Final answer:
In a noisy environment where a medication dosage is unclear, the best action is for the team member to confirm the order with the physician to ensure patient safety and care accuracy.
Step-by-step explanation:
The best response from the team member who thinks he heard an order for 500 mg of amiodarone IV in a very noisy environment would be to confirm the order with the physician. By asking another team member to clarify the order, the team can ensure that the correct dosage of amiodarone is administered. Clear communication is critical in medical settings, especially during resuscitations, and any miscommunication can have serious consequences. Therefore, it is imperative to ensure that all orders are heard correctly and verified before any medication is administered.