Non-steroidal anti-inflammatory drugs--changes in prescribing may be warranted.
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Anti-Inflammatory Agents, Non-Steroidal↗
Biomedical subjects
R Madhok
Publications and source records attributed to R Madhok.
Rehabilitation for distal radial fractures in adults.
BACKGROUND: Fracture of the distal radius is a common clinical problem, particularly in older white women with osteoporosis. OBJECTIVES: To examine the effects of rehabilitation interventions in adults with conservatively or surgically treated distal radial fractures. SEARCH STRATEGY: We searched the Cochrane Bone, Joint and Muscle Trauma Group Specialised Register (December 2005), the Cochrane Central Register of Controlled Trials (The Cochrane Library Issue 4, 2005), MEDLINE, EMBASE, CINAHL, AMED, PEDro, OTseeker and other databases, conference proceedings and reference lists of articles. No language restrictions were applied. SELECTION CRITERIA: Randomised or quasi-randomised controlled trials evaluating rehabilitation as part of the management of fractures of the distal radius sustained by adults. Rehabilitation interventions such as active and passive mobilisation exercises, and training for activities of daily living, could be used on their own or in combination, and be applied in various ways by various clinicians. DATA COLLECTION AND ANALYSIS: The authors independently selected and reviewed trials. Study authors were contacted for additional information. No data pooling was done. MAIN RESULTS: Fifteen trials, involving 746 mainly female and older patients, were included. Initial treatment was conservative, involving plaster cast immobilisation, in all but 27 participants whose fractures were fixed surgically. Though some trials were well conducted, others were methodologically compromised. For interventions started during immobilisation, there was weak evidence of improved hand function for hand therapy in the days after plaster cast removal, with some beneficial effects continuing one month later (one trial). There was weak evidence of improved hand function in the short term, but not in the longer term (three months), for early occupational therapy (one trial), and of a lack of differences in outcome between supervised and unsupervised exercises (one trial). For interventions started post-immobilisation, there was weak evidence of a lack of clinically significant differences in outcome in patients receiving formal rehabilitation therapy (four trials), passive mobilisation (two trials), ice or pulsed electromagnetic field (one trial), or whirlpool immersion (one trial) compared with no intervention. There was weak evidence of a short-term benefit of continuous passive motion (post external fixation) (one trial), intermittent pneumatic compression (one trial) and ultrasound (one trial). There was weak evidence of better short-term hand function in participants given physiotherapy than in those given instructions for home exercises by a surgeon (one trial). AUTHORS' CONCLUSIONS: The available evidence from randomised controlled trials is insufficient to establish the relative effectiveness of the various interventions used in the rehabilitation of adults with fractures of the distal radius.
Adult↗
Disease association of two distinct interleukin-18 promoter polymorphisms in Caucasian rheumatoid arthritis patients.
Interleukin (IL)-18 is an important mediator of innate and adaptive immunity. We searched for an association of IL-18 promoter single-nucleotide polymorphisms (SNP) with rheumatoid arthritis (RA) in Caucasians. The entire study population was composed of two independent cohorts from Germany (n=200) and Scotland (n=410). Presence of IL-18 SNP at positions -607 and -137 was determined by allele-specific PCR in 327 RA patients and 283 healthy donors (HD). Diplotype distributions of both loci were in Hardy-Weinberg equilibrium (HWE) in the German and Scottish HD cohorts. In contrast, locus -607 was in HW disequilibrium in German, and locus -137 in Scottish RA patients. Diplotypic exact chi(2) tests suggested that -607CC was overrepresented in German, and -137CC in Scottish RA patients, but conservative chi(2) trend analyses could not prove any significant disease association of these single loci. SNP -607 and -137 were in strong linkage disequilibrium. The -607C(*)-137C haplotype was more prevalent in German RA (3.2 vs 1.2%) and in Scottish RA patients (4.1 vs 0.9%) than in the respective HD cohorts. These observations suggest that SNP of both positions contribute to the genetic background of RA pathogenesis.
Arthritis, Rheumatoid↗
Neuropathies in the rheumatoid patient: a case of the heavy hand.
Rheumatoid Arthritis (RA) is a common inflammatory arthritis' with pain and loss of function among its most disabling symptoms. These are mostly secondary to inflammation or mechanical damage to the joints. However it is also important to consider disease complications as a cause of symptoms, especially when the response to treatment is suboptimal. We report an RA patient whose symptoms were resistant to standard therapy, and were actually due to peripheral neuropathy.
Amines↗
Tacrolimus therapy in rheumatoid arthritis.
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Arthritis, Rheumatoid↗
Lack of radiological and clinical benefit over two years of low dose prednisolone for rheumatoid arthritis: results of a randomised controlled trial.
BACKGROUND: Evidence for disease modifying activity of low dose corticosteroid treatment in rheumatoid arthritis is contradictory. Studies showing radiological benefit suggest that continued treatment is required to sustain the effect. OBJECTIVE: To evaluate the effect of low dose oral prednisolone in early rheumatoid arthritis on disease activity over two years. DESIGN: Double blind placebo controlled trial. METHODS: Patients with rheumatoid arthritis, duration <3 years (n = 167), were started on a disease modifying antirheumatic drug (DMARD; sulphasalazine) and allocated by stratified randomisation to prednisolone 7 mg/day or placebo. Primary outcome measure was radiological damage, assessed by the modified Sharp method. Clinical benefit was a secondary outcome. A proactive approach to identifying and treating corticosteroid adverse events was adopted. Patients who discontinued sulphasalazine were offered an alternative DMARD. RESULTS: 90 of 257 patients eligible for the study refused to participate (more women than men). Of those enrolled, 84% were seropositive for rheumatoid factor, median age 56 years, median disease duration 12 months, female to male ratio 1.8:1. Prednisolone was given to 84 patients; of these 73% continued prednisolone and 70% sulphasalazine at 2 years. Of the 83 patients on placebo, 80% continued placebo and 64% sulphasalazine at 2 years. There were no significant differences in radiological score or clinical and laboratory measures at 0 and 2 years. CONCLUSIONS: Low dose prednisolone conferred no radiological or clinical benefit on patients maintained on a DMARD over two years. Low dose corticosteroids have no role in the routine management of rheumatoid arthritis treated with conventional disease modifying drugs.
Adult↗
An unusual case of "giant cell arteritis".
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Diagnosis, Differential↗
Analysis of the 5' flanking region of the interleukin 10 gene in patients with systemic sclerosis.
OBJECTIVES: Fibrosis, a feature of systemic sclerosis (SSc), is more severe in the diffuse compared with the limited disease variant. Interleukin 10 (IL-10) is an anti-inflammatory cytokine which reduces type 1 collagen mRNA levels in human fibroblasts. The 5' flanking region of the IL-10 gene is highly polymorphic, with three single base pair substitutions at position -1082(G/A), -819(C/T) and -592(C/A), which results in differential IL-10 production. The GCC/GCC genotype is associated with high IL-10 production while the ATA/ATA genotype with low production. We postulated that there would be a difference in IL-10 polymorphisms in patients with limited (lSSc) and diffuse (dSSc) disease. METHODS: Patients with limited (lSSc, n = 89) or diffuse (dSSc, n = 51) disease plus controls (n = 94) were recruited. DNA was isolated from peripheral blood and polymorphisms analysed using amplification refractory mutation system (ARMS) polymerase chain reaction (PCR). RESULTS: dSSc patients were less likely to carry the genotype indicative of high IL-10 production when compared with controls (controls vs dSSc; 29 vs 4%, chi2 = 15.7, 5 df, P = 0.005) and lSSc patients (lSSc vs dSSc; 21 vs 4%, chi2 = 17.5, 5 df, P = 0.002). There was no difference between control and lSSc patients. While there was no difference between controls and lSSc haplotypes, the GCC haplotype distribution did differ significantly between controls and dSSc patients (controls vs dSSc; 54 vs 36%, chi2 = 11.2, 2 df, P = 0.001). A significant difference was also observed between lSSc and dSSc haplotype distribution (lSSc vs dSSc; 48 vs 36%, chi2 = 13.5, 2 df, P < 0.001). CONCLUSION: We demonstrate that IL-10 genotypes associated with high IL-10 production are under-represented in dSSc. This may have implications in the disease pathology.
DNA↗
Closed reduction methods for treating distal radial fractures in adults.
BACKGROUND: Fracture of the distal radius is a common clinical problem, particularly in older white women with osteoporosis. Displaced fractures are usually reduced using closed reduction methods, which are non-surgical and generally comprise traction and manipulation, and the resulting position stabilised by external means, typically plaster cast immobilisation. OBJECTIVES: To examine the evidence for the relative effectiveness of different methods of closed reduction for displaced fractures of the distal radius in adults. SEARCH STRATEGY: We searched the Cochrane Musculoskeletal Injuries Group specialised register (to July 2002), the Cochrane Controlled Trials Register (The Cochrane Library, Issue 3, 2002), MEDLINE (1966 to July week 4 2002), EMBASE (1988 to 2002 week 31), CINAHL (1982 to June week 4 2002), the UK National Research Register (Issue 2, 2002) and reference lists of articles. We also handsearched the British Volume of the Journal of Bone and Joint Surgery supplements (1996 onwards), and abstracts of the American Orthopaedic Trauma Association annual meetings. SELECTION CRITERIA: Randomised or quasi-randomised clinical trials evaluating different methods of closed reduction. We also included trials in which the use (or not) of anaesthesia could be classed as a co-intervention. DATA COLLECTION AND ANALYSIS: All trials judged as fitting the selection criteria by both reviewers were independently assessed by both reviewers for methodological quality. Data were extracted independently by one reviewer and checked by the other. Quantitative data are presented using relative risks or mean differences together with 95 per cent confidence limits. No pooling was possible. MAIN RESULTS: Three trials involving a total of 404, mainly female and older, patients with displaced fractures of the distal radius were included. These failed to assess functional outcome, and only one trial reported on complications. One trial found no statistically significant differences between mechanical reduction using finger trap traction and manual reduction in anatomical outcomes. One trial compared a novel method of manual reduction where the non-anaesthetised patient actively provided counter-traction versus traditional manual reduction under intravenous regional anaesthesia. While patients of the novel method group suffered more, yet not intolerable, pain during the reduction procedure, the latter was shorter in duration. No differences in anatomical outcome were detected. The third study compared mechanical reduction involving a special device without anaesthesia versus manual reduction under haematoma block (local anaesthesia). Less pain during the reduction procedure was recorded for the mechanical traction group. Both methods yielded similar radiological results. Fewer patients in the mechanical traction group had signs of neurological impairment, mainly finger numbness, at five weeks but this difference was not statistically significant by one year. REVIEWER'S CONCLUSIONS: There was insufficient evidence from comparisons tested within randomised trials to establish the relative effectiveness of different methods of closed reduction used in the treatment of displaced fractures of the distal radius in adults. Given the many unresolved questions over the management of these fractures, we suggest an integrated programme of research, which includes consideration of reduction methods, is the way forward.
Adult↗
Inflammatory arthritis presenting as scrotal pain.
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Arthritis↗
Anaesthesia for treating distal radial fracture in adults.
BACKGROUND: Fracture of the distal radius is a common clinical problem, particularly in older white women with osteoporosis. Anaesthesia is usually provided during manipulation of displaced fractures or during surgical treatment. OBJECTIVES: To examine the evidence for the relative effectiveness of the main methods of anaesthesia (haematoma block, intravenous regional anaesthesia (IVRA), regional nerve blocks, sedation and general anaesthesia) as well as associated physical techniques and drug adjuncts used during the management of distal radial fractures in adults. SEARCH STRATEGY: We searched the Cochrane Musculoskeletal Injuries Group specialised register (January 2002), the Cochrane Controlled Trials Register (The Cochrane Library Issue 4, 2001), MEDLINE (1966 to October 2001), EMBASE (1988 to 2001 Week 48), Current Controlled Trials (December 2001) and reference lists of articles. SELECTION CRITERIA: Randomised or quasi-randomised clinical trials evaluating relevant interventions for these injuries (see Objectives). We excluded pharmacological trials comparing drug dosages and, with one exception, different drugs in the same class. Also excluded were trials reporting only pharmacokinetic and/or physiological outcomes. DATA COLLECTION AND ANALYSIS: All trials meeting the selection criteria were independently assessed by the three reviewers for methodological quality. Data were extracted independently by two reviewers. Quantitative data are presented using relative risks or mean differences together with 95 per cent confidence limits. Only very limited pooling of results from comparable trials was possible. MAIN RESULTS: The 18 included studies involved at least 1200, mainly female and older, patients with fractures of the distal radius. All studies had serious methodological limitations, notably in the frequent failure to assess clinically important and longer-term outcomes. Five trials provided evidence that, when compared with haematoma block, IVRA provided better analgesia during fracture manipulation and enabled better and easier reduction of the fracture, with some indication of a reduced risk of later redislocation or need for re-reduction. In contrast, haematoma block was quicker and easier to perform and less resource intensive. There was inadequate evidence of relative effectiveness of different methods of anaesthesia only examined within single trials: nerve block versus haematoma block; intravenous sedation versus haematoma block; general anaesthesia versus haematoma block; general anaesthesia versus sedation; and general anaesthesia versus haematoma block and sedation. None of the three trials evaluating three different physical aspects of anaesthesia (injection site of, or extra tourniquet, for IVRA; and technique for brachial plexus block) provided conclusive evidence for the effectiveness and safety of the novel technique. Six trials examined the use of drug adjuncts. The addition of two different muscle relaxants and one analgesic was tested for IVRA; one sedative and hyaluronidase for haematoma block; and clonidine for brachial plexus block. All trials evaluating adjuncts failed to provide evidence on eventual clinical outcome. A seriously flawed study comparing bupivacaine with prilocaine for IVRA gave some insight on the potential confounding effects of treatment by different doctors on patient outcome. REVIEWER'S CONCLUSIONS: There was insufficient robust evidence from randomised trials to establish the relative effectiveness of different methods of anaesthesia, different associated physical techniques or the use of drug adjuncts in the treatment of distal radial fractures. There is, however, some indication that haematoma block provides poorer analgesia than IVRA, and can compromise reduction. Given the many unresolved questions over the management of these fractures, we suggest an integrated programme of research, which includes consideration of anaesthesia options, is the way forward.
Aged↗
Rehabilitation for distal radial fractures in adults.
BACKGROUND: Fracture of the distal radius is a common clinical problem, particularly in older white women with osteoporosis. OBJECTIVES: To examine the evidence for effectiveness of rehabilitation intervention(s) for adults with conservatively or surgically treated distal radial fractures. SEARCH STRATEGY: We searched the Cochrane Musculoskeletal Injuries Group specialised register (January 2002), the Cochrane Controlled Trials Register (The Cochrane Library, Issue 4, 2001), the Cochrane Rehabilitation and Related Therapies Field database, MEDLINE (1966 to January 2002), EMBASE (1988 to 2001 Week 50), CINAHL (1982 to December Week 2 2001), Current Controlled Trials (December 2001), AMED, PEDro, conference proceedings and reference lists of articles. SELECTION CRITERIA: Randomised or quasi-randomised clinical trials evaluating rehabilitation as part of the management of fractures of the distal radius sustained by skeletally mature patients. Rehabilitation interventions such as active and passive mobilisation exercises, and training for activities of daily living, could be used on their own or in combination, and be applied in various ways by various clinicians. DATA COLLECTION AND ANALYSIS: All trials meeting the selection criteria were independently assessed by all three reviewers for methodological quality. Data were extracted independently by two reviewers. The trials were grouped into categories relating to the main comparisons, and to when the intervention(s) commenced (for example, during or after plaster cast immobilisation). Quantitative data are presented using relative risks or mean differences together with 95 per cent confidence limits. MAIN RESULTS: Twelve trials, involving 601 mainly female and older patients, were included. Initial treatment was conservative, involving plaster cast immobilisation, in all but 20 patients whose fractures were fixed surgically. Though some trials were well conducted, others were methodologically compromised. No trial provided definitive evidence. Only very limited pooling of results from comparable trials was possible. During immobilisation, there was weak evidence of improved hand function in the short term, but not in the longer term, for early occupational therapy (1 trial), and of a lack of differences in outcome between supervised and unsupervised exercises (1 trial). Post-immobilisation, there was weak evidence of a lack of clinically significant differences in outcome in patients receiving formal rehabilitation therapy (3 trials), passive mobilisation (2 trials) or whirlpool immersion (1 trial) compared with no intervention. There was weak evidence of a short-term benefit of continuous passive motion (post external fixation) (1 trial), intermittent pneumatic compression (1 trial) and ultrasound (1 trial). There was weak evidence of better short-term hand function in patients given physiotherapy than in those given instructions for home exercises by a surgeon (1 trial). REVIEWER'S CONCLUSIONS: The available evidence from randomised trials is insufficient to establish the relative effectiveness of the various interventions used in the rehabilitation of adults with fractures of the distal radius.
Adult↗
The use of the Internet as a resource for health information among patients attending a rheumatology clinic.
OBJECTIVES: To determine the proportion of patients attending a rheumatology clinic who have access to a computer with Internet capabilities, to establish how often they search for health information, and how difficult or useful they find this resource. METHODS: We performed a questionnaire-based study of consecutive patients attending a rheumatology clinic in two city teaching hospitals over a 1 week period. Patients were asked if they owned or had access to a computer with Internet capabilities, and if they had searched for information on shopping, holidays, entertainment or health information. Further questions were then directed at the nature of the health information, how useful it was and how easy the patient found it to access the details. Patient demographic data were obtained by case record review. RESULTS: One hundred and forty patients were approached; 138 completed questionnaires were collected. One hundred and one respondents (73%) were female. Median patient age was 58 yr (range 18-84). One hundred and seven (78%) had rheumatoid arthritis, with median disease duration of 8 yr (range 6 months to 49 yr). Sixty (43%) had access to the Internet, mostly at home, and used it most frequently for holiday information. Thirty-seven (27% of all respondents) reported that they had searched for medical information on a median of 2 (range 1-10) occasions in the previous 12 months. Of these, 83% perceived the information as useful, 54% discovered something they had not previously known and 31% reported it was easier than asking their doctor or nurse. Patients searched on-line for information on their arthritis (83%), drug treatment (54%), alternative therapies (31%), diet and arthritis (46%) and patient organizations (11%). No patients recalled being advised to search for information by their doctor or nurse. Patients who searched for medical information were younger (median age 48 vs 62 yr; P<0.001), more likely to be employed (32 vs 16%) and more likely to be married or in a stable relationship (84 vs 66%); there were no differences in sex distribution, diagnosis, disease duration or social deprivation. CONCLUSIONS: One in four patients attending our rheumatology clinic had searched the Internet for medical information in the last 12 months. Almost one-third found it easier than asking their health-care professional. Further studies are required to explore the wider application of this resource and to determine the validity and reliability of the information obtained.
Adolescent↗
Illiteracy in rheumatoid arthritis patients as determined by the Rapid Estimate of Adult Literacy in Medicine (REALM) score.
OBJECTIVES: To determine the prevalence of illiteracy in a cohort of rheumatoid arthritis (RA) patients and the impact of illiteracy on disease severity and function. METHODS: We performed a prospective cross-sectional study with case record review of 127 consecutive patients with RA attending one centre. All patients completed the Rapid Estimate of Adult Literacy in Medicine (REALM) screening test. This 66-word recognition test provides an estimate of reading level in less than 3 min. Demographic data were collected by interview and case record review. Function was assessed with the Health Assessment Questionnaire (HAQ) and depression with the Hospital Anxiety and Depression (HAD) scale, both sent prior to clinic attendance. Social deprivation was assessed with the Carstairs index. RESULTS: Four patients refused to participate. Of these, three stated they were unable to read. Ninety-seven women and 26 men agreed to be interviewed. All but two were Caucasian. Median age was 56 yr (range 19-77 yr) and median disease duration was 10 yr (range 1-60 yr). Median number of previous disease-modifying anti-rheumatic drugs (DMARDs) was two. Eighteen (15%) patients were functionally illiterate, with a REALM score of less than 60. Sex, age, disease duration and numbers of joint replacements and previous DMARDs were not influenced by illiteracy. Illiteracy led to more anxiety (P=0.011), but did not affect HAQ score (P>0.5). Illiteracy was more common in the deprived (P=0.0064). Illiterate patients had three times more hospital visits compared with age- and sex-matched RA controls over the previous 12 months. CONCLUSIONS: One in six of our patient population are illiterate and would struggle to cope with patient education materials and prescription labels. These patients had significantly more hospital visits but equal function, suggesting that additional resources be directed towards these individuals. The REALM test is quick and easy to administer and allows us to identify patients who may require more appropriate literature.
Adult↗
Can intervention modify adverse lifestyle variables in a rheumatoid population? Results of a pilot study.
BACKGROUND: Rheumatoid arthritis (RA) is associated with significant excess morbidity and mortality. Cardiovascular disease is the commonest cause of premature death in patients with RA. In recognition of this, blood pressure, weight, and smoking history are routinely ascertained in the clinic and appropriate advice and treatment started. AIMS: To ascertain if attending a specialist nurse, in addition to routine medical care, would increase the success in dealing with lifestyle variables in a cohort of patients with RA. METHODS: Twenty two consecutive patients starting treatment with the disease modifying antirheumatic drug (DMARD) sulfasalazine were invited to attend an additional clinic dealing with lifestyle factors every 12 weeks over a 48 week follow up. Smoking and alcohol history, baseline demographic and metrology assessments were determined for all patients. Body mass index (BMI) was calculated, blood pressure recorded, function assessed by the Health Assessment Questionnaire (HAQ), and social deprivation determined by the Carstairs Index. Patients were advised on exercise and diet, and serum cholesterol was measured. RESULTS: Twenty women and two men, with a mean age of 52 years and mean disease duration of five years, were enrolled. Eight patients smoked and, unfortunately, none were persuaded to discontinue. Fifteen of the cohort were already taking regular exercise; one additional patient began swimming regularly. At baseline, 10 patients were found to have a high cholesterol, with a mean of 6.8 mmol/l. A 14% reduction in mean cholesterol was achieved by dietary modification, and three patients merited statin treatment. Obesity is a major problem in our population and 15 of the patients had grade I obesity with a mean BMI of 30.6; five of these gained a further 4.5 kg. Six patients with previously untreated hypertension were identified, but unfortunately five remained hypertensive and only two had received anti-hypertensive drugs. CONCLUSIONS: Educating patients in order to change lifestyle habits and influence outcome is a long term challenge facing all healthcare workers. In our cohort, most adverse lifestyle factors had already been recognised and discussed by the general practitioner or at prior clinic visits. Additional advice and input led to only modest improvement.
Adult↗
Analysis of transforming growth factor beta1 gene polymorphisms in patients with systemic sclerosis.
OBJECTIVES: To determine the distribution of transforming growth factor beta1 (TGFbeta1) genotypes at codon 10 (+869 polymorphism) and codon 25 (+915 polymorphism) in patients with scleroderma (SSc). Differences between diffuse and limited SSc (dSSc and lSSc) were also investigated. METHODS: Patients with lSSc (n=89) and dSSc (n=63) were compared with 147 controls. DNA was isolated from peripheral blood and polymorphisms at codons 10 (C/T) and 25 (G/C) of the TGFbeta1 gene analysed by polymerase chain reaction and sequence specific oligonucleotide probing. RESULTS: Significantly more patients with SSc than controls carried allele C at codon 10 (controls v SSc, 38% v 48%, chi(2)=8.2, 1df, p=0.004), OR=1.95 (95% CI 1.16 to 3.27). The difference remained when patients with SSc were split into those with limited or diffuse disease, (controls v dSSc, chi(2)=5, 1df, p=0.02 and controls v lSSc, chi(2)=6, 1df, p=0.013). The patients with SSc had significantly more subjects heterozygous at codon 10 (controls v SSc, chi(2)=45, 1df, p<0.0001). Possession of allele C at codon 10 gave an OR=4.8 (95% CI 2.8 to 8.4). No difference in allele frequency was seen between patients with SSc and controls at codon 25. More patients with SSc than controls carried the GG genotype (controls v SSc, 80% v 88%, chi(2)=7, 2df, p=0.027). Possession of allele G gave an OR=1.7 (95% CI 0.5 to 5.9). There was no difference between diffuse and limited disease at either codon. CONCLUSIONS: These results suggest that patients with SSc are genetically predisposed to high TGFbeta1 production. These polymorphisms do not, however, explain the difference in the clinical phenotypes of limited and diffuse SSc.
Codon↗
The vibration of an artery-like tube conveying pulsatile fluid flow.
A hybrid method for investigating pulsatile fluid flow in a long, thin, artery-like tube subjected to external excitations is presented. The non-linear partial differential equations governing the motion of the system, which incorporate the influence of circumferential strains, are solved by a combination of a finite element method, a finite difference method and a method of characteristics with interpolation. An initially axially stretched elastic tube conveying pulsating fluid, simply supported at both ends, is modelled to assess the effect of external harmonic excitation on the dynamic responses of the tube and the fluid flow. The results agree well with new experimental data. Comparison of the predicted results with those of a decoupled model demonstrates that it is necessary to consider the mechanism of fluid-structure interaction fully in the study of initially stretched cylindrical tubes conveying pulsatile fluid flow. An analysis of these coupling effects is presented for Womersley numbers alpha = 2.81 and 3.97 and a mean flow Reynolds number Re = 875.
Aorta↗
Smoking cessation. Pulling out the stops.
The launch of smoking-cessation drug Zyban in June last year greatly increased demand on a local smoking-cessation service. It is important to use local media to increase awareness of local services. Health authorities and pharmaceutical companies should work with the media when new drugs may put extra strain on local services.
Bupropion↗