For synchronized cardioversion, what energy levels are used for PSVT and for atrial fibrillation or ventricular tachycardia?

For synchronized cardioversion, what energy levels are used for PSVT and for atrial fibrillation or ventricular tachycardia?

• A. 25J and 50J
• B. 100J and 200J
• C. 50J and 100J
• D. 75J and 150J

Answer: (C)

The main idea is that the energy used for synchronized cardioversion depends on the rhythm being treated. PSVT, a narrow complex tachycardia, usually responds to a lower-energy shock. A starting dose of about 50 joules is commonly effective, with the option to increase if needed. In contrast, atrial fibrillation or atrial flutter, and ventricular tachycardia with a pulse, are more resistant and typically require a higher-energy shock to achieve conversion. Starting around 100 joules is standard for these rhythms, with adjustments up or to higher levels based on the device and clinical response. The goal is to deliver the shock in synchronization with the R wave to avoid inducing another dangerous rhythm, while using enough energy to terminate the arrhythmia efficiently.

The main idea is that the energy used for synchronized cardioversion depends on the rhythm being treated. PSVT, a narrow complex tachycardia, usually responds to a lower-energy shock. A starting dose of about 50 joules is commonly effective, with the option to increase if needed. In contrast, atrial fibrillation or atrial flutter, and ventricular tachycardia with a pulse, are more resistant and typically require a higher-energy shock to achieve conversion. Starting around 100 joules is standard for these rhythms, with adjustments up or to higher levels based on the device and clinical response. The goal is to deliver the shock in synchronization with the R wave to avoid inducing another dangerous rhythm, while using enough energy to terminate the arrhythmia efficiently.