Final answer:
The initial dose of adenosine is 6 mg, followed by a possible second dose of 12 mg for narrow complex tachycardia. If the tachycardia persists after the second dose, contact medical command for further instructions.
Step-by-step explanation:
You asked at what dose you are required to contact medical command for additional dosing when administering adenosine to a 24-year-old female patient experiencing a regular narrow complex tachycardia with a rate of 192 bpm. The initial dose of adenosine for adults is typically 6 mg given rapidly over 1-2 seconds, followed by a saline flush. If the first dose does not terminate the tachycardia, a second dose of 12 mg may be administered 1-2 minutes later. According to Advanced Cardiovascular Life Support (ACLS) guidelines, if the second dose of 12 mg does not resolve the tachycardia, you should contact medical command for instructions on additional dosing or alternative interventions. It's important to always follow updated ACLS protocols and the specific policies of your medical facility when treating cardiac emergencies like tachycardia.