45.Opioid analgesics以下列何種方式給藥，可以提供最佳的疼痛緩解？
(A)IM
(B)IV PCA（病人自控式止痛劑）
(C)IV
(D)epidural PCA

樓上資料很完整，但我還是不懂BD怎麼選，甚麼是最佳的疼痛緩解？

根據目前訊息，我猜 →

epidural PCA：適合做continuous basal infusion

IV PCA：bolus opioid doses

【uptodate】

As with intermittent opioid administration, the patient’s previous long-acting opioid should be continued, if possible.
If unable to do so, a continuous basal infusion on a PCA can be calculated to equal the patient’s previous baseline long-acting opioid dose.
The continuous rate should be reevaluated daily and decreased if the pain level decreases.
Clinician decision-making about when and how to add bolus opioid doses to the long-acting basal dose depends on the pattern and etiology of the acute pain.