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Biomedical subjects

M H Liang

Publications and source records attributed to M H Liang.

At least 145 records · Page 8Linked to original sources

Advances in patient education in rheumatic disease.

Education of patients with arthritis began with an emphasis on conveying knowledge, grew to include behaviour change, compliance, and more general coping and management of disease and then progressed to consider physical and psychosocial health outcomes. Research continues in all these areas. Control, in many forms (locus of control, self perceived efficacy, learned helplessness), is now suggested to be a central mediating variable. Evaluation of programmes is moving away from programme v usual care towards comparison of alternative methods of delivery and matching of method to learner. The first generation of researchers in arthritis education tended to be care givers with little formal education in behavioural sciences and evaluation methodology; the programmes they designed were often empirically based. The current generation, nurtured in large part by funds from the Arthritis Foundation and the National Institutes of Health, is better trained in designing programmes grounded in behavioural sciences and educational theory. In the long run, collaborations with care givers and patients will considerably strengthen the effectiveness of education programmes for patients. A variety of educational strategies have been shown to change the knowledge, behaviour, and health of patients with arthritis for the better. Many methods seem to work, so long as the programme is planned, has a goal, and is accountable. There is much work still to be done to teach care givers to be better teachers, and patients to be better managers of their diseases, in concert with their doctors, and to focus on high risk groups. Although most work has been done with patients with rheumatoid arthritis and osteoarthritis, many of these findings can and should be safely generalised to less studied rheumatic diseases. Finally, we need to consider the patient first as a person, and to provide education through all avenues, not just the medical care system.

Arthritis↗

Validation of a surveillance case definition of carpal tunnel syndrome.

The National Institute for Occupational Safety and Health (NIOSH) has proposed a surveillance case definition for work-related carpal tunnel syndrome (CTS). The case definition requires the presence of median nerve symptoms; one or more occupational risk factors; and objective evidence of CTS including one of three physical examination findings or nerve conduction tests diagnostic of CTS. We evaluated the performance of the NIOSH case definition, restricting our analysis to cases in which physical examination findings served as the objective criterion. Nerve conduction studies were used as the gold standard. Seventy-eight workers were studied; 38 percent had CTS. The NIOSH case definition had sensitivity of 0.67 (95% CI = 0.57, 0.77), specificity of 0.58 (95% CI = 0.47, 0.69), and positive and negative predictive values of 0.50 (95% CI = 0.39, 0.61) and 0.74 (95% CI = 0.64, 0.84), respectively. Overall 38 percent of subjects were classified incorrectly. In a sample with a prevalence of 15 percent, as might be encountered in high risk workplaces, the positive predictive value would be 0.22. In conclusion, when physical examination findings serve as the objective criterion the performance of the case definition is modest reflecting the limited diagnostic value of its component tests and indicating that effective screening for CTS awaits improved diagnostic techniques.

Adult↗

Low dose prednisone does not affect calcium homeostasis or bone density in postmenopausal women with rheumatoid arthritis.

To assess whether low doses of prednisone produce generalized alterations in skeletal homeostasis in rheumatoid arthritis (RA), indices of calcium metabolism and bone mineral density (BMD) were measured in 22 women with RA treated without or with prednisone (6.6 mg daily). Ionized and total calcium concentrations, intact parathyroid hormone (PTH) and osteocalcin levels were comparable in the 2 groups. BMD measurements in the lumbar spine, and proximal femur sites including the femoral neck, Ward's triangle, and trochanteric region were not significantly different in patients with RA treated without or with prednisone. In our experience low dose prednisone did not adversely affect indices of mineral metabolism, or bone density in RA.

Adult↗

The outcome of decompressive laminectomy for degenerative lumbar stenosis.

The outcome of laminectomy for the relief of symptoms resulting from degenerative lumbar stenosis is not well established. Eighty-eight consecutive patients who had had a laminectomy for degenerative lumbar stenosis between 1983 and 1986 were studied. Eight of the patients had had a concomitant arthrodesis. The follow-up evaluation included a review of charts and standardized questionnaires that were completed by the patients. One year postoperatively, five patients (6 per cent) had had a second operation and five still had severe pain. By the time of the latest follow-up, in 1989, fifteen (17 per cent) of the original eighty-eight patients had had a repeat operation because of instability or stenosis; twenty-one (30 per cent) of the seventy patients who were evaluated by questionnaire in 1989 had severe pain. The factors found to be associated with a poor long-term outcome, defined as severe pain or the need for a repeat operation, or both, included co-existing illnesses (such as osteoarthrosis, cardiac disease, rheumatoid arthritis, or chronic pulmonary disease) (p = 0.004), the duration of follow-up (p = 0.01), and an initial laminectomy involving a single interspace (p = 0.04). We concluded that the long-term outcome of decompressive laminectomy is less favorable than has been previously reported, and that co-morbidity and a single-interspace laminectomy are risk factors for a poor outcome.

Aged↗

The carpal tunnel syndrome: diagnostic utility of the history and physical examination findings.

STUDY OBJECTIVE: To assess the value of a history and physical examination findings in diagnosing the carpal tunnel syndrome, and to determine whether constellations of clinical findings identify patients at high or low risk for the carpal tunnel syndrome. DESIGN: Comparison of diagnostic tests with neurophysiologic testing. SETTING: Patients with upper extremity complaints of diverse causes referred to a neurophysiology laboratory for diagnostic studies. METHODS: Before nerve conduction testing, a history, demographic and physical examination data, and a hand pain diagram were obtained from each patient. Diagrams were categorized as indicating the classic carpal tunnel syndrome, or as probable, possible, or unlikely to indicate the carpal tunnel syndrome. Associations between clinical data and nerve conduction results were examined in univariate and multivariate analyses. RESULTS: Of 110 patients in the study, 44 (40%) had the carpal tunnel syndrome. Individually, the best predictors were hand pain diagram rating (positive predictive value, 0.59; 95% CI, 0.48 to 0.68) and Tinel sign (positive predictive value, 0.55, CI, 0.45 to 0.65). The combination of a positive Tinel sign and a probable or classic diagram rating had a positive predictive value of 0.71; CI, 0.53 to 0.85. Other findings from physical examination and the history were less useful. Just 9% of patients under 40 years of age with possible or unlikely diagram ratings had the carpal tunnel syndrome. CONCLUSIONS: With the exceptions of age, Tinel sign, and hand pain diagram rating, findings from the physical examination and the history had limited diagnostic utility. Patients under 40 years of age with possible or unlikely diagram ratings were at low risk for the carpal tunnel syndrome. This finding, which should be confirmed in an independent population, suggests that subsets of patients may be managed without nerve conduction studies.

Adult↗

Exogenous sex hormones and the risk of rheumatoid arthritis.

The use of exogenous sex hormones in relation to the risk of rheumatoid arthritis (RA) was examined in a cohort of married nurses 30-55 years of age followed since 1976 in the Nurses' Health Study. Baseline information on the use of oral contraceptives, replacement estrogens, and other potential risk factors was obtained in 1976 and updated every 2 years. During 8 years of followup, 217 incident cases of polyarthritis were ascertained (115 RA and 102 undifferentiated polyarthritis). When compared with women who had never used oral contraceptives, the age-adjusted relative risk was 1.0 (95% confidence interval [CI] 0.7-1.3) for past users; however, too few women were currently using oral contraceptives for a reliable estimate of its effect. Among postmenopausal women, 123 cases of RA were reported. Compared with postmenopausal women who never used replacement estrogens, current users had an age-adjusted relative risk of 1.3 (95% CI 0.9-2.0), past users had an age-adjusted relative risk of 0.7 (95% CI 0.5-1.2), and ever users had a relative risk of 1.0 (95% CI 0.7-1.4). These data do not show a protective effect of past use of oral contraceptives or replacement estrogens for RA; however, a modest protective effect of current oral contraceptive use cannot be excluded.

Adult↗

Reproductive factors, smoking, and the risk for rheumatoid arthritis.

Risk factors for rheumatoid arthritis were examined in a cohort of 121,700 female nurses aged 30-55, followed in the Nurses' Health Study. Baseline information on reproductive variables, cigarette smoking, obesity, and other variables was obtained in 1976 and updated every 2 years. Cases of rheumatoid arthritis were defined by standardized questionnaire and review of medical records. During 883,187 person-years of follow-up, 217 new cases of rheumatoid arthritis were identified (115 had definite rheumatoid arthritis and 102 had "undifferentiated polyarthritis"). When compared with women who experienced menarche at age 13 years, the age-adjusted relative risk of rheumatoid arthritis among women with early menarche was 1.9 (95% confidence interval, 0.9-2.4). There were, however, no significant associations between parity, age at birth of the first child, menopause, or obesity and the incidence of rheumatoid arthritis. Cigarette smokers had a slight apparent increase in the risk of rheumatoid arthritis. Among current smokers, the age-adjusted relative risk for RA rheumatoid arthritis was 1.3 (0.9-2.1); among former smokers, the relative risk was 1.5 (0.9-2.3).

Adult↗

Comparisons of five health status instruments for orthopedic evaluation.

This study represents a long-term effort to find optimal techniques for evaluating outcome in patients who have undergone total joint arthroplasty. Sensitivity of five health status questionnaires was studied in a longitudinal evaluation of orthopedic surgery. The questionnaires (Arthritis Impact Measurement Scales [AIMS], Functional Status Index [FSI], Health Assessment Questionnaire [HAQ], Index of Well Being [IWB], and Sickness Impact Profile [SIP]) were administered to 38 patients with end-stage arthritis at three points in time: two weeks before hip or knee arthroplasty, and at three-month and 12- to 15-month follow-up. Response values (i.e., changes within patients) were calculated on four scales: global health, pain, mobility, and social function. By the three-month follow-up, most instruments detected large mean responses in global health, pain scores, and mobility. Smaller changes on these scales were found between three and 12 to 15 months. Social function showed small to modest gains at successive follow-ups. Standardized response means were calculated to assess sensitivity to detect change. Confidence intervals for these indices were constructed using a jackknife procedure, and significance tests were performed by pairing selected indices. Finally, the study projected sample sizes required to assess a new therapy, using each response. These statistical tools facilitated comparisons among instruments and may prove useful in other settings.

Aged↗

A modification of the Health Assessment Questionnaire for the spondyloarthropathies.

A functional status measure was developed by adding 5 items to the Health Assessment Questionnaire (HAQ-S), and compared to anthropometric measures of spinal mobility. Forty-four patients with spondylitis were evaluated by the HAQ-S and measures of spine flexibility (finger-to-floor, Smythe test, neck rotation, and chest expansion). Modification of the HAQ raised the mean difficulty score by 29% from 0.38 (SD = 0.49) to 0.49 (SD = 0.51), indicating increased ability to capture functional limitations. Neck rotation correlated most strongly with the HAQ-S score (r = -0.57), which suggests an important role for this measure in clinical management and followup of spondylitis.

Adult↗

A self-administered hand symptom diagram for the diagnosis and epidemiologic study of carpal tunnel syndrome.

Noninvasive tests for carpal tunnel syndrome (CTS) are of limited diagnostic value. A self-administered hand symptom diagram has been developed for use in the diagnosis and epidemiologic study of CTS. Diagrams are rated classic CTS, probable, possible or unlikely. Diagram ratings were compared with nerve conduction diagnoses in 110 patients with upper extremity complaints. A hand diagram rating of classic or probable CTS had sensitivity of 0.64, specificity of 0.73 and positive predictive value of 0.58. The negative predictive value of an unlikely diagram was 0.91. We conclude that the diagram is a useful diagnostic tool and may be valuable for occupational and population screening.

Carpal Tunnel Syndrome↗

Reliability and validity of six systems for the clinical assessment of disease activity in systemic lupus erythematosus.

Six systems for defining and evaluating disease activity in patients with systemic lupus erythematosus (SLE) (the Ropes system, the National Institutes of Health [NIH] system, the New York Hospital for Special Surgery system, the British Isles Lupus Assessment Group [BILAG] scale, the University of Toronto SLE Disease Activity Index [SLE-DAI], and the Systemic Lupus Activity Measure [SLAM]) were tested on 25 SLE patients who were selected to represent a range of disease activity. The patients were evaluated independently by 2 physicians on 2 occasions approximately 1 month apart. Differences between patients demonstrated the largest source of variation in scores, accounting for 56-84% of the total variance, depending on the instrument. Differences between physicians (i.e., error) showed the next largest variation, 11-28% of the total variance, and differences between visits made up 5-16% of the total. The BILAG, SLE-DAI, and SLAM had the best inter-visit and inter-rater reliability. Convergent validity was shown by the strong correlations of scores among the different instruments (r = 0.81-0.97). All instruments correlated highly with the physicians' clinical impression of disease but less well with their evaluation of disease severity. The number of American Rheumatism Association criteria for SLE that were met by the patients correlated poorly with the physicians' global evaluation and with the scores of the instruments. The patients' self-reported disease activity scores correlated highly with the physicians' assessments of disease activity (r = 0.85-0.91), and the mean values from self-reports and from physicians' assessments were nearly equal. In contrast, severity scores correlated less well between self-reports and physician assessments (r = 0.49-0.69), and mean self-reported severity values were lower than the means from physicians. The BILAG, SLE-DAI, and SLAM systems appear to have better psychometric properties than the others for clinical research.

Adult↗

Compliance and quality of life: confessions of a difficult patient.

Noncompliance has been treated as a deviant behavior. This paper argues that nonadherence is more complex and is the expression of independence and a judgment about the utility of any medical, surgical, or rehabilitation intervention. The quality of one's life is a personally defined concept and so too are the reasons why a patient refuses to do what is recommended. Appropriate health behavior should be thought of as a behavior that meets the person's goals and achieves some mutually definable outcome.

Aged↗

Sensitivity of anthropometric techniques for clinical trials in ankylosing spondylitis.

To determine whether anthropometric techniques widely used for assessment of ankylosing spondylitis (AS) would be useful outcome measures in long-term clinical trials, 52 AS patients at the Royal National Hospital for Rheumatic Diseases were studied. All patients had well documented AS with a mean age of 38.1 years, and had been diagnosed for an average of 7.6 years. Measurements were taken before (B) and after (A) 3-week intensive inpatient physical therapy (PT). Short-term therapeutic effects (over 3 weeks) were significant (adjusted p less than 0.0001) for all five measures tested (chest expansion, finger-to-floor distance, height, lumbar flexion, and cervical rotation). Height (adjusted p less than 0.0001), finger-to-floor distance (adjusted p = 0.047) and cervical rotation (adjusted p = 0.012) diminished over the course of follow-up. Therefore, 3 weeks of hospitalization with intensive physical therapy produces measurable short-term change; minute but measurable change with treatment occurs even in long-standing AS; and detectable changes in physical measurements occur over a 5-year period even in long-standing AS. Anthropometric measurements are useful outcome variables for long-term clinical trials in AS, but the potential for improvement in clinical measurements in long-standing AS is predictably small.

Adult↗

Effects of aerobic conditioning in lupus fatigue: a pilot study.

Fatigue, a complex symptom, significantly affects the quality of life in many patients with systemic lupus erythematosus (SLE). To understand this phenomenon, 23 patients with SLE and fatigue were studied. Standardized tests of depression (NIMH), fatigue, exercise tolerance (ETT) on a bicycle ergometer, and SLE activity were obtained. At baseline, SLE patients had significantly lower maximum oxygen consumption (VO2 max) than normals (p less than 0.005). Adjusted for age and sex, SLE patients perform at 54% of their expected maximum VO2, which is similar to published data from patients with rheumatoid arthritis. Depression by NIMH was not correlated with VO2 max or length of time on ETT. Fatigue measured by Profile of Mood States (POMS) was correlated with ETT time (r = 0.476, p less than 0.025) and with VO2 max (r = -0.402, p less than 0.07). After an 8-week aerobic conditioning programme the experimental group increased their aerobic capacity by 19% in contrast to 8% in controls. This change correlated with decreased fatigue as measured by visual analogue scales. Exercise did not exacerbate disease, and only two of 16 experimental subjects experienced transient joint symptoms during exercise.

Adult↗

Oral contraceptives and the risk of rheumatoid arthritis: a meta-analysis of a conflicting literature.

Since an original report suggesting a protective effect of oral contraceptives on rheumatoid arthritis incidence, 12 studies from four countries have shown conflicting results. Using the method of DerSimonian and Laird all available studies (including two completed but not as yet published) were evaluated. Overall, the relative risk of oral contraceptive use on the development of RA were less than unity. When summary statistics for case-control studies were examined, a small protective effect was noted, but was not statistically significant.

Arthritis, Rheumatoid↗

Delirium after elective orthopedic surgery: risk factors and natural history.

Forty-six orthopedic patients were studied to determine the incidence, natural history, and risk factors associated with post-operative delirium. Pre-operatively, patients were given a neuropsychological screening evaluation, the Mood Adjective Checklist (MACL), the Zung Depression Scale, the Anxiety Inventory Scale, and the Health Assessment Questionnaire (HAQ). A psychiatrist interviewed each patient on post-op day four for evidence of delirium as defined by DSM III criteria. Of the patients studied, thirteen (26%) were possibly or definitely delirious following surgery. Treatment with propranolol, scopolamine, or flurazepam (Dalmane) conferred a relative risk for delirium of 11.7 (p = 0.0028). Delirium was associated with increased post-operative complications (p = 0.01), poorer post-operative mood (p = 0.06), and an increase of about 1.5 days in length of stay (not significant). Delirious patients were significantly less likely than matched controls to improve in function at six months compared with a pre-operative baseline HAQ (t = 6.43, p less than 0.001).

Aged↗