The development and first validation of the Manchester Early Morning Symptoms Index (MEMSI) for patients with COPD

AIM

Early morning symptoms (EMS) in people with COPD are associated with poor health, impaired activities and increased exacerbation risk. We describe the development and preliminary validation of the Manchester Early Morning Symptom Index (MEMSI) to quantify EMS in COPD.

METHODS

Focus groups and cognitive debriefing with patients with COPD were used to develop the potential item list, followed by a cross-sectional study to finalise the items for inclusion. In addition to test-retest reliability, comparisons with the St George's Respiratory Questionnaire-C (SGRQ-C), modified Medical Research Council Dyspnoea Scale, Functional Assessment of Chronic Illness Therapy Fatigue Scale (FACIT-F) and Hospital Anxiety and Depression Scale (HADS) evaluated construct validity. Hierarchical methods informed item deletion and Rasch analysis was applied to assess scale unidimensionality.

RESULTS

23 items were identified from the focus groups and debriefings. The cross-sectional study involved 203 patients with COPD (mean age 64.7 SD 7.5 years, male 63%, Global Initiative for Chronic Obstructive Lung Disease (GOLD): 1:14% 2:41% 3:25% 4: 7%). 13 items were removed during item reduction. MEMSI contains 10 items, demonstrates good overall fit to the Rasch model (χ(2) p=0.26) and item score distribution; excellent reliability (Person Separation Index: 0.91) and good test-retest repeatability (r=0.82). It correlates with the SGRQ-C (r=0.73), FACIT-F (r=-0.65) and HADS (r=0.53-0.54) indicating good construct validity.

CONCLUSIONS

MEMSI is a reliable and valid unidimensional measure of EMS for patients with COPD. It is simple to use and score supporting its suitability for research and clinical use. Work is underway to determine the minimal clinical important difference and cross-cultural validity.

Systematic literature review of patient-reported outcome measures used in assessment and measurement of sleep disorders in chronic obstructive pulmonary disease

BACKGROUND

Sleep problems are common in patients with chronic obstructive pulmonary disease (COPD), but the validity of patient-reported outcome measures (PROMs) that measure sleep dysfunction has not been evaluated. We have reviewed the literature to identify disease-specific and non-disease-specific sleep PROMs that have been validated for use in COPD patients. The review also examined the psychometric properties of identified sleep outcome measures and extracted point and variability estimates of sleep instruments used in COPD studies.

METHODS

The online EMBASE, MEDLINE, PsycINFO, and SCOPUS databases for all years to May 2014 were used to source articles for the review. The review was performed according to Preferred Reporting Items for Systematic Reviews and Meta-Analyses guidelines. Criteria from the Medical Outcomes Trust Scientific Advisory Committee guidelines were used to evaluate the psychometric properties of all sleep PROMs identified.

RESULTS

One COPD-specific and six non-COPD-specific sleep outcome measures were identified and 44 papers met the review selection criteria. We only identified one instrument, the COPD and Asthma Sleep Impact Scale, which was developed specifically for use in COPD populations. Ninety percent of the identified studies used one of two non-disease-specific sleep scales, ie, the Pittsburgh Sleep Quality Index and/or the Epworth Sleep Scale, although neither has been tested for reliability or validity in people with COPD.

CONCLUSION

The results highlight a need for existing non-disease-specific instruments to be validated in COPD populations and also a need for new disease-specific measures to assess the impact of sleep problems in COPD.

Role of acupuncture in the management of diabetic painful neuropathy (DPN): a pilot RCT

AIMS

To examine the role of acupuncture in the treatment of diabetic painful neuropathy (DPN) using a single-blind, placebo-controlled RCT and to collect data that would be required in a future definitive study of the efficacy of acupuncture in DPN.

METHODS

45 patients were allocated to receive a 10-week course either of real (53%) or sham (47%) acupuncture. Five standardised acupuncture points on the lower limb of each leg were used in the study: LR3, KI3, SP6, SP10 and ST36. Outcome measures included the Leeds Assessment of Neuropathic Symptoms and Signs (LANSS) scale, lower limb pain (Visual Analogue Scale, VAS); Sleep Problem Scale (SPS); Measure Yourself Medical Outcome Profile (MYMOP); 36-item Short Form 36 Health Survey and resting blood pressure (BP).

RESULTS

Over the 10-week treatment period, small improvements were seen in VAS -15 (-26 to -3.5), MYMOP -0.89 (-1.4 to -0.3), SPS -2.5 (-4.2 to -0.82) and resting diastolic BP -5.2 (-10.4 to -0.14) in the true acupuncture group. In contrast, there was little change in those receiving sham acupuncture. A moderate treatment effect in favour of active acupuncture was detected in MYMOP scores -0.66 (-0.96 to -0.35) but non-significant effect sizes in LANSS Pain Scale -0.37 (-2.2 to 1.4), resting diastolic BP -0.50 (-3.0 to 1.99) and the SPS -0.51 (-2.2 to 1.16).

CONCLUSIONS

We have demonstrated the practicality and feasibility of acupuncture as an additional treatment for people with DPN. The treatment was well tolerated with no appreciable side effects. Larger randomised trials are needed to confirm the clinical and cost-effectiveness of acupuncture in the treatment of DPN.

TRIAL REGISTRATION NUMBER

ISRCTN number: 39740785.

A prospective study of risk factors for foot ulceration: the West of Ireland Diabetes Foot Study

BACKGROUND

This is the first study to examine risk factors for diabetic foot ulceration in Irish general practice.

AIM

To determine the prevalence of established risk factors for foot ulceration in a community-based cohort, and to explore the potential for estimated glomerular filtration rate (eGFR) to act as a novel risk factor.

DESIGN

A prospective observational study.

METHODS

Patients with diabetes attending 12 (of 17) invited general practices were invited for foot screening. Validated clinical tests were carried out at baseline to assess for vascular and sensory impairment and foot deformity. Ulcer incidence was ascertained by patient self-report and medical record. Patients were re-assessed 18 months later.

RESULTS

Of 828 invitees, 563 (68%) attended screening. On examination 23-25% had sensory dysfunction and 18-39% had evidence of vascular impairment. Using the Scottish Intercollegiate Guidelines Network risk stratification system we found the proportion at moderate and high risk of future ulceration to be 25% and 11%, respectively. At follow-up 16/383 patients (4.2%) developed a new foot ulcer (annual incidence rate of 2.6%). We observed an increasing probability of abnormal vascular and sensory test results (pedal pulse palpation, doppler waveform assessment, 10 g monofilament, vibration perception and neuropathy disability score) with declining eGFR levels. We were unable to show an independent association between new ulceration and reduced eGFR [Odds ratio 1.01; P = 0.64].

CONCLUSION

Our data show the extent of foot complications in a representative sample of diabetes patients in Ireland. Use of eGFR did not improve identification of patients at risk of foot ulceration.

Depression predicts first but not recurrent diabetic foot ulcers

AIMS/HYPOTHESIS

This study examined the relationship between symptoms of depression and the development of diabetic foot ulcers.

METHODS

Participants were 333 patients (71% male; mean age 62 years; 73% with type 2 diabetes) with diabetic peripheral neuropathy (DPN), but without peripheral vascular disease (PVD). Severity of DPN and the presence of PVD were assessed by clinical examination. Depression, other diabetes complications and foot self-care were assessed by self-report. Cox regression tested whether depression was an independent predictor of foot ulceration over 18 months, whether this relationship was moderated by foot ulcer history, and whether foot self-care mediated this relationship.

RESULTS

During follow-up, 63 patients developed a foot ulcer. Those with prior foot ulcers had more than four-fold greater risk of subsequent foot ulceration compared with those without a history of foot ulcer. A significant interaction effect showed that depression was significantly related to the development of first but not recurrent foot ulcers. This relationship was independent of biological risk factors. In the final model, each standard deviation increase in depression symptoms was significantly associated with increased risk of developing first foot ulcers (HR 1.68, 95% CI 1.20-2.35), while foot self-care was associated with lower risk (HR 0.61, 95% CI 0.40-0.94). Foot self-care did not mediate the relationship between depression and foot ulceration.

CONCLUSIONS/INTERPRETATION

These data suggest that depression is associated with increased risk of first foot ulcers in DPN patients and that this relationship is independent of biological risk factors and foot self-care. Interventions that target depression and foot self-care before the development of foot ulcers may maximise the likelihood of successful prevention of foot ulceration.

Predictors of depressive symptoms in persons with diabetic peripheral neuropathy: a longitudinal study

AIMS/HYPOTHESIS

The aim of the study was to determine whether diabetic peripheral neuropathy (DPN) is a risk factor for depressive symptoms and examine the potential mechanisms for this relationship.

METHODS

This longitudinal study (9 and 18 month follow-up) of 338 DPN patients (mean age 61 years; 71% male; 73% type 2 diabetes) examined the temporal relationships between DPN severity (mean +/- SD; neuropathy disability score [NDS], 7.4 +/- 2.2; mean vibration perception threshold, 41.5 +/- 9.5 V), DPN somatic experiences (symptoms and foot ulceration), DPN psychosocial consequences (restrictions in activities of daily living [ADL] and social self-perception) and the Hospital Anxiety and Depression subscale measuring depressive symptoms (HADS-D; mean 4.9 +/- 3.7).

RESULTS

Controlling for baseline HADS-D and demographic/disease variables, NDS at baseline significantly predicted increased HADS-D over 18 months. This association was mediated by baseline unsteadiness, which was significantly associated with increased HADS-D. Baseline ADL restrictions significantly predicted increased HADS-D and partly mediated the association between baseline unsteadiness and change in HADS-D. Increased pain, unsteadiness and ADL restrictions from baseline to 9 months each significantly predicted increased HADS-D over 18 months. Change in social self-perception from baseline to 9 months significantly predicted increased HADS-D and partly mediated the relationships of change in unsteadiness and ADL restrictions with change in HADS-D.

CONCLUSIONS/INTERPRETATION

These results confirm that neuropathy is a risk factor for depressive symptoms because it generates pain and unsteadiness. Unsteadiness is the symptom with the strongest association with depression, and is linked to depressive symptoms by perceptions of diminished self-worth as a result of inability to perform social roles.

Vibration perception threshold--a valuable assessment of neural dysfunction in people with diabetes

Diabetic peripheral neuropathy (DPN) has been identified as a key element in the causal pathway to foot ulceration and other lower-extremity complications, impaired quality of life and increased mortality. Early detection is essential to optimise effective risk management, including adequate foot care, patient education, and future pharmacological therapy. However, data suggest that screening has been mostly sub-optimal, and many physicians remain unfamiliar with non-invasive screening tests. There is evidence in the literature to suggest that vibration perception threshold (VPT) measures can be used to easily and accurately identify at-risk diabetic patients, including those with early neuropathic deficits. These measures have been used in population-based studies and are associated with an increased risk of severe and expensive outcomes, such as ulcers and amputations. Incorporating VPT testing into clinical practice has the potential to significantly improve the outcomes in patients with DPN, thereby substantially reducing the socio-economic burden of this common and challenging disease.

Foot ulcer risk is lower in South-Asian and african-Caribbean compared with European diabetic patients in the U.K.: the North-West diabetes foot care study

OBJECTIVE

To determine 1) foot ulcer rates for European, South-Asian, and African-Caribbean diabetic patients in the U.K and 2) the contribution of neuropathy and peripheral arterial disease (PAD) differences to altered ulcer risk between the groups.

RESEARCH DESIGN AND METHODS

In this U.K. population-based study, we screened 15,692 type 1 and type 2 diabetic patients in the community health care setting for foot ulcers, foot deformities, neuropathy, and PAD plus other characteristics. In total, 13,409 were European (85.5%), 1,866 were South Asian (11.9%), and 371 were African Caribbean (2.4%).

RESULTS

The age-adjusted prevalence of diabetic foot ulcers (past or present) for Europeans, South Asians, and African Caribbeans was 5.5, 1.8, and 2.7%, respectively (P < 0.0001). Asians and African Caribbeans had less neuropathy, PAD, and foot deformities than Europeans (P = 0.003). The unadjusted risk of ulcer (odds ratio [OR]) for Asians versus Europeans was 0.29 (95% CI 0.20-0.41) (P < 0.0001). PAD, neuropathy, foot deformities, and insulin use attenuated the age-adjusted OR from 0.32 to 0.52 (0.35-0.76) (P < 0.0001). African-Caribbean versus European ulcer risk in males was attenuated from 0.60 to 0.71 by vibration sensation.

CONCLUSIONS

South Asians with diabetes in the U.K. have about one-third the risk of foot ulcers of Europeans. The lower levels of PAD, neuropathy, insulin usage, and foot deformities of the Asians account for approximately half of this reduced foot ulcer risk. Lower neuropathy is the main contributor to the reduced African-Caribbean ulcer rate, particularly in men. The reasons for these ethnic differences warrant further investigation.

Efficacy of multilayered hosiery in reducing in-shoe plantar foot pressure in high-risk patients with diabetes

OBJECTIVE

High plantar pressure is an acknowledged risk factor in the development of plantar ulcers in the diabetic neuropathic foot. This study examines the ability of preventive foot care (PFC) socks to reduce plantar foot pressures in a sample of high-risk patients with diabetes.

RESEARCH DESIGN AND METHODS

Nineteen patients with established peripheral neuropathy attending a complications clinic of the Manchester Diabetes Centre were recruited to the study. Fifteen (78%) of the patients were male, 40-80 years of age, and ulcer-free at the time of recruitment. In-shoe plantar pressure measurements were recorded using the F-Scan and compared PFC socks with ordinary supermarket socks. The analysis measured differences in maximum foot contact area and plantar pressure for the whole foot, forefoot, and peak plantar pressure areas.

RESULTS

The results showed a significant increase in maximum foot contact area of 11 cm2 (95% CI 7-11) when subjects wore the PFC socks (P < 0.01). This was accompanied by 5.4 kPa (3.5-7.3) or 9% reduction in total foot pressure (P < 0.01). Similar results were observed at the forefoot, which showed a 14.2% increase in contact area and a 10.2% reduction in peak forefoot pressure.

CONCLUSIONS

These results suggest that the wearing of PFC socks increases the underfoot contact area and hence decreases plantar foot pressures. Further studies are required to determine whether the pressure and friction reductions achieved by this simple intervention would be effective in reducing the incidence of foot ulcers in high-risk patients.

The Cheshire Foot Pain and Disability Survey: a population survey assessing prevalence and associations

Previous foot studies have consistently reported high prevalence estimates in self-reported foot disorders. Few population studies, however, have attempted to assess the impact of foot problems in terms of pain and disability so that the burden associated with foot pain is unknown. A cross-sectional postal survey was conducted on a random community sample of 4780 individuals with 3417 (84%) responding. Subjects reporting foot pain in the past month, current pain and marking one item on the Manchester Foot Pain and Disability Index were classified as having disabling foot pain. Those with disabling foot pain and a random sample with no symptoms (matched for age and gender) received a follow-up interview and standardised foot examination. Self-reported nail problems, corns and callosities, swollen feet, foot deformities and recent foot injuries were found to be associated with disabling foot pain. Foot disability was also associated with pain in the shoulder, axial skeleton, hip/upper leg and knee along with other indicators of poor general health. Clinician diagnosed foot problems associated with disabling foot pain were swollen feet, knee and foot joint tenderness. Only 36% of persons with disabling foot pain received professional foot treatment in the 6 months preceding the survey. The results showed that 323/3417 (9.5%) reported symptoms of disabling foot pain and that this condition is likely to be multi-factorial in origin. Further work is necessary to understand more about the extent and type of unmet need and on how patients presenting with symptoms of disabling foot pain should best be managed.

The grading of hallux valgus. The Manchester Scale

This article describes a new, noninvasive method of assessing the severity of hallux valgus deformity by means of a set of standardized photographs. Six podiatrists were independently asked to grade the level of deformity of 13 subjects (26 feet) on a scale of 1 (no deformity) to 4 (severe deformity). The reliability of the four-point scale for the severity of hallux valgus was investigated by means of kappa-type statistics for more than two raters. The results showed that the grading method had excellent interobserver repeatability with a combined kappa-type statistic of 0.86, making it a suitable instrument for clinical and research purposes.

Development and validation of a questionnaire to assess disabling foot pain

This study outlines the design and validation of a new self-administered instrument for assessing foot pain and disability. The 19-item questionnaire was tested on 45 rheumatology patients, 33 patients who had attended their general practitioner with a foot-related problem and 1000 responders to a population survey of foot disorders. Levels of reported disability were found to be greatest for rheumatology patients and least for community subjects. In addition, the instrument was able to detect differences in disability levels reported by community subjects who did and did not consult with a health care professional and those who did and did not have a history of past and current foot pain. A good level of agreement was found when items on the questionnaire were compared with similar items on the ambulation sub-scale of the Functional Limitation Profile questionnaire. A Cronbach's alpha value of 0.99 and item-total correlation values between 0.25 and 0.62 confirmed the internal consistency of the instrument. Finally the results of a principal components analysis identified three constructs that reflected disabilities that are associated with foot pain: functional limitation, pain intensity and personal appearance. The design of the foot disability questionnaire makes it a suitable instrument for assessing the impact of painful foot conditions in both community and clinical populations.