Pressure studies in the moving knee.
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Biomedical subjects
Publications and source records attributed to M I Jayson.
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Mobilization and manipulation have been compared with placebo physiotherapy in patients with nonspecific back pain. Studies were conducted on 94 patients seen in general practice and 94 referred to hospital rheumatology and orthopaedic clinics for a specialist opinion. Assessments were performed immediately after the treatment course, two months later, and at one year. Most patients in both series showed improvements. In the general practitioner series, there was a slight but definite advantage in favor of those receiving mobilization and manipulation immediately after the course of treatment. However, these differences had largely disappeared at three months, and at one year the two groups were identifical. Analysis of the data indicated that clinical improvement correlated with the shorter length of history. No such advantage in favor of mobilization and manipulation was found in the hospital series. It is believed that this is because the hospital patients all had a longer duration of symptoms and a number of other features that were identified as being significantly worse. This study indicates the high rate of spontaneous resolution of low-back pain. In patients likely to improve anyway, mobilization and manipulation may hasten improvements but do not affect the long-term prognosis.
Fifteen subjective variables reflecting the severity of back pain, the circumstances exacerbating symptoms, and the impact of the problem on life style were scored on Visual Analogue Scales. It was possible to combine the results from these assessments to provide a global subjective index. Repeated measurements by the same observer showed a high degree of reproducibility, but when performed by separate observers discrepancies arose in certain questions. By improving certain questions and standardizing their presentation to the patient, a considerable improvement in the correlation of results between observers was obtained. Objective assessments of spinal motion and straight leg raising and a global objective index showed a high degree of intraobserver reproducibility. This technique was applied to a study of relief of back pain by lumbar corsets when it was found that there was significantly greater relief of back pain by a corset with a lumbar support than one without a spinal support. We conclude that the emphasis in assessing the progress of the back-pain patient must be on the subjective parameters, and the technique developed offers a useful method for reliably assessing patients and following their progress.
OBJECTIVE: To examine digital microvascular responses in patients with primary Raynaud's phenomenon (PRP) and systemic sclerosis (SSc), and compare these to the responses in healthy control subjects. METHODS: Digital microvascular responses to repeated episodes of iontophoresis of acetylcholine chloride (endothelial-dependent), sodium nitroprusside (endothelial-independant) and adrenaline were measured using dual-channel laser Doppler in 8 healthy control subjects, 8 patients with PRP and 8 patients with SSc. RESULTS: There were no significant differences in responses between groups. For each chemical the greatest response was generally seen in period 7 of the protocol (after the third episode of iontophoresis). For acetylcholine chloride in period 7, the age and baseline adjusted ratio of the maximum response of PRP to control was 0.93, 95% CI (0.26, 3.38) and for SSc to control it was 0.60, 95% CI (0.13, 2.81). For sodium nitroprusside in period 7, this age and baseline adjusted ratio of the maximum response of PRP to control was 1.31, 95% CI (0.74, 2.32) and for SSc to control it was 1.35, 95% CI (0.68, 2.67). For adrenaline in period 7, the age and baseline adjusted ratio of PRP to control was 1.51, 95% CI (0.79, 2.89) and for SSc to control it was 2.18, 95% CI (1.01, 4.69). CONCLUSION: This study demonstrates the usefulness of iontophoresis of vasoactive chemicals, combined with laser Doppler blood flowmetry, in the non-invasive assessment of dermal microvascular responses. One possible explanation for the lack of difference in responses between groups is that vasoactive chemicals other than those discussed are important in the pathophysiology of primary and secondary Raynaud's phenomenon.
OBJECTIVE: Animal studies suggest that gold compounds impair haem synthesis and increase haem degradation and, as a result, reduce activity of the hepatic haemoproteins cytochromes P-450. The aim of this study was to investigate whether intramuscular gold exerts similar effects in patients with rheumatoid arthritis (RA). METHODS: Urinary porphyrin and precursor excretion, erythrocyte protoporphyrin, and antipyrine clearance, were measured in 6 patients with RA before and 10 weeks after commencement of intramuscular gold. RESULTS: Parameters of haem metabolism were unaffected by gold. While antipyrine clearance was not statistically changed after gold treatment, in 3 of the patients there was an average decrease in antipyrine clearance of 23%. CONCLUSION: Further studies examining RA patients at different time points are required to investigate further the possibility of reduced hepatic drug metabolising activity during prolonged treatment with gold.
OBJECTIVE: To evaluate the effects of a combination of micronutrient antioxidants (selenium, beta-carotene, vitamin C, vitamin E and methionine) with allopurinol in patients with limited cutaneous systemic sclerosis (SSc). METHODS: The study was designed as a placebo-controlled double-blind crossover study. A carryover effect was detected retrospectively for some of the prescribed antioxidants, and so the data were analysed as: (a) a between group comparison of the first 10 week treatment period; and (b) a within group comparison of the first and second 10-week periods in those who received placebo treatment first. Study end-points were plasma von Willebrand factor (vWF), thermographic response to a standard cold challenge, frequency and duration of Raynaud's attacks, patient opinion, and specialised biochemical parameters (fatty acid profiles, antioxidants and markers of free radical injury). RESULTS: Thirty-three patients were recruited. The median duration of Raynaud's phenomenon was 10 years (range 2 to 50 years) in the active-first group and 10 years (range 4 to 53 years) in the placebo-first group. In the 10-week study, there were no differences between the active and placebo groups in the change from baseline for vWF, for the parameters of the rewarming curve, or for patients' symptoms. Despite a rise in circulating antioxidant levels, there was no fall in markers of free radical mediated injury. In the 20-week cross-over study, patients did not experience any clinical benefit from active treatment compared to placebo. CONCLUSION: No clinical benefit could be demonstrated from active treatment. There are several possible explanations for this negative result, including the short duration of therapy. It is possible that antioxidant therapy, to be effective, needs to be given early in the SSc disease process, before the onset of irreversible tissue damage.