
ventricular activation
a PR interval is prolong in Correct Answer--first degree AV block
normal rate for PR interval Correct Answer--0.12 to 0.20 seconds
QT interval Correct Answer--period of ventricular depolarization to
ventricular repolarization
normal rate for QT interval is Correct Answer--less than 0.44 seconds
a prolong QT interval is in Correct Answer--increase risk for torsades
