Basic Dysrhythmia Review | Correct Questions & Verified Answers | Latest 2025

Basic Dysrhythmia Review | Correct
Questions & Verified Answers |
Latest 2025

normal sinus rhythm (NSR) Criteria: (PR, QRS, QT, Rhythm: reg or irreg)
1 P-wave for Every QRS, REGULAR rhythm
PR: 0.12-0.20
QRS: 0.06-0.10 BBB = > 0.12
QT: 0.36-0.44
BPM: 60-100




Sinus Bradycardia Criteria: (PR, QRS, QT, Rhythm: reg/irreg)
PR: 0.12-0.20
QRS: 0.06-0.10
QT: 0.36-0.44
BPM: < 60 (Reg. rate)
Tx: Atropine 0.5mg, Pace, Dopamine 2-10 mcg/kg/min, Epie 2-10 mcg/min




Brainpower
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Sinus Tachycardia Criteria: (PR, QRS, QT, Rhythm: reg/irreg)
PR: 0.12-0.20
QRS: 0.06-0.10
QT: 0.36-0.44
BPM: 100-150 (Reg. rate, P wave may merge with T-wave)
Cause: fear, anxiety, hypoxia, sepsis, hypovolemia, infection




Sinus Arrhythmia Criteria: (PR, QRS, QT, Rhythm: reg/irreg)
PR: 0.12-0.20
QRS: 0.06-0.10
QT: 0.36-0.44
BPM: HR increase w/ inspiration, HR decrease w/expiration

, P-P interval lengthen and shorten with respirations
Irreg Rhythm
NO TX




Sinus Pause Criteria: (PR, QRS, QT, Rhythm)
PR: 0.12-0.20
QRS: 0.06-0.10
QT: 0.36-0.44
Irregular rhythm
Short Pause: no TX; Long/Freq. Pause & symptomatic = TX like Sinus Brady




Premature Atrial Contraction (PAC)
Heart Rate: Depends on underlying rhythm
Regularity: Interrupts the regularity of underlying rhythm
P-Wave: can be flattened, notched, or unusual. May be hidden within the T wave
PRI: measures between .12-.20 seconds and can be prolonged; can be different from
other complexes
QRS: <.12 seconds
TX: none, check Lytes, precursor for A-Fib/Flutter




Atrial Fibrillation (A-Fib) (PR, QRS, QT, RHYTHM, TX)
PR: Can't Measure NO P WAVE
QRS: 0.06-0.10
QT: May/May Not be Measurable
Rhythm: IRREGULARLY IRREGULAR
Rate: Atrial >400 BPM
Tx: Diltiazem (Cardizem), Amiodarone, Beta Blocker (Lopressor), Digoxin, Anti-Coag
(Heparin), Cardiovert