Critical Care exam 2 Cardiac UPDATED
ACTUAL Exam Questions and CORRECT
Answers
SA node - CORRECT ANSWER pace maker of 60-100
AV node - CORRECT ANSWER delays impulse to ventricles and allows for filling (40-
60 beats)
Ventricles (purkinje fibers) - CORRECT ANSWER 20-40 beats
dysrhythmias - CORRECT ANSWER disruption in cardiac conduction pathway which
causes decrease in cardiac output
S&S of cardiac dysrhythmias - CORRECT ANSWER SOB, palpitations, NV,
lightheadedness, syncope, chest pain— all due to decreased CO
Big box - CORRECT ANSWER 0.2 sec
Little box - CORRECT ANSWER 0.04 sec
P wave - CORRECT ANSWER atrial depolarization
P wave should not be longer than - CORRECT ANSWER 0.10 sec and no higher than 3
boxes (2.5 mm)
QRS complex - CORRECT ANSWER ventricular depolarization
, QRS interval - CORRECT ANSWER measure of time to depolarize the ventricles
QRS interval time - CORRECT ANSWER 0.06 to 0.10 sec (1.5-2.5 small boxes in length
Wide QRS means - CORRECT ANSWER slowed conduction due to MI, or
cardiomyopathy
T wave - CORRECT ANSWER ventricular repolarization
T waves should be no greater than - CORRECT ANSWER five small boxes high
T wave inversion indicates - CORRECT ANSWER ischemia to myocardium or electrolyte
imbalance
Tall T waves can be due to - CORRECT ANSWER hyperkalemia
U wave - CORRECT ANSWER purkinje fiber repolarization (rarely seen)
Stemi indicates - CORRECT ANSWER complete blockage. MI
Sinus Brady - CORRECT ANSWER sinus rhythm but heart rate less than 60
Treatment for sinus brady - CORRECT ANSWER atropine (o.5mg IV push), vagal
maneuver, pace maker for severe symptomatic pts
Atrial pacing - CORRECT ANSWER spike appears before the p wave
Ventricular pacing - CORRECT ANSWER spike appears before the QRS complex
ACTUAL Exam Questions and CORRECT
Answers
SA node - CORRECT ANSWER pace maker of 60-100
AV node - CORRECT ANSWER delays impulse to ventricles and allows for filling (40-
60 beats)
Ventricles (purkinje fibers) - CORRECT ANSWER 20-40 beats
dysrhythmias - CORRECT ANSWER disruption in cardiac conduction pathway which
causes decrease in cardiac output
S&S of cardiac dysrhythmias - CORRECT ANSWER SOB, palpitations, NV,
lightheadedness, syncope, chest pain— all due to decreased CO
Big box - CORRECT ANSWER 0.2 sec
Little box - CORRECT ANSWER 0.04 sec
P wave - CORRECT ANSWER atrial depolarization
P wave should not be longer than - CORRECT ANSWER 0.10 sec and no higher than 3
boxes (2.5 mm)
QRS complex - CORRECT ANSWER ventricular depolarization
, QRS interval - CORRECT ANSWER measure of time to depolarize the ventricles
QRS interval time - CORRECT ANSWER 0.06 to 0.10 sec (1.5-2.5 small boxes in length
Wide QRS means - CORRECT ANSWER slowed conduction due to MI, or
cardiomyopathy
T wave - CORRECT ANSWER ventricular repolarization
T waves should be no greater than - CORRECT ANSWER five small boxes high
T wave inversion indicates - CORRECT ANSWER ischemia to myocardium or electrolyte
imbalance
Tall T waves can be due to - CORRECT ANSWER hyperkalemia
U wave - CORRECT ANSWER purkinje fiber repolarization (rarely seen)
Stemi indicates - CORRECT ANSWER complete blockage. MI
Sinus Brady - CORRECT ANSWER sinus rhythm but heart rate less than 60
Treatment for sinus brady - CORRECT ANSWER atropine (o.5mg IV push), vagal
maneuver, pace maker for severe symptomatic pts
Atrial pacing - CORRECT ANSWER spike appears before the p wave
Ventricular pacing - CORRECT ANSWER spike appears before the QRS complex
