A patient who had a motor vehicle crash 2 days ago is experiencing pain and is receiving patient-controlled analgesia (PCA). Which assessment finding indicates effective pain management with the PCA?

Choice A reason: Sufficient medication in the PCA syringe does not indicate effective pain management. It may reflect underuse due to inadequate pain control or patient misunderstanding of PCA use. Pain relief is assessed by patient-reported outcomes, not medication volume remaining. Choice B reason: Sleeping and being difficult to arouse suggests oversedation, a potential adverse effect of PCA, particularly with opioids. This indicates excessive dosing rather than effective pain management, risking respiratory depression or other complications, requiring immediate dose adjustment or monitoring. Choice C reason: A pain rating of 2 on a 0 to 10 scale indicates effective pain management. PCA allows patients to self-administer doses within safe limits, achieving low pain levels without excessive sedation, reflecting optimal balance of analgesia and patient safety post-trauma. Choice D reason: Pressing the PCA button shows patient engagement but not pain control effectiveness. Frequent pressing may indicate inadequate relief, while infrequent use could reflect sufficient control or misunderstanding. Patient-reported pain levels are the primary indicator of PCA efficacy.