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Biomedical subjects

John D Loeser

Publications and source records attributed to John D Loeser.

At least 19 recordsLinked to original sources
PubMed2006

Epidural analgesia in a patient with an intrathecal catheter and subcutaneous pump to deliver baclofen.

Baclofen is used for the treatment of spasticity. Small doses administered intrathecally achieve high cerebrospinal fluid concentrations with reduced side-effects. Pediatric anesthesiologists are often reluctant to consider epidural analgesia in children receiving baclofen via an intrathecal catheter and subcutaneous pump. This reluctance is based on concerns for damaging the intrathecal catheter and introducing infection. In addition, the acute cessation of intrathecal baclofen can precipitate a life-threatening withdrawal state. We report a case of successful epidural analgesia in a patient receiving intrathecal baclofen and discuss the steps we took to minimize the chance of harm with this technique. We conclude that an intrathecal catheter and subcutaneous pump to deliver baclofen should not preclude the use of an epidural catheter for perioperative analgesia.

Adolescent↗
PubMed2005

Pain: disease or dis-ease? The John Bonica Lecture: presented at the third World Congress of World Institute of Pain, Barcelona 2004.

Chronic pain has only recently been recognized as an important health care issue. There is no widely shared agreement as to the best ways to diagnose and treat chronic pain patients. Pain management is a chaotic component of contemporary medicine. I argue that we need to think of chronic pain as a disease in its own right and develop our specialty of pain management on the basis of evidence for treatment outcomes. The current chaotic state confuses patients, health care providers, and payers. It is possible that pain management may disappear from health care if we do not improve our understanding of chronic pain and how to best treat those who suffer.

Journal Article↗
PubMed2004

Spinal cord stimulation for patients with failed back surgery syndrome or complex regional pain syndrome: a systematic review of effectiveness and complications.

We conducted a systematic review of the literature on the effectiveness of spinal cord stimulation (SCS) in relieving pain and improving functioning for patients with failed back surgery syndrome and complex regional pain syndrome (CRPS). We also reviewed SCS complications. Literature searches yielded 583 articles, of which seven met the inclusion criteria for the review of SCS effectiveness, and 15 others met the criteria only for the review of SCS complications. Two authors independently extracted data from each article, and then resolved discrepancies by discussion. We identified only one randomized trial, which found that physical therapy (PT) plus SCS, compared with PT alone, had a statistically significant but clinically modest effect at 6 and 12 months in relieving pain among patients with CRPS. Similarly, six other studies of much lower methodological quality suggest mild to moderate improvement in pain with SCS. Pain relief with SCS appears to decrease over time. The one randomized trial suggested no benefits of SCS in improving patient functioning. Although life-threatening complications with SCS are rare, other adverse events are frequent. On average, 34% of patients who received a stimulator had an adverse occurrence. We conclude with suggestions for methodologically stronger studies to provide more definitive data regarding the effectiveness of SCS in relieving pain and improving functioning, short- and long-term, among patients with chronic pain syndromes.

Back Pain↗
PubMed2004

Complex regional pain syndrome as a stress response.

A man in his 50's with a prior traumatic brain injury and multiple psychiatric disorders developed acute pain and swelling in his left leg distal to the mid shin. These symptoms arose during an exacerbation of his post-traumatic stress disorder (PTSD). Among his traumatic memories, he reported having witnessed the combat injury and death of a friend who had lost his left leg distal to the mid shin. A diagnosis of conversion disorder was technically excluded because the findings met criteria for Complex Regional Pain Syndrome (CRPS) type I. Based on recent research into the neurobiology of CRPS, PTSD and conversion disorder, we propose a supraspinal mechanism which could explain how emotional stress can produce both symptoms and signs.

Antidepressive Agents↗
PubMed2004

Pain, impairment, and disability in the AMA guides.

Physicians use the American Medical Association's Guides to the Evaluation of Permanent Impairment, 5th edition to evaluate millions of disability applicants each year. As major contributors to the chapter in the Guides devoted to assessing impairment associated with pain, we confronted the difficulties of incorporating pain into the Guides' overall evaluation system. Analysis of these difficulties is complicated by the paucity of research on the Guides, and by ambiguities and contradictions that pervade it. We propose that the ambiguities can be reduced if impairment is consistently defined in terms of organ or body part derangement, and disability in terms of activity limitations at the level of the whole person. We also propose a distinction between objective factors that may influence a person's ability to perform activities following injury. We suggest that when physicians examine disability applicants, they should evaluate both objective measures of organ or body part dysfunction and subjective reports of applicants -- especially ones regarding pain. We conclude that a comprehensive medical evaluation of disability applicant encompasses more than an impairment assessment.

Activities of Daily Living↗
PubMed2004

Failure of autologous bone-assisted cranioplasty following decompressive craniectomy in children and adolescents.

OBJECT: The authors have routinely performed primary autologous cranioplasty to repair skull defects after decompressive craniectomy. The high rates of subsequent bone resorption occurring in children prompted this study. METHODS: In an institutional review, the authors identified 40 (32 male and eight female) children and adolescents ranging from 4 months to 19 years of age in whom autologous cranioplasty was performed after decompressive craniectomy. The defect surface area ranged from 14 to 147 cm2. In all cases, the bone was fresh frozen at the time of the decompression. Symptomatic bone resorption subsequently occurred in 20 children (50%) in all of whom reoperation was required. The incidence of bone resorption significantly correlated with an increased skull defect area (p < 0.025). No significant correlation was found with age, sex, or anatomical location of the skull defect, number of fractured bone fragments, presence of a shunt, cause for decompressive craniectomy, method of duraplasty, or interval between the craniectomy and the cranioplasty. Reoperation to repair the resorbed autologous bone was performed 2 to 76 months after the initial procedure. CONCLUSIONS: The use of autologous bone to reconstruct skull defects in pediatric patients after decompressive craniectomy is associated with a high incidence of bone resorption. The use of autologous bone should be reevaluated in light of the high rate of reoperation in this pediatric population.

Adolescent↗
PubMed2003

Advances in neuropathic pain: diagnosis, mechanisms, and treatment recommendations.

Chronic neuropathic pain, caused by lesions in the peripheral or central nervous system, comes in many forms. We describe current approaches to the diagnosis and assessment of neuropathic pain and discuss the results of recent research on its pathophysiologic mechanisms. Randomized controlled clinical trials of gabapentin, the 5% lidocaine patch, opioid analgesics, tramadol hydrochloride, and tricyclic antidepressants provide an evidence-based approach to the treatment of neuropathic pain, and specific recommendations are presented for use of these medications. Continued progress in basic and clinical research on the pathophysiologic mechanisms of neuropathic pain may make it possible to predict effective treatments for individual patients by application of a pain mechanism-based approach.

Analgesics↗
PubMed2003

Oral motor, communication, and nutritional status of children during intrathecal baclofen therapy: a descriptive pilot study.

OBJECTIVE: To describe the oral motor, communication, and nutritional status of children receiving intrathecal baclofen (ITB) therapy for spasticity of cerebral origin. DESIGN: Observational cross-sectional design. SETTING: Tertiary-care regional children's hospital. PARTICIPANTS: Thirty children with spasticity of cerebral origin receiving ITB therapy. INTERVENTIONS: Not applicable. MAIN OUTCOME MEASURES: One interviewer administered a structured in-person interview tool designed for this pilot study, data from which were collapsed into 4 change categories: communication and speech, feeding and nutrition, oral motor function, and gastrointestinal function. Functional severity was ranked with the Gross Motor Function Classification System (GMFCS). RESULTS: Speech: 10 improved (5 in GMFCS level V) and 2 worsened. Use of assistive technology to communicate: 6 improved (5 in GMFCS level V). Appetite: 10 improved (6 in GMFCS level V) and 4 worsened. Self-feeding: 9 improved (2 in GMFCS level III, 4 in level IV, 3 in level V) and 2 worsened. Saliva control: 10 improved (1 in GMFCS level III, 1 in level IV, 8 in level V) and 8 worsened. Cup drinking: 12 improved (5 in GMFCS level V) and 2 worsened. Indicates thirst: 9 improved (4 in GMFCS level IV, 5 in level V) and none worsened. Stool frequency: 8 improved (8 in GMFCS level V) and 14 worsened. CONCLUSIONS: Some aspects of speech, communication, and saliva control seemed to have improved, with bowel movement frequency decreased in some children receiving ITB. Fewer changes in feeding and nutritional status were reported. On the basis of this pilot study, prospective management guidelines are proposed that relate objective outcome measures of oral motor function, communication, and nutrition to changes in spasticity with ITB.

Adolescent↗
PubMed2002

Efficacy of amitriptyline for relief of pain in spinal cord injury: results of a randomized controlled trial.

Chronic pain in persons with spinal cord injury (SCI) is a difficult problem for which there is no simple method of treatment. Few randomized controlled trials of medications for pain in persons with SCI have been conducted. This study was designed to determine whether amitriptyline, a tricyclic antidepressant, is efficacious in relieving chronic pain and improving pain-related physical and psychosocial dysfunction in persons with SCI. Eighty-four participants with SCI and chronic pain were randomized to a 6-week trial of amitriptyline or an active placebo, benztropine mesylate. All pre- and post-treatment assessments were conducted by evaluators blind to the allocation. Regression analyses were conducted to examine whether there was a medication group effect on the primary (average pain intensity) and secondary outcome measures. No significant differences were found between the groups in pain intensity or pain-related disability post-treatment, in either intent-to-treat analyses or analyses of study completers. These findings do not support the use of amitriptyline in the treatment of chronic pain in this population, but we cannot rule out the possibility that certain subgroups may benefit.

Adult↗
PubMed2002

Long-term safety and efficacy of continuous intrathecal baclofen.

Long-term continuous intrathecal baclofen (CITB) infusion is a treatment option used to manage otherwise intractable spasticity and is delivered via an implantable pump. The purpose of this single-center multidisciplinary review was to report on the long-term safety and efficacy of CITB in the treatment of 21 children with intractable severe spasticity of cerebral origin. Nineteen recipients had spastic quadriplegia and two had spastic diplegia. Seven recipients had level IV severity on the Gross Motor Functional Classification System and 14 had level V. Median age at implantation was 12 years (range 4 to 20). Fifteen recipients were male, 6 were female. Seventeen recipients were alive at the end of the follow-up period (31 to 78 months; mean 53, SD 4). The Ashworth scale showed a substantial decrease in spasticity in the upper and lower extremities at 6 months and at the most recent follow-up. The Gross Motor Function Measure and Pediatric Evaluation of Disability Inventory showed no functional change. Most treatment goals were at least partly achieved. Caregivers reported a reduction in use of oral medication for spasticity, and improvements in comfort, function, and ease of care. Caregiver satisfaction was high. During 80 recipient-years of pump operation, 153 treatment-associated adverse events occurred: 27 of these were device-related. There were four deaths unrelated to CITE, including one from acute pancreatitis. Our findings might assist in establishing patient selection criteria and treatment goals, improving patient follow-up, and monitoring adverse events.

Adolescent↗
PubMed2002

Onlay bone graft augmentation for refined correction of coronal synostosis.

OBJECTIVE: The primary purpose of this study was to evaluate the long-term result of an onlay bone graft augmentation of the supraorbital ridge at the time of primary correction of coronal suture synostosis. DESIGN: The study is a retrospective review of 62 consecutive patients treated for coronal synostosis from June 1991 through February 1997. The surgical technique utilized involved a standard bilateral fronto-orbital advancement and calvarial reshaping with the addition of an onlay bone graft in the supraorbital region. SETTING: All patients were treated at a tertiary care craniofacial center. RESULTS AND CONCLUSION: A total of 62 patients were treated by this technique. Fifty patients underwent primary correction as infants (mean age 9.8 months). An additional 12 patients were older (mean age 8.2 years) and were treated for residual deformity having previously undergone correction by another technique. Results with follow-up as long as 7 years demonstrate stable forehead and orbital symmetry. Complications identified by chart review were minimal and not directly attributable to this modification in surgical technique.

Bone Transplantation↗
PubMed1988

When back pain becomes disabling: a regional analysis.

Back pain is a common condition and in most cases is not disabling. We have investigated disabling back pain that leads to health care utilization, time lost from work, and high costs. Disabling back pain remains of obscure origin because the focus in studying it has been too narrow. Our indicator of disability is the industrial insurance claim rate for back sprain by county (N = 39) in the State of Washington. After controlling for the size of the labor force and the proportion of workers in occupations that are particularly at risk of back sprain, we determined the effect of 3 socioeconomic factors on the claim rate: the unemployment rate, percentage receiving food stamps, and per capita income. For 2 of the 3 years studied, socioeconomic factors accounted for about one-third of the variance in the claim rate. Even though claimants of industrial insurance are employed, the unemployment rate was significantly related to the claim rate in the 3 years studied. Our interpretation is that disability is a symptom of distress. Where there is a rise in job insecurity and an attendant rise in economic insecurity, there is a greater likelihood that back pain will become disabling.

Back Pain↗