APEX EKG Test Exam Questions And Answers
|Latest Update 2026/27
EKG Grid
Each small square (the smaller lighter boxes within the big bold boxes) represents
0.04 seconds
Each larger square (the boxes 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 Method
Least accurate, but quickest way to estimate rate especially in irregular rhythms
EKG
,EKG intervals
P Wave
Atrial depolarization
, PR Interval
Normal is 0.12 to 0.20 seconds
Corresponds to the delay the AV node provides to allow for ventricular filling
QRS Complex
Normal is <0.12 seconds usually between 0.06 to 0.10 seconds
Ventricular depolarization
QT Interval
Normal 0.36-0.46
6 Steps for Rhythm Interpretation
Determine Regularity
Calculate the Rate
Evaluate the P wave
Measure the PRI
Evaluate the QRS Width
Evaluate the T wave and Calculate the QTI
Normal Sinus Rhythm
Regularity: atrial and ventricular rate are regular
Rate: 60 to 100 beats per minute
|Latest Update 2026/27
EKG Grid
Each small square (the smaller lighter boxes within the big bold boxes) represents
0.04 seconds
Each larger square (the boxes 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 Method
Least accurate, but quickest way to estimate rate especially in irregular rhythms
EKG
,EKG intervals
P Wave
Atrial depolarization
, PR Interval
Normal is 0.12 to 0.20 seconds
Corresponds to the delay the AV node provides to allow for ventricular filling
QRS Complex
Normal is <0.12 seconds usually between 0.06 to 0.10 seconds
Ventricular depolarization
QT Interval
Normal 0.36-0.46
6 Steps for Rhythm Interpretation
Determine Regularity
Calculate the Rate
Evaluate the P wave
Measure the PRI
Evaluate the QRS Width
Evaluate the T wave and Calculate the QTI
Normal Sinus Rhythm
Regularity: atrial and ventricular rate are regular
Rate: 60 to 100 beats per minute
