3/13/25, 6:40 PM APEX EKG Test / Comprehensive Study Guide – Expert Strategies, Review of Key Quizzes, and Practice Questions for Guarantee…
APEX EKG Test / Comprehensive Study Guide –
Expert Strategies, Review of Key Quizzes, and
Practice Questions for Guaranteed Success /
Newest 2025/2026.
Save
Terms in this set (41)
Each small square (the smaller
lighter boxes within the big bold
boxes) represents 0.04 seconds
Each larger square (the boxes
EKG Grid within the bold lines) represents
0.2 seconds.
Each large square has 5 small
squares across SO 0.04 X 5 = 0.2
seconds
The 6 Second Strip Least accurate, but quickest way to estimate rate
Method especially in irregular rhythms
EKG
EKG intervals
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,3/13/25, 6:40 PM APEX EKG Test / Comprehensive Study Guide – Expert Strategies, Review of Key Quizzes, and Practice Questions for Guarantee…
P Wave Atrial depolarization
Normal is 0.12 to 0.20 seconds
PR Interval Corresponds to the delay the AV node provides to
allow for ventricular filling
Normal is <0.12 seconds usually between 0.06 to 0.10
QRS Complex seconds
Ventricular depolarization
QT Interval Normal 0.36-0.46
Determine Regularity
Calculate the Rate
6 Steps for Rhythm Evaluate the P wave
Interpretation Measure the PRI
Evaluate the QRS Width
Evaluate the T wave and Calculate the QTI
Regularity: atrial and ventricular rate are regular
Rate: 60 to 100 beats per minute
P wave: upright, smooth, round and uniform shape,
one for every QRS complex
Normal Sinus Rhythm
PRI : 0.12 to 0.20 seconds
QRS: 0.06 to 0.10 seconds
QTI: 0.36 to 0.46 seconds
T wave: upright, smooth and round uniform shape
Regularity: atrial and ventricular
rate are regular
Rate: < 60 beats per minute
P wave: upright, smooth, round
and uniform shape, one for
Sinus Bradycardia every QRS complex
PRI : 0.12 to 0.20 seconds
QRS: 0.06 to 0.10 seconds
QTI: 0.36 to 0.46 seconds
T wave: upright, smooth and
round uniform shape
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, 3/13/25, 6:40 PM APEX EKG Test / Comprehensive Study Guide – Expert Strategies, Review of Key Quizzes, and Practice Questions for Guarantee…
Regularity: atrial and ventricular
rate are regular
Rate: >100 beats per minute
P wave: upright, smooth, round
and uniform shape, one for
Sinus Tachycardia every QRS complex
PRI : 0.12 to 0.20 seconds
QRS: 0.06 to 0.10 seconds
QTI: 0.36 to 0.46 seconds
T wave: upright, smooth and
round uniform shape
Regularity: atrial and ventricular
rate are the same but the
rhythm will be slightly irregular
Rate: variable, can be
bradycardia to normal
P wave: upright, smooth, round
Sinus Arrhythmia and uniform shape, one for
every QRS complex
PRI : 0.12 to 0.20 seconds
QRS: 0.06 to 0.10 seconds
QTI: 0.36 to 0.46 seconds
T wave: upright, smooth and
round uniform shape
https://quizlet.com/1017872863/apex-ekg-test-comprehensive-study-guide-expert-strategies-review-of-key-quizzes-and-practice-questions-for-guaran… 3/17
APEX EKG Test / Comprehensive Study Guide –
Expert Strategies, Review of Key Quizzes, and
Practice Questions for Guaranteed Success /
Newest 2025/2026.
Save
Terms in this set (41)
Each small square (the smaller
lighter boxes within the big bold
boxes) represents 0.04 seconds
Each larger square (the boxes
EKG Grid within the bold lines) represents
0.2 seconds.
Each large square has 5 small
squares across SO 0.04 X 5 = 0.2
seconds
The 6 Second Strip Least accurate, but quickest way to estimate rate
Method especially in irregular rhythms
EKG
EKG intervals
https://quizlet.com/1017872863/apex-ekg-test-comprehensive-study-guide-expert-strategies-review-of-key-quizzes-and-practice-questions-for-guaran… 1/17
,3/13/25, 6:40 PM APEX EKG Test / Comprehensive Study Guide – Expert Strategies, Review of Key Quizzes, and Practice Questions for Guarantee…
P Wave Atrial depolarization
Normal is 0.12 to 0.20 seconds
PR Interval Corresponds to the delay the AV node provides to
allow for ventricular filling
Normal is <0.12 seconds usually between 0.06 to 0.10
QRS Complex seconds
Ventricular depolarization
QT Interval Normal 0.36-0.46
Determine Regularity
Calculate the Rate
6 Steps for Rhythm Evaluate the P wave
Interpretation Measure the PRI
Evaluate the QRS Width
Evaluate the T wave and Calculate the QTI
Regularity: atrial and ventricular rate are regular
Rate: 60 to 100 beats per minute
P wave: upright, smooth, round and uniform shape,
one for every QRS complex
Normal Sinus Rhythm
PRI : 0.12 to 0.20 seconds
QRS: 0.06 to 0.10 seconds
QTI: 0.36 to 0.46 seconds
T wave: upright, smooth and round uniform shape
Regularity: atrial and ventricular
rate are regular
Rate: < 60 beats per minute
P wave: upright, smooth, round
and uniform shape, one for
Sinus Bradycardia every QRS complex
PRI : 0.12 to 0.20 seconds
QRS: 0.06 to 0.10 seconds
QTI: 0.36 to 0.46 seconds
T wave: upright, smooth and
round uniform shape
https://quizlet.com/1017872863/apex-ekg-test-comprehensive-study-guide-expert-strategies-review-of-key-quizzes-and-practice-questions-for-guaran… 2/17
, 3/13/25, 6:40 PM APEX EKG Test / Comprehensive Study Guide – Expert Strategies, Review of Key Quizzes, and Practice Questions for Guarantee…
Regularity: atrial and ventricular
rate are regular
Rate: >100 beats per minute
P wave: upright, smooth, round
and uniform shape, one for
Sinus Tachycardia every QRS complex
PRI : 0.12 to 0.20 seconds
QRS: 0.06 to 0.10 seconds
QTI: 0.36 to 0.46 seconds
T wave: upright, smooth and
round uniform shape
Regularity: atrial and ventricular
rate are the same but the
rhythm will be slightly irregular
Rate: variable, can be
bradycardia to normal
P wave: upright, smooth, round
Sinus Arrhythmia and uniform shape, one for
every QRS complex
PRI : 0.12 to 0.20 seconds
QRS: 0.06 to 0.10 seconds
QTI: 0.36 to 0.46 seconds
T wave: upright, smooth and
round uniform shape
https://quizlet.com/1017872863/apex-ekg-test-comprehensive-study-guide-expert-strategies-review-of-key-quizzes-and-practice-questions-for-guaran… 3/17
