How dysrhythmias are tested on the NCLEX-RN
Expect items in Physiological Adaptation and Reduction of Risk Potential: identify the rhythm, decide whether the client is stable, and choose the first nursing action.
If the monitor shows ventricular fibrillation but the client is talking to you, check the leads. If the client is unresponsive and pulseless, call for help, start CPR, and get the defibrillator.
Rhythms the nurse must know
Rhythm recognition is tested, but always in the context of what to do.
| Rhythm | Strip features | Priority nursing action |
|---|---|---|
| Sinus bradycardia | Regular, rate <60, normal P before each QRS | If symptomatic: assess, notify, atropine as ordered; hold rate-slowing drugs per order |
| Sinus tachycardia | Regular, rate >100 | Treat the cause: pain, fever, hypovolemia, anxiety, hypoxia |
| Supraventricular tachycardia | Regular, narrow QRS, rate often 150–250, P waves hidden | Vagal maneuvers, then adenosine rapid IV push with flush, as ordered |
| Atrial fibrillation | Irregularly irregular, no distinct P waves | Rate control, anticoagulation, stroke-risk teaching |
| Premature ventricular contractions | Early wide bizarre QRS | Check K⁺ and Mg²⁺, oxygenation; report if frequent or new |
| Ventricular tachycardia | Wide QRS, regular, fast | Pulse? No: CPR + defibrillate. Yes and unstable: synchronized cardioversion |
| Ventricular fibrillation | Chaotic waveform, no QRS | CPR and immediate defibrillation |
| Asystole | Flat line (confirm in two leads) | CPR and epinephrine; do not shock |
Drug and energy choices follow current resuscitation guidelines and provider orders.
Shockable vs non-shockable arrest rhythms
A classic NCLEX distinction: which pulseless rhythms receive a shock.
| Synchronized cardioversion | Defibrillation | |
|---|---|---|
| Client has a pulse? | Yes | No |
| Timing | Shock timed to the R wave | Unsynchronized |
| Used for | Unstable SVT, atrial fibrillation or flutter, VT with a pulse | VF, pulseless VT |
| Nursing points | Sedation if possible, consent if not emergent; anticoagulation status for atrial fibrillation | Stand clear; resume CPR right after the shock |
For both, ensure no one touches the client or bed during the shock.
Electrolytes and drugs that trigger dysrhythmias
Many NCLEX dysrhythmia items are really electrolyte or medication-safety items.
NGN-style case and teaching
Prioritization items reward checking the client before reacting to the monitor.
A telemetry alarm shows ventricular fibrillation on a client who was talking 2 minutes ago. What is the nurse's first action?
- Recognize cues: the monitor shows VF, but a recent conversation raises the possibility of artifact.
- The first step is to look at the client: check responsiveness and pulse.
- If unresponsive and pulseless: call for help, start CPR, and defibrillate as soon as available.
- If alert with a pulse: check leads and electrodes.
Answer. Go to the client and check responsiveness and pulse. Treatment depends on whether the client is in true cardiac arrest.
- Teach clients with pacemakers to carry the device card, report dizziness or hiccups, and follow electromagnetic-interference precautions as instructed.
- Teach clients on antidysrhythmics to report palpitations, fainting, or a pulse below the prescribed limit.