Final answer:
The most important intervention for the nurse to implement is to continue resuscitative efforts.
Step-by-step explanation:
The most important intervention for the nurse to implement following a traumatic delivery and an initial Apgar score of 3 is to continue resuscitative efforts. The Apgar score is a quick assessment of the newborn's vital signs and overall well-being. A score of 3 indicates a critical situation, and immediate medical attention is needed to stabilize the newborn. The nurse should continue resuscitative efforts to support the infant's heart rate and respiration until the condition improves.