Adenosine dosing for SVT is which sequence?

Adenosine dosing for SVT is which sequence?

• A. 12 mg then 6 mg
• B. 3 mg then 6 mg
• C. 6 mg only
• D. 6 mg then 12 mg

Answer: (D)

Adenosine works by briefly blocking AV nodal conduction, which can interrupt AV-node–dependent SVT and reset the heart to a normal rhythm. Because its effect is rapid but very short-lived, the dosing is done in a quick, escalating sequence. Start with a rapid intravenous push of 6 mg and assess for conversion within about 1–2 minutes. If the tachycardia persists, give a rapid 12 mg IV push. This escalation matches how the drug behaves: a small initial dose that’s likely to terminate if the SVT is AV-node dependent, with a higher dose ready if needed. A single 6 mg dose might not terminate the rhythm, and starting with 12 mg first increases exposure to side effects without improving success in most cases.

Adenosine works by briefly blocking AV nodal conduction, which can interrupt AV-node–dependent SVT and reset the heart to a normal rhythm. Because its effect is rapid but very short-lived, the dosing is done in a quick, escalating sequence. Start with a rapid intravenous push of 6 mg and assess for conversion within about 1–2 minutes. If the tachycardia persists, give a rapid 12 mg IV push. This escalation matches how the drug behaves: a small initial dose that’s likely to terminate if the SVT is AV-node dependent, with a higher dose ready if needed. A single 6 mg dose might not terminate the rhythm, and starting with 12 mg first increases exposure to side effects without improving success in most cases.