Nursing care
Ventricular Tachycardia nursing care: what to assess and what to do first
Written and reviewed by Dana Whitfield, RN, MSN · 5 min read · Updated September 2026
Short answer
Ventricular tachycardia nursing care starts with checking for a pulse. If a pulse is present and the patient is stable, treatment is antiarrhythmics or synchronised cardioversion. If there is no pulse, it is treated as a shockable arrest rhythm with immediate defibrillation and CPR. The pulse check decides everything that follows.
What it is and why it happens
Ventricular tachycardia (VT) is three or more consecutive ventricular beats at a rate above 100 beats per minute, usually 150 to 250. It originates from an ectopic focus or re-entry circuit in the ventricular myocardium, bypassing the normal conduction pathway. The QRS complex is wide, typically over 0.12 seconds, because depolarisation spreads cell to cell through muscle rather than the His-Purkinje system.
Most cases occur on a background of structural heart disease: prior myocardial infarction with scar tissue, cardiomyopathy, or heart failure. Electrolyte disturbance, particularly hypokalaemia and hypomagnesaemia, lowers the threshold for it. QT-prolonging drugs, digoxin toxicity, and cocaine use are recognised triggers. VT can be sustained, lasting more than 30 seconds, or non-sustained, and monomorphic or polymorphic depending on whether the QRS shape is consistent.
How it presents — what you will actually see
Presentation depends entirely on whether the patient still has a pulse and adequate cardiac output. A stable patient with pulseless VT that hasn't yet lost perfusion may report palpitations, chest discomfort, dizziness or mild shortness of breath, and will still have a measurable blood pressure. An unstable patient with a pulse shows hypotension, altered mental status, chest pain, and signs of poor perfusion — cool skin, prolonged capillary refill.
Pulseless VT looks like cardiac arrest: no palpable pulse, no respiratory effort, unresponsive. The monitor shows the same wide-complex tachycardia in both scenarios, which is why the rhythm strip alone never tells you what to do next. Sudden collapse in a patient with known ischaemic heart disease should raise suspicion for VT even before the monitor confirms it.
Nursing assessment priorities
The single priority assessment is the pulse check, and it is the step that gets skipped under pressure. Check for a carotid or femoral pulse for no more than 10 seconds while simultaneously assessing level of consciousness and breathing. Everything downstream — drug therapy versus defibrillation — depends on this one finding, so it cannot be assumed from the monitor.
If a pulse is present, assess haemodynamic stability: blood pressure, mental status, chest pain, signs of heart failure such as crackles or jugular venous distension. Obtain a 12-lead ECG if the patient's condition allows it, confirm the rhythm is truly VT and not a supraventricular rhythm with aberrant conduction, and check electrolytes — potassium, magnesium, calcium — and a recent troponin. Review medication history for QT-prolonging agents and digoxin level if relevant.
Interventions and what to do first
With a pulse, stable VT is treated pharmacologically — amiodarone is first-line per ACLS, with procainamide or sotalol as alternatives. Unstable VT with a pulse is treated with synchronised cardioversion: the shock is timed to the R wave to avoid landing on the T wave and inducing ventricular fibrillation. Sedate the patient first if time and condition permit.
Without a pulse, VT is managed exactly like ventricular fibrillation: begin CPR immediately and defibrillate as soon as the device is ready, unsynchronised. This is not the moment to look for a rhythm-specific drug protocol first — compressions and the shock take priority, followed by epinephrine and continued CPR cycles per ACLS. Confirming pulselessness quickly, rather than assuming it, is what separates the correct pathway from a dangerous delay.
Complications to watch for
Sustained VT can deteriorate into ventricular fibrillation at any point, so continuous cardiac monitoring and a defibrillator within reach are non-negotiable, even once the patient appears stabilised. Cardioversion carries a small risk of transient bradyarrhythmia or, rarely, precipitating VF if not properly synchronised — hence the emphasis on sync mode.
Watch for recurrent episodes, especially if the underlying trigger — electrolyte imbalance, ischaemia, drug toxicity — has not been corrected. Amiodarone can cause hypotension and bradycardia during infusion, so monitor blood pressure and rhythm closely. Patients who survive an episode are at risk of hypoxic brain injury if the arrest phase was prolonged, and should be assessed neurologically once stable.
Patient teaching before discharge
Patients going home after a VT event, particularly those receiving an implantable cardioverter-defibrillator (ICD), need to understand what an ICD shock feels like and that a single shock followed by feeling well does not require an ambulance call, but recurrent shocks or a shock with ongoing symptoms does. Explain arm restrictions on the ICD side during the initial healing period per the surgical team's instructions.
Reinforce adherence to antiarrhythmic medication and any beta-blocker prescribed, and explain that missed doses can precipitate recurrence. Cover recognition of warning symptoms — palpitations, presyncope, chest pain — and when to seek urgent care versus routine follow-up. Address modifiable triggers relevant to that patient: electrolyte monitoring if on diuretics, avoidance of QT-prolonging over-the-counter drugs, and abstinence from stimulant use where relevant.
The next step on this is the same as on everything else here: answer questions and read the rationales. Our cardiovascular practice questions are the closest set to what this page covers.
Common questions
Is ventricular tachycardia always a shockable rhythm?
Only pulseless VT is shockable and treated with immediate defibrillation, the same as ventricular fibrillation. VT with a pulse is managed with antiarrhythmic drugs if the patient is stable, or synchronised cardioversion if unstable — a different shock delivery from defibrillation.
What is the difference between synchronised cardioversion and defibrillation in VT?
Synchronised cardioversion times the shock to the R wave to avoid the vulnerable T wave, and is used for VT with a pulse. Defibrillation is unsynchronised and delivered immediately, used only when there is no pulse, because there is no organised rhythm to synchronise to.
Why does the pulse check matter so much in VT?
The monitor shows the same wide-complex rhythm whether or not the patient has a pulse, so the strip alone cannot guide treatment. The pulse check determines whether you reach for antiarrhythmic drugs and cardioversion, or start CPR and defibrillate — getting this wrong delays the correct intervention.
What is the first-line drug for stable VT with a pulse?
Amiodarone is first-line per ACLS guidance for stable, sustained monomorphic VT with a pulse. Procainamide and sotalol are recognised alternatives depending on the patient's other conditions and local protocol.
What electrolyte levels should be checked in a patient with VT?
Check potassium and magnesium as a priority, since low levels of either lower the threshold for ventricular arrhythmias. Calcium and a recent troponin should also be reviewed to assess for ischaemic cause.
More on cardiovascular
Guides on this