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APEX EKG TEST
2026|COMPREHENSIVE Q&A FOR
CERTIFICATION SUCCESS 2026
Atrial Flutter - correct-answer - Regularity: atrial usually regular, ventricular rate
may be irregular depending on the conduction rate thru the AV node
Rate:
Atrial rate: 250 to 350 beats per minute
Ventricular rate: usually 60 to 150 beats per minute depending on the conduction
thru the AV node
P wave: abnormal, sawtoothed appearance known as "flutter waves", also
described as "picket fence shaped or V-shaped"
PRI : indiscernible, because there are no true P waves
QRS: 0.06 to 0.10 seconds
QTI: indiscernible
T wave: indiscernible
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Atrial Tachycardia - correct-answer - Regularity: R-R intervals are regular, overall
rhythm is regular
Rate: Atrial and ventricular rates are the same. The rate is usually between 160-
250 beats/min
P wave: There is one p wave in front of every QRS. The P waves may appear
different than a sinus P wave due to the rapid rate. They can be notched or
flattened, and in some cases the P wave may be lost within the QRS complex
PRI : 0.12 to 0.20 seconds, PRI is consistent, but may not be easily measured due
to the rate
QRS: 0.06 to 0.10 seconds and all are uniform
QTI: usually indiscernible
T wave: usually indiscernible
Supraventricular Tachycardia (SVT) - correct-answer - Regularity: atrial and
ventricular rate regular
Rate: greater than 160 beats per minute, (can be 200 beats per minute or more)
P wave: abnormal, small and upright, may be hidden in QRS if rate is very fast
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PRI : less than 0.12 seconds, if present
QRS: typically less than 0.06 - 0.08 seconds, very narrow
QTI: indiscernible
T wave: indiscernible
Paroxysmal Supraventricular Tachycardia (PSVT) - correct-answer - Paroxysmal
refers to a rhythm that starts and stops suddenly
Premature Junctional Contractions - correct-answer - Regularity: underlying rate
is regular except for early beat
Rate: determined by the underlying rhythm
P wave: upright, smooth, round and uniform shape, EXCEPT for the early beat, it
will be inverted before or after the QRS or missing
PRI : 0.12 to 0.20 seconds normal in the underlying rhythm, <0.12 seconds in the
early if it precedes the QRS
QRS: 0.06 to 0.10 seconds and all are uniform
QTI: 0.36 to 0.46 seconds
APEX EKG TEST
2026|COMPREHENSIVE Q&A FOR
CERTIFICATION SUCCESS 2026
Atrial Flutter - correct-answer - Regularity: atrial usually regular, ventricular rate
may be irregular depending on the conduction rate thru the AV node
Rate:
Atrial rate: 250 to 350 beats per minute
Ventricular rate: usually 60 to 150 beats per minute depending on the conduction
thru the AV node
P wave: abnormal, sawtoothed appearance known as "flutter waves", also
described as "picket fence shaped or V-shaped"
PRI : indiscernible, because there are no true P waves
QRS: 0.06 to 0.10 seconds
QTI: indiscernible
T wave: indiscernible
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Atrial Tachycardia - correct-answer - Regularity: R-R intervals are regular, overall
rhythm is regular
Rate: Atrial and ventricular rates are the same. The rate is usually between 160-
250 beats/min
P wave: There is one p wave in front of every QRS. The P waves may appear
different than a sinus P wave due to the rapid rate. They can be notched or
flattened, and in some cases the P wave may be lost within the QRS complex
PRI : 0.12 to 0.20 seconds, PRI is consistent, but may not be easily measured due
to the rate
QRS: 0.06 to 0.10 seconds and all are uniform
QTI: usually indiscernible
T wave: usually indiscernible
Supraventricular Tachycardia (SVT) - correct-answer - Regularity: atrial and
ventricular rate regular
Rate: greater than 160 beats per minute, (can be 200 beats per minute or more)
P wave: abnormal, small and upright, may be hidden in QRS if rate is very fast
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PRI : less than 0.12 seconds, if present
QRS: typically less than 0.06 - 0.08 seconds, very narrow
QTI: indiscernible
T wave: indiscernible
Paroxysmal Supraventricular Tachycardia (PSVT) - correct-answer - Paroxysmal
refers to a rhythm that starts and stops suddenly
Premature Junctional Contractions - correct-answer - Regularity: underlying rate
is regular except for early beat
Rate: determined by the underlying rhythm
P wave: upright, smooth, round and uniform shape, EXCEPT for the early beat, it
will be inverted before or after the QRS or missing
PRI : 0.12 to 0.20 seconds normal in the underlying rhythm, <0.12 seconds in the
early if it precedes the QRS
QRS: 0.06 to 0.10 seconds and all are uniform
QTI: 0.36 to 0.46 seconds
