28. 有關 Local anaesthetic blocks and epidurals 下列敘述，何者為真？ (A) Pain relief from a saline „block‟ certainly by itself mean that the pain is „psychogenic‟ or that the patient is malingering. (B) Except for phantom limb pain, neurolytic, neurodestructive nerve blocks are often indicated for patients with chronic pain and a normal life expectancy. (C) A component of sympathetically maintained pain is present in about two-third of cases with CRPS types I and II. (D) Postoperative myocardial infarction, respiratory and renal failure, stroke, and in some studies even mortality, were reduced by perioperative lumbar epidural analgesia (E) The duration of pain relief after epidural steroid injections is reasonable to expect a longer effect in patients without a recurrent mechanical irritation of the nerve root after the pain is gone for this episode.