Journal of pain & palliative care pharmacotherapy
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J Pain Palliat Care Pharmacother · Jun 2014
Clinical TrialA transit compartment model unmasks OxyContin's reflective pharmacokinetics from urine measurements in humans.
The absorption pattern of orally administered OxyContin (OXC) reflected in urine indicates that its appearance into systemic circulation undergoes transit absorption delays. The authors developed an OXC transit-delay compartment model that identified a new source of oxycodone hydrochloride (OC): the rate of appearance of OC due to OXC tablet dissolution in transit through the gastrointestinal (GI) tract (R(a)(GI)), which is due to disintegration of OXC's AcroContin delivery system. R(a)(GI) is independent of the biphasic dissolution and release of OC from the delivery system. The authors conclude that an OXC transit-delay compartment model can be of value in the interpretation of OXC pharmacokinetics.
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J Pain Palliat Care Pharmacother · Jun 2014
Randomized Controlled TrialChronic postthoracotomy pain and perioperative ketamine infusion.
The objectives of this study were to investigate whether continuous intravenous ketamine during the first 72 hours after thoracotomy could reduce the incidence and intensity of chronic postthoracotomy pain (CPTP) and to define the incidence and risk factors of CPTP. Seventy-eight patients receiving thoracotomy for lung tumor (benign or malignant) were randomly divided into two groups: ketamine group (n = 31) and control groups (n = 47). Patients in the ketamine group received intravenous ketamine 1 mg/kg before incision, followed by 2 μg/kg/minute infusion for 72 hours plus sufentanil patient-controlled intravenous analgesia after thoracotomy. ⋯ Retractor used time (OR = 5.811, P = .002), inadequate acute pain control (NRS ≥ 5) (OR = 5.425, P = .048), and chemotherapy (OR = 3.784, P = .056) were independent risk factors for chronic postthoracotomy pain. The authors conclude that continuous intravenous ketamine (2 μg/kg/min) during the first 72 hours after thoracotomy was not beneficial to prevent chronic postthoracotomy pain. The independent risk factors for chronic postthoracotomy pain were retractor used time, inadequate acute pain control, and chemotherapy.
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J Pain Palliat Care Pharmacother · Jun 2014
Case ReportsSubacute pain after total knee arthroplasty.
Acute pain during and immediately after total knee arthroplasty (TKA) can be well controlled by spinal anesthesia, local infiltration analgesia, and peripheral nerve blocks; this enables early or fast-track rehabilitation. However, about half of patients have clinically significant pain in the following weeks. ⋯ Intensive analgesic and antihyperalgesic treatment during the first few weeks after TKA surgery may reduce the risk of chronic pain after this operation, which is itself intended to remove the patient's chronic osteoarthritis pain. Spinal cord stimulation may be an effective option for patients with mainly neuropathic pain after TKA surgery.
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J Pain Palliat Care Pharmacother · Jun 2014
Case ReportsA case of severe low back pain after surgery.
The etiology of chronic back pain is often unknown but can include failed spinal surgery. Pain can often be of mixed type and it is important to evaluate pain mechanisms. Comorbid factors often contribute to pain chronicity. ⋯ Other rehabilitative procedures such as physiotherapy, exercise therapy, and good sleep hygiene may have a profound impact on patient quality of life. Spinal cord stimulation may be an effective option for some patients with failed spinal surgery syndrome. A case of severe low back pain after surgery in a 45-year-old man is presented to illustrate this.
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Human animals have evolved with the primary missions of survival and reproduction and these natural drives may impact behavior whether humans are aware of them or not. The author offers evidence in support of the idea that injury and resulting acute or chronic pain may trigger the unconscious human primate brain to believe there is a threat to survival. This perceived threat may be exacerbated or mitigated by the pain manager, both of which may impact health outcomes in a negative or positive way, respectively. The commentary argues the patient-health care provider relationship is of paramount importance for those with chronic pain and illness and should be nurtured for the best possible outcomes.