Final answer:
In the case of a propranolol overdose, a medical command physician should order glucagon, typically starting with an initial dose of 5 to 10 mg intravenously.
Step-by-step explanation:
The subject of this question pertains to the management of a propranolol overdose, which is a medical scenario where a 72-year-old female has taken an excessive amount of a beta-blocker medication. In such a case, the medical command physician may order the administration of glucagon as an antidote. The initial recommended dose for an adult is usually 5 to 10 milligrams (mg) intravenously, followed by a continuous infusion if necessary.
This is because glucagon has positive inotropic and chronotropic effects that can help overcome the beta-blockade caused by propranolol. It binds to its own receptors, leading to increased cyclic AMP and calcium influx into cells, with a subsequent increase in heart rate and myocardial contractility.