Biomedical subjects

Murray Baron

Publications and source records attributed to Murray Baron.

12 recordsLinked to original sources

PubMed2007

Development of the McGill Range of Motion Index.

We created the McGill Range of Motion Index (McROMI) to allow us to ascribe a score to global limited range of motion (ROM) in patients with polyarthritis. Our goal was to have an easy-to-use index that required only visual estimation of ROM and could be performed by allied health professionals with limited training. The index was created with a range of motion ranking technique involving rheumatologists at McGill University and its validity was tested in patients with early inflammatory arthritis in the McGill Early Arthritis Registry. We hypothesized a valid index would correlate with various process and outcome measures. We found correlations between the McROMI and function (Health Assessment Questionnaire), Health Related Quality of Life (SF-36), pain, a global assessment of inflammatory disease activity (DAS28), and the number of tender and swollen joints. The McROMI demonstrates good validity as a measure of ROM in early inflammatory arthritis. It will prove useful in future research as a means of controlling for ROM as a confounder of various outcomes and in studies of therapeutic maneuvers to improve ROM.

Arthritis↗

PubMed2006

Office capillaroscopy in systemic sclerosis.

The aims of this study are to assess the reliability of two office techniques, the ophthalmoscope and the Dermlite dermatoscope, and to detect nailfold capillaroscopy abnormalities in systemic sclerosis (SSc). Two separate studies were performed. In the first, the nailfolds of two fingers on one hand of 13 SSc patients and two normals were examined by four rheumatologists using an ophthalmoscope. In the second, the nailfolds of the two fingers of each hand of six SSc patients and two normals were examined by six rheumatologists with a Dermlite dermatoscope. Widefield capillary microscopy was performed by one observer in the ophthalmoscope study to assess validity. The examiners determined the presence or absence of dilated loops, giant capillary loops, and/or avascular areas on each digit. The kappa coefficient was calculated to demonstrate agreement. With the ophtalmoscope, the inter-observer kappa coefficients were 0.43, 0.54, and 0.19; the average intra-observer agreements were 0.61, 0.56, and 0.31; and the ophthalmoscope-microscope agreement were 0.63, 0.52, and <0.1 for dilated capillaries, giant capillaries, and avascular areas, respectively. With the dermatoscope, the kappa values for inter-observer reliability were 0.63, 0.40, and 0.20; and intra-observer reliability was 0.71, 0.55, and 0.40 for dilated capillaries, giant capillaries, and avascular areas, respectively. The ophthalmoscope and the dermatoscope provide moderate to substantial reliability to detect the presence of giant and dilated capillaries but poor inter-observer agreement for avascular areas. The ophthalmoscope is valid when compared to the microscope for detecting giant or dilated capillaries. We conclude that these techniques are useful office tools to detect capillary abnormalities in SSc.

Dermoscopy↗

PubMed2006

Tender point examination in women with vulvar vestibulitis syndrome.

OBJECTIVES: To examine whether generalized pain sensitivity in women with vulvar vestibulitis syndrome (VVS) is increased, suggestive of altered pain processing at the level of the central nervous system, and to investigate pain history and other pain measures in women with VVS. METHODS: Sixteen women with VVS and 16 age-matched (+/-3 years) and oral contraceptive status-matched (yes or no) control women participated in this cross-sectional study. The TP examination, typically used in the diagnosis of FMS, consists of the palpation of 9 bilateral nonvulvar areas by a blinded rheumatologist and was the main measure of generalized sensitivity. Pain intensity and unpleasantness rating (0 to 10) were recorded after each palpation. In addition, nonvulvar pain history, pain interference, catastrophizing, and anxiety were assessed via questionnaires. RESULTS: Women with VVS had significantly more painful TPs than nonaffected women; they reported significantly higher pain intensity and unpleasantness ratings and displayed more pain behaviors than controls (P<0.05). Furthermore, VVS patients reported having experienced more pain problems and associated interference, they catastrophized more in response to vulvar and nonvulvar pain, and they had higher levels of trait anxiety than controls (P<0.05). DISCUSSION: These results are consistent with recent findings of generalized sensitivity and heightened responses to pain in women with VVS. These results suggest that the mechanisms involved in VVS may include those that are genital specific in addition to those that are more generalized, and possibly centrally mediated.

Adult↗

PubMed2006

Predictors of health status in women with fibromyalgia: a prospective study.

Although cross-sectional studies have identified correlates of dysfunction in fibromyalgia (FM) patients (e.g., psychological distress and pain), predictors of health status have not been previously investigated using a longitudinal research design. We gathered data from 156 women who met American College of Rheumatology criteria for primary FM recruited from both tertiary care and community settings. Stepwise multiple linear regression analysis indicated that poorer health status (p < .0001) and more comorbidity (p = .0089) at baseline were predictors of poorer health status 6 months later. After controlling for these covariates, psychological distress contributed significantly to the model (p = .01). There was a trend indicating that palliative coping styles (i.e., self-care, energy conservation) altered the impact of pain on 6-month health status (p = .06). These findings highlight the need for multidisciplinary interventions that target psychological distress, coping, and comorbidity in patients with FM.

Adult↗

PubMed2006

Etiology-specific endothelin-1 clearance in human precapillary pulmonary hypertension.

STUDY OBJECTIVES: Endothelin (ET)-1 is a mediator of vascular remodeling seen in human pulmonary hypertension (PH), and it is normally cleared via endothelial ET-B receptors. Increased levels of ET-1 are found in precapillary PH, partly from increased synthesis. We hypothesized that the endothelial dysfunction and vascular remodeling seen in human precapillary PH would also reduce ET-1 clearance. DESIGN AND SETTING: Case series from a single institutional PH center. PATIENTS: Thirty-four patients with pulmonary arterial hypertension (PAH; idiopathic [IPAH], n = 19; connective tissue disease [CTD], n = 15) and 11 patients with chronic thromboembolic PH were studied. MEASUREMENTS AND RESULTS: Using indicator dilution methods, the first-pass extraction of radiolabeled ET-1 through the pulmonary circulation, and permeability surface (PS) area, an index of functional microvascular surface available for ET-1 clearance, were determined. Mean extraction for IPAH and thromboembolic PH groups was normal, but it was reduced in PAH from CTD; 69% of all patients studied had normal extraction. The mean PS product was reduced significantly for all three etiologies as compared to normal, but 58% of IPAH patients and 40% of CTD-related PAH patients had normal PS products. CONCLUSIONS: Receptor-mediated ET-1 extraction and functional vascular surface area for clearance vary between etiologies of PAH. However, contrary to our hypothesis, endothelial ET-B receptor-mediated extraction is preserved in many patients. The scientifically significant finding of our study is that high ET-1 levels seen in patients with PAH must be predominantly due to excess synthesis rather than reduced clearance. The finding that endothelial ET-B receptors are still present and functional in PAH may also be of relevance to the choice of selective vs nonselective ET receptor antagonists.

Cyclohexanones↗

PubMed2005

Prevalence of elevated pulmonary arterial pressures measured by echocardiography in a multicenter study of patients with systemic sclerosis.

OBJECTIVE: To estimate the prevalence of elevated pulmonary arterial pressures (PAP) as a correlate for pulmonary arterial hypertension (PAH) in patients with systemic sclerosis (SSc) in rheumatology centers in Canada. METHODS: During the one-year study period (June 2002-May 2003), charts of patients with SSc were reviewed to determine demographics, SSc characteristics, percentage of patients with a PAH diagnosis, and the site criteria for such diagnosis. Subjects with no PAH that had symptoms of dyspnea and/or fatigue were invited to undergo Doppler echocardiography to estimate their systolic PAP (sPAP). RESULTS: A total of 539 patients with SSc (age 56 yrs +/- 13 SD, 84% female, 41% with diffuse SSc, 58% limited SSc, SSc disease duration 9 yrs +/- 7 SD) at 8 rheumatology centers were reviewed. Twenty-three percent of patients were diagnosed with elevated sPAP based on the site diagnosis criteria (i.e., > 30 mm Hg or > 35 mm Hg). From the non-PAH, not recently screened patients that had symptoms of dyspnea or fatigue, a total of 89 patients underwent a Doppler echocardiograph; 40% had sPAP > 35 mm Hg. CONCLUSION: Elevated PAP are common in both limited and diffuse SSc disease, occurring in 21% of limited and 26% of diffuse SSc patients. During the screening most patients had mild PAP elevations that would require further assessments such as right heart catheterization to diagnose PAH where appropriate. A high index of suspicion is important and routine echocardiography in symptomatic patients may allow earlier diagnosis of PAH and intervention. The proportion of SSc patients with mild to moderate elevations of PAP who will develop significant PAH is unknown and longterm studies are needed to address the natural progression.

Adolescent↗

PubMed2005

Ibuprofen may abrogate the benefits of aspirin when used for secondary prevention of myocardial infarction.

OBJECTIVE: To determine whether patients taking aspirin for secondary prevention of myocardial infarction are at increased risk of recurrent disease when they take concomitant ibuprofen. METHODS: In this population based, retrospective cohort study using governmental databases, patients > or = 66 years of age, hospitalized for an index acute myocardial infarction (AMI) between January 1992 and March 1999 and taking ASA throughout the period of followup were identified. The main exposure was the concomitant use of ibuprofen and ASA after the index AMI. The outcome of interest was recurrent AMI. Subjects were followed to one year after the index AMI. RESULTS: A total of 18,503 patients met the study entry criteria. Of these, 372 patients were dispensed a prescription for ibuprofen (exposed) and 14,424 patients were not dispensed a prescription for any nonsteroidal antiinflammatory drug (NSAID) (unexposed). Patients dispensed prescriptions for any NSAID (n = 4079), naproxen (n = 1239), and diclofenac (n = 1474) were analyzed separately. There was a trend to an increase in the rate of recurrent AMI in patients taking ibuprofen and ASA compared to those taking ASA alone as the duration of exposure increased [hazard ratios for ever, > or = 30 days, and > or = 60 days exposed were 1.01 (95% CI 0.58-1.76), 1.13 (95% CI 0.54-2.39), and 1.83 (95% CI 0.76-4.42), respectively]. In contrast, subjects taking prolonged naproxen and ASA had a trend toward a lower rate of recurrent AMI compared to those taking ASA alone. CONCLUSION: The results are consistent with data that suggest that regular, but not intermittent, ibuprofen may abrogate the benefits of aspirin when used for the secondary prevention of AMI. There may be differences in the risk of heart disease with various NSAID.

Aged↗

PubMed2005

Static wrist splint use in the performance of daily activities by individuals with rheumatoid arthritis.

OBJECTIVE: In individuals with rheumatoid arthritis (RA), to identify the influence of wrist splint wear on pain, work performance, endurance, perceived task difficulty, and perceived splint benefit while performing various upper limb tasks. METHODS: This crossover study included 30 individuals with wrist involvement. Pain, work performance, endurance, and perceived task difficulty were assessed with the splint on and off. Using a work simulator, participants performed 14 tasks, 10 assessing work performance and 4 assessing endurance. A visual analog scale (VAS) was used to rate pain, task difficulty, and perceived splint benefit. RESULTS: With the splint on, pain was significantly lower in 5 tasks, as was perceived difficulty in task performance. Work performance did not differ significantly with the splint on versus off. While mean endurance scores were always better with the splint on, differences reached significance on only one task. The task with greatest overall perceived splint benefit was "chopping with a knife." CONCLUSION: Results revealed that for most tasks, there was generally a positive effect of splint use on hand function; however, perceived splint benefit was marginal. For most tasks splint use improved or did not change pain levels, did not interfere with work performance, increased or maintained endurance, and did not increase perceived task difficulty. The findings suggest that wrist splint prescription is not a simple process; clinicians and clients need to work together to determine the daily wear pattern that maximizes benefit and minimizes inconvenience according to the client's individual needs.

Activities of Daily Living↗

PubMed2004

Shoulder hemarthrosis due to a bleeding pseudoaneurysm.

We describe a patient with advanced shoulder osteoarthritis who developed a spontaneous hemarthrosis due to a bleeding pseudoaneurysm. This rare cause of intra-articular hemorrhage is important to establish because specific treatment may offer relief and prevent further bleeding.

Aged↗

PubMed2004

Embolic complications of a mitral valve rheumatoid nodule.

We describe a patient with a rheumatoid nodule on the mitral valve who developed embolic phenomena from an overlying thrombus. It is important to recognize that thrombus can develop on intracardiac rheumatoid nodules and that these patients may require anticoagulation.

Aged↗

PubMed2004

Health services costs and their determinants in women with fibromyalgia.

OBJECTIVE: Patients with fibromyalgia (FM) use health services extensively. Knowledge about costs of FM is limited because of non-inclusiveness in assessing direct costs, because attempts to assess indirect costs are largely absent, and because determinants of costs have yet to be identified. We investigated the 6-month costs (direct and indirect) in women with primary FM, and we identified determinants of direct costs. METHODS: Subjects (n = 180 women) completed a health resource questionnaire as well as measures of pain, psychological distress, comorbidity, and disability. Unit costs for resources were obtained from government, hospital, laboratory, and professional association sources. Regression modeling for 6-month direct cost included age, disability, comorbidity, pain intensity, psychological distress, education, and work status. RESULTS: The average 6-month direct cost was $CDN 2298 (SD 2303). The largest components were medications ($CDN 758; SD 654), complementary and alternative medicine (CAM; $CDN 398; SD 776), and diagnostic tests ($CDN 356; SD 580). Our most conservative estimate of average 6-month indirect cost was $CDN 5035 (SD 7439). Comorbidity and FM disability were statistically significant contributors to direct costs in the multivariate analysis. Costs increased by approximately 20% with each additional comorbid condition. CONCLUSION: Women with FM are high consumers of both conventional and CAM services. Our estimates of costs exceed those from most other studies; this may be due to our inclusion of a broader set of health services, medications, and indirect costs. Although in univariate analyses the number of comorbidities and indices of the effect of FM, psychological distress, and pain intensity were associated with higher direct cost, in a multiple regression analysis, only the measure of FM disability and the number of comorbidities were significant direct-cost determinants. FM also imposes important indirect costs, which were nearly 70% of the economic burden.

Adult↗

PubMed2003

Patient-physician discordance in fibromyalgia.

OBJECTIVE: Discordance between patients' and physicians' health perceptions and satisfaction with the office visit in fibromyalgia (FM) has not been examined. We investigated this phenomenon to identify demographic, clinical, and psychosocial factors associated with patient-physician discordance on physical functioning, well being, and satisfaction with the office visit. METHODS: A sample of 182 women were examined by a rheumatologist to confirm the FM diagnosis. Patients and physicians independently completed the Patient-Physician Discordance Scale to assess perceptions of health and satisfaction with the office visit. Patients also completed questionnaires pertaining to sociodemographics, social support, disability, perceived stress, and psychological distress following the office visit. Separate generalized estimating equations with forward selection, controlling for the possible dependence of outcomes among patients of same physician, were modeled for each measure of discordance. RESULTS: The highest discordance score was on satisfaction with the office visit; physicians systematically underestimated patients' level of satisfaction. Higher levels of satisfaction with social support (p < 0.02) and more psychological distress (p < 0.03) were marginally associated with greater discordance on physical functioning. Higher levels of satisfaction with social support (p < 0.003), younger age (p < 0.02), and lower disability (p < 0.03) were associated with greater discordance on well being. More sexual abuse (p < 0.01) was significantly associated with more discordance on satisfaction with the office visit. CONCLUSION: There is a gap between what patients with FM and rheumatologists examining them experience during the office visit. Psychosocial factors contribute to our understanding of discordance on physical functioning, well being, and satisfaction.

Activities of Daily Living↗