Page 1 of 15
Basic Dysrhythmias Exam Questions with Correct
Answers; Latest 2025
SA node .....ANSWER.....the major pacemaker of the heart
60-100 .....ANSWER.....inherent rate of the SA node
40-60 .....ANSWER.....inherent rate of the AV node
20-40 .....ANSWER.....inherent rate of the ventricles (purkinjie
fibers)
systole .....ANSWER.....phase of contraction
diastole .....ANSWER.....phase of relaxation
p wave .....ANSWER.....what does atrial depolarization show on
the ECG?
QRS complex .....ANSWER.....what does ventricle depolarization
show on the ECG?
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absolute refractory period .....ANSWER.....the period
immediately following the firing of a nerve fiber when it cannot
be stimulated no matter how great a stimulus is applied
relative refractory period .....ANSWER.....during the ventricular
cardiac cycle when all cardiac cells are not fully repolarized and
a strong enough stimulus can excite cardiac tissue and initiate
arrhythmias
0.12-0.20 .....ANSWER.....normal range of PR interval
0.04-0.12 .....ANSWER.....normal range of QRS complex
IV, O2 .....ANSWER.....tx for sinus bradycardia
sinus tachycardia .....ANSWER.....
treat underlying cause (Fever, pain, hypoxia) .....ANSWER.....tx
for sinus tachycardia
Basic Dysrhythmias Exam Questions with Correct
Answers; Latest 2025
SA node .....ANSWER.....the major pacemaker of the heart
60-100 .....ANSWER.....inherent rate of the SA node
40-60 .....ANSWER.....inherent rate of the AV node
20-40 .....ANSWER.....inherent rate of the ventricles (purkinjie
fibers)
systole .....ANSWER.....phase of contraction
diastole .....ANSWER.....phase of relaxation
p wave .....ANSWER.....what does atrial depolarization show on
the ECG?
QRS complex .....ANSWER.....what does ventricle depolarization
show on the ECG?
, Page 2 of 15
absolute refractory period .....ANSWER.....the period
immediately following the firing of a nerve fiber when it cannot
be stimulated no matter how great a stimulus is applied
relative refractory period .....ANSWER.....during the ventricular
cardiac cycle when all cardiac cells are not fully repolarized and
a strong enough stimulus can excite cardiac tissue and initiate
arrhythmias
0.12-0.20 .....ANSWER.....normal range of PR interval
0.04-0.12 .....ANSWER.....normal range of QRS complex
IV, O2 .....ANSWER.....tx for sinus bradycardia
sinus tachycardia .....ANSWER.....
treat underlying cause (Fever, pain, hypoxia) .....ANSWER.....tx
for sinus tachycardia
