Articles: opioid-analgesics.
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Cerebral dysfunction due to long-term treatment with opioids is a problem of increasing relevance because of the rapidly growing use of opioids. A review of psychomotor and cognitive test methods is given, including their application in patients on long-term opioid treatment. The findings of the most valid studies on cancer patients in long-term treatment with opioids are an increase in continuous reaction time and subjective sedation score regardless of the routes of administration. ⋯ According to recent studies, patients with chronic non-malignant pain conditions are responsible for the major part of the total opioid consumption. So far, no studies of cerebral dysfunction have been performed on this group of patients. Further research should concentrate on the use of few valid psychomotor and cognitive tests and should include patients with chronic non-malignant pain conditions.
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The spectrum of perioperative pain treatment is discussed in the present review. The analgesic efficacy of various drugs and the dosage methods of administration and side effects reported for them in such reference works as the practical guide on the management of acute pain recently published by the International Association for the Study of Pain (IASP) are described. Effective postoperative analgesia can diminish stress reactions following surgery. ⋯ Investigations performed by the author of this review have shown that epidural infusion of highly diluted mixtures of bupivacaine/fentanyl is highly effective in the analgesic treatment of patients undergoing prostatectomy, providing excellent physical mobilization. The potential dangers of drug combinations and contraindications are also discussed. The concept of using balanced analgesia to induce additive or synergistic effects following the administration of analgesic drugs requires further clinical studies.
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In a double-blind, randomized, placebo-controlled study, 86 patients (44 verum, 42 placebo), scheduled for knee-joint arthrotomies or minor orthopaedic operations received either naproxen, a nonsteroidal antiinflammatory analgesic, or placebo orally in three doses: the first immediately before the operation and the others 6 h and 12 h after the first. The verum group received 1250 mg naproxen in total. Postoperative pain intensity was measured by the category splitting procedure. ⋯ The intensity of typical side effects of opioids and antipyretic anti-inflammatory analgesics (nausea, vomiting, stomachache, headache, vertigo) was low and they were easily controlled in all cases. Lowering of respiratory frequency was not observed. Perioperative administration of the nonsteroidal anti-inflammatory analgesic naproxen results in better pain relief and significantly lower opioid requirements (by about 46%) after minor orthopaedic surgery.
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In the last few years great interest has developed in new modes of opioid administration; oral transmucosal, transdermal, peripheral, and nasal administration. Oral transmucosal administration of fentanyl citrate (OTFC) has most often been used for premedication in children. Meanwhile, studies on the use of OTFC in cancer patients for postoperative pain management have also been published. ⋯ Nonetheless, intranasal opioids guarantee a rapid rise in opioid plasma concentrations as well as a rapid onset of pain relief. This mode of administration seems to be especially suitable for the treatment of acute pain syndromes, such as breakthrough cancer pain or incident pain. Patient acceptance is high, and no local problems were reported.
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Abdominal pain is an important and the most frequent symptom of acute gastrointestinal diseases; crucial hints on the diagnosis can be gleaned from its location and from associated symptoms and signs. As symptomatic therapy the treatment of pain plays a major role in acute gastrointestinal diseases, e.g. the acute abdomen, acute pancreatitis, biliary colic, peptic ulcer disease and diverticulitis. ⋯ Acute severe pain arising from biliary colic and acute pancreatitis should be treated with an opioid that does not influence the sphincter of Oddi or the pressure in the common bile duct, e.g. buprenorphine, nalbuphine or tramadol. An effective but not widely known therapy for colic pain is parenteral administration of a nonsteroidal anti-inflammatory drug, e.g. indomethacin or diclofenac.