EKG EXAM ARRHYTHMIAS WITH CORRECT
ANSWERS 2025
1. Regular Rhythm:
Sinus Regular Rate:
rhythm 60-100 bpm
P-wave: upright, rounded, one before each
QRS complex PRI: 0.12-0.20 seconds (3-5
small boxes)
QRS: 0.08-0.12 seconds (2-3 small boxes)
2. Sinus Impulse originates from the
Bradycar- dia SA node Rhythm: regular
Rate: less than
60 bpm P-wave:
normal
PRI: 0.12-0.20 s
QRS: 0.08-0.12 s
3. Sinus tachycardia Impulse originates in the
SA node
Rhythm: regular
Rate: greater than
100 bpm P-wave:
normal
PRI:
normal
QRS:
4. Respiratory Impulse originates from the SA node. Normal physiological
normal
sinus phenomenon in young adults and children that causes changes
arrhythmia in vagal tone during respiration.
Rhythm: irregular
Rate: may be normal
or slow P-wave:
normal
PRI: 1
/
normal
QRS:
normal
, EKG EXAM ARRHYTHMIAS WITH CORRECT
ANSWERS 2025
5. Sinus Failure of the SA node to initiate an impulse. ECG tracing will
pause/ar- rest show a sudden pause in the sinus rhythm in which one or more
beats are missing. The underlying rhythm does not resume on
time following the pause.
6. Sinoatrial Rhythm caused by a block in the conduction of the electrical
exit block impulse from the SA node to the atria. ECG strip will show a
sudden pause in the sinus rhythm in which one or more beats
are missing. Underlying rhythm resumes on time following a
pause.
7. sick sinus AKA tachy-Brady syndrome. Sinus node dysfunction. Severe
syn- drome sinus bradycardia alternating with tachycardia. Often a-fib.
Lethargy, weakness, light-headedness, dizziness, syncope
8. Wolff- Short PR interval of less than 0.12 seconds. Prolongation of
Parkin- son- the QRS interval greater than 0.12 seconds. Delta wave-
White slurred upstroke of the QRS complex, this is a hallmark!!! Pts
with WPW have episodes or paroxysmal tachy-arrhythmias.
Palpitations, dizziness, syncope, chest pain. Left-sided accessory
pathway (AKA Bundle of Kent) causes pre-excitation and left to
right activation thus allowing impulses to bypass the AV node
and travel through the myocardium from left to right.
9. Premature Rhythm: underlying rhythm is regular,
atrial irregular with PAC Rate: that of the
contraction underlying rhythm
P-wave: P-wave associated with the PAC is premature and
abnormal is size, shape
2
/
and direction; often found hiding in
preceding T-wave, distorting the T-wave
ANSWERS 2025
1. Regular Rhythm:
Sinus Regular Rate:
rhythm 60-100 bpm
P-wave: upright, rounded, one before each
QRS complex PRI: 0.12-0.20 seconds (3-5
small boxes)
QRS: 0.08-0.12 seconds (2-3 small boxes)
2. Sinus Impulse originates from the
Bradycar- dia SA node Rhythm: regular
Rate: less than
60 bpm P-wave:
normal
PRI: 0.12-0.20 s
QRS: 0.08-0.12 s
3. Sinus tachycardia Impulse originates in the
SA node
Rhythm: regular
Rate: greater than
100 bpm P-wave:
normal
PRI:
normal
QRS:
4. Respiratory Impulse originates from the SA node. Normal physiological
normal
sinus phenomenon in young adults and children that causes changes
arrhythmia in vagal tone during respiration.
Rhythm: irregular
Rate: may be normal
or slow P-wave:
normal
PRI: 1
/
normal
QRS:
normal
, EKG EXAM ARRHYTHMIAS WITH CORRECT
ANSWERS 2025
5. Sinus Failure of the SA node to initiate an impulse. ECG tracing will
pause/ar- rest show a sudden pause in the sinus rhythm in which one or more
beats are missing. The underlying rhythm does not resume on
time following the pause.
6. Sinoatrial Rhythm caused by a block in the conduction of the electrical
exit block impulse from the SA node to the atria. ECG strip will show a
sudden pause in the sinus rhythm in which one or more beats
are missing. Underlying rhythm resumes on time following a
pause.
7. sick sinus AKA tachy-Brady syndrome. Sinus node dysfunction. Severe
syn- drome sinus bradycardia alternating with tachycardia. Often a-fib.
Lethargy, weakness, light-headedness, dizziness, syncope
8. Wolff- Short PR interval of less than 0.12 seconds. Prolongation of
Parkin- son- the QRS interval greater than 0.12 seconds. Delta wave-
White slurred upstroke of the QRS complex, this is a hallmark!!! Pts
with WPW have episodes or paroxysmal tachy-arrhythmias.
Palpitations, dizziness, syncope, chest pain. Left-sided accessory
pathway (AKA Bundle of Kent) causes pre-excitation and left to
right activation thus allowing impulses to bypass the AV node
and travel through the myocardium from left to right.
9. Premature Rhythm: underlying rhythm is regular,
atrial irregular with PAC Rate: that of the
contraction underlying rhythm
P-wave: P-wave associated with the PAC is premature and
abnormal is size, shape
2
/
and direction; often found hiding in
preceding T-wave, distorting the T-wave
