Adenosine: 6-12-12 adenosine approach

The ACLS-recommended dosing strategy of 6 mg, 12 mg, and 12 mg for adenosine may not be appropriate in every situation. There are a few instances when lower or higher dosing should be considered.

Caveat: All recommendations are data-based, but many factors affect successful conversion of paroxysmal supraventricular tachycardia (PSVT) including proper line placement and administration technique.

Option 1: Starting at higher dose

Caffeine and theophylline: Caffeine is an adenosine blocker and can interfere with the successful reversion of PSVT. In fact, ingestion of caffeine less than 4 hours before a 6-mg adenosine bolus significantly reduced its effectiveness in the treatment of PSVT. An increased initial adenosine dose may be indicated for these patients.

Remember that theophylline may require higher dosing as well, because it is similar to caffeine (another methylxanthine), but is not prescribed much in the U.S. anymore.

Recommended dosing strategy [Cabalag, 2009]:

• 1st dose: 12 mg (instead of 6)
• 2nd/3rd doses: 18 mg (instead of 12)

Option 2: Starting at lower dose

Central Line: The initial adenosine dose should be reduced if administered through a central line. Remember a central line delivers the adenosine right where you need it. This recommendation is supported by the 2010 ACLS guidelines. Cases of prolonged bradycardia and severe side effects have been reported after full-dose adenosine through a central line.

Carbamazepine or Dipyridamole: Lower dose for patients on carbamazepine or dipyridamole

Transplanted heart: Lowr dose for patients with heart transplants

Recommended dosing strategy[Chang, 2002; Neumar, 2010; Mc-Intosh-Yellin, 1993]:

• 1st dose: 3 mg (instead of 6)
• 2nd/3rd doses: 6 mg (instead of 12)

ALiEM Blog Post

References

• McIntosh-Yellin NL, et al. Safety and efficacy of central intravenous bolus administration for termination of supraventricular tachycardia. J Am Coll Cardiol 1993;22:741-5. [PubMed]
• Cabalag MS, et al. Recent caffeine ingestion reduces adenosine efficacy in the treatment of paroxysmal supraventricular tachycardia. Acad Emerg Med 2009;17(1):44-9. [PubMed]
• Chang M, et al. Adenosine dose should be less when administered through a central line. J Emerg Med 2002;22(2):195-8 [PubMed]
• Neumar RW, et al. Part 8: Adult Advanced Cardiovascular Life Support: 2010 American Heart Association Guidelines for Cardiopulmonary Resuscitation and Emergency Cardiovascular Care. Circulation 2010;122:S729-S767. [PubMed]