age 1 of 27
Basic Dysrhythmias & EKG Interpretation FINAL EXAM
PREP 2025/2026 ACCURATE QUESTIONS WITH
CORRECT DETAILED ANSWERS || 100%
GUARANTEED PASS <RECENT VERSION>
Normal Sinus Rhythm .......Answer.........NSR
Rate: 60-100 bpm
Regularity: Regular
P Waves: Normal
PR Interval: 0.12-0.20 s
QRS Duration: 0.04-0.12 s
QT Duration: 0.36-0.44 s
Sinus Node .......Answer.........Sinus Node Problems:
,age 2 of 27
The SA node can:
--Fire too slow (Sinus Bradycardia [SB])
--Fire too fast (Sinus Tachycardia [ST])
Sinus Bradycardia (SB) .......Answer.........Rate <60 bpm
Etiology--SA node is depolarizing slower than normal, impulse is
conducted normally
--Normal PR interval and QRS interval
--Once SA node fires, everything else happens normal
Can be normal for super athletes
Sinus Tachycardia (ST) .......Answer.........May be appropriate
response to stress
Rate >100 bpm
, age 3 of 27
Etiology--SA node is depolarizing faster than normal, impulse is
conducted normally
Remember: it is a response to physical or psychological stress,
not primary arrhythmia
Atrial cells .......Answer.........Atrial Arrhythmias
Atrial cells can:
--Fire occasionally from a focus (Premature Atrial Contractions
[PACS])
--Fire continuously due to a looping re-entrant circuit (Atrial
Flutter)
--Fire continuously from multiple foci OR fire continously due to
multiple micro re-entrant "wavelets" (Atrial Fibrillation)
Basic Dysrhythmias & EKG Interpretation FINAL EXAM
PREP 2025/2026 ACCURATE QUESTIONS WITH
CORRECT DETAILED ANSWERS || 100%
GUARANTEED PASS <RECENT VERSION>
Normal Sinus Rhythm .......Answer.........NSR
Rate: 60-100 bpm
Regularity: Regular
P Waves: Normal
PR Interval: 0.12-0.20 s
QRS Duration: 0.04-0.12 s
QT Duration: 0.36-0.44 s
Sinus Node .......Answer.........Sinus Node Problems:
,age 2 of 27
The SA node can:
--Fire too slow (Sinus Bradycardia [SB])
--Fire too fast (Sinus Tachycardia [ST])
Sinus Bradycardia (SB) .......Answer.........Rate <60 bpm
Etiology--SA node is depolarizing slower than normal, impulse is
conducted normally
--Normal PR interval and QRS interval
--Once SA node fires, everything else happens normal
Can be normal for super athletes
Sinus Tachycardia (ST) .......Answer.........May be appropriate
response to stress
Rate >100 bpm
, age 3 of 27
Etiology--SA node is depolarizing faster than normal, impulse is
conducted normally
Remember: it is a response to physical or psychological stress,
not primary arrhythmia
Atrial cells .......Answer.........Atrial Arrhythmias
Atrial cells can:
--Fire occasionally from a focus (Premature Atrial Contractions
[PACS])
--Fire continuously due to a looping re-entrant circuit (Atrial
Flutter)
--Fire continuously from multiple foci OR fire continously due to
multiple micro re-entrant "wavelets" (Atrial Fibrillation)
