For unstable SVT, which energy settings are used for synchronized cardioversion?

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Multiple Choice

For unstable SVT, which energy settings are used for synchronized cardioversion?

When a patient with SVT is unstable, the goal is to quickly convert the rhythm with a synchronized shock that is timed to the QRS complex to avoid delivering on the T wave. The energy is delivered in an escalating ladder to maximize the chance of conversion while minimizing myocardial injury. Start with a moderate high energy of 120–200 J, and if the rhythm does not convert, increase to 300 J, then to 360 J. This sequence reflects how many defibrillators are programmed for synchronized cardioversion of unstable tachyarrhythmias: begin with a substantial energy, then step up if needed until the rhythm is terminated. Remember to ensure synchronization so the shock is delivered on the R wave, which reduces the risk of inducing ventricular fibrillation. Lower initial energies (like 50–100 J) are not the recommended starting point for unstable SVT in this protocol, whereas the stated ladder provides the escalation approach used in practice.

When a patient with SVT is unstable, the goal is to quickly convert the rhythm with a synchronized shock that is timed to the QRS complex to avoid delivering on the T wave. The energy is delivered in an escalating ladder to maximize the chance of conversion while minimizing myocardial injury. Start with a moderate high energy of 120–200 J, and if the rhythm does not convert, increase to 300 J, then to 360 J. This sequence reflects how many defibrillators are programmed for synchronized cardioversion of unstable tachyarrhythmias: begin with a substantial energy, then step up if needed until the rhythm is terminated. Remember to ensure synchronization so the shock is delivered on the R wave, which reduces the risk of inducing ventricular fibrillation. Lower initial energies (like 50–100 J) are not the recommended starting point for unstable SVT in this protocol, whereas the stated ladder provides the escalation approach used in practice.

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