An Adaptive Pragmatic Randomized Controlled Trial of Emergency Department Acupuncture for Acute Musculoskeletal Pain Management

STUDY OBJECTIVE

Acute musculoskeletal pain in emergency department (ED) patients is frequently severe and challenging to treat with medications alone. The purpose of this study was to determine the feasibility, acceptability, and effectiveness of adding ED acupuncture to treat acute episodes of musculoskeletal pain in the neck, back, and extremities.

METHODS

In this pragmatic 2-stage adaptive open-label randomized clinical trial, Stage 1 identified whether auricular acupuncture (AA; based on the battlefield acupuncture protocol) or peripheral acupuncture (PA; needles in head, neck, and extremities only), when added to usual care was more feasible, acceptable, and efficacious in the ED. Stage 2 assessed effectiveness of the selected acupuncture intervention(s) on pain reduction compared to usual care only (UC). Licensed acupuncturists delivered AA and PA. They saw and evaluated but did not deliver acupuncture to the UC group as an attention control. All participants received UC from blinded ED providers. Primary outcome was 1-hour change in 11-point pain numeric rating scale.

RESULTS

Stage 1 interim analysis found both acupuncture styles similar, so Stage 2 continued all 3 treatment arms. Among 236 participants randomized, demographics and baseline pain were comparable across groups. When compared to UC alone, reduction in pain was 1.6 (95% confidence interval [CI]: 0.7 to 2.6) points greater for AA+UC and 1.2 (95% CI: 0.3 to 2.1) points greater for PA+UC patients. Participants in both treatment arms reported high satisfaction with acupuncture.

CONCLUSION

ED acupuncture is feasible and acceptable and can reduce acute musculoskeletal pain better than UC alone.

Teaching of manual cataract extraction in ophthalmic surgical training programmes

BACKGROUND

Manual cataract extraction techniques such as extracapsular cataract extraction (ECCE) or manual small incision cataract (MSICS) surgery have been replaced by phacoemulsification cataract surgery. Surgical training opportunities for manual techniques of cataract extraction are limited in modern surgical training programmes.

AIMS

This study evaluated the current trends of ECCE/MSICS training opportunities amongst trainees and trainers in the Irish Ophthalmic Surgical Training Program.

METHODS

An electronic survey was distributed to all ophthalmic surgical trainees and consultants in the country. It addressed the experience and exposure to ECCE/MSICS.

RESULTS

Nineteen of 33 (57%) trainees and 29 of 55 (55%) of consultants completed the survey. Twelve of 19 (63%) trainees viewed an ECCE procedure performed live. Twenty-seven of 29 (93%) consultants performed an ECCE procedure during their surgical career; 8 of 27 (30%) performed an ECCE within the last 1-3 years. Fourteen of 19 (74%) trainees stated they do not feel confident converting from phacoemulsification to ECCE independently. Sixteen of 19 (89%) trainees believe manual cataract extraction training should be included in their surgical training. Nineteen of 29 (65%) consultants believe training in manual cataract extraction should be part of the surgical training programme.

CONCLUSIONS

There is a paucity of manual cataract extraction being performed in Ireland, limiting live surgical training in this technique. This survey highlights the limited experience of trainees in this valuable skill that is occasionally required for a successful surgical outcome. The authors conclude that wet laboratory simulated training of manual cataract extraction will bridge this gap.

Managing Chronic Pain in Cancer Survivorship: Communication Challenges and Opportunities as Described by Cancer Survivors

OBJECTIVES

Many cancer survivors experience chronic pain after completing curative-intent treatment. Based on available data, chronic pain may be undertreated in this context; however, little is known about cancer survivors' experiences with clinical management of chronic pain. The purpose of this study was to better understand cancer survivors' pain management experiences after curative-intent treatment.

METHODS

We conducted 13 semi-structured interviews with a convenience sample of cancer survivors who had completed treatment for stage I-III breast, head/neck, lung or colorectal cancer. We used a thematic approach to qualitative data analysis.

RESULTS

Participants described that chronic pain often goes unrecognized by their providers, potentially due to limitations in how pain is assessed clinically and the tendency of both cancer survivors and providers to minimize or invalidate the pain experience. To improve communication, participants suggested that providers ask more open-ended questions about their pain, help them to establish functional goals, and provide patients with options for pain management.

SIGNIFICANCE OF RESULTS

This study demonstrates the importance of provider-initiated communication around pain management for cancer survivors to make them feel more supported in their care. Communication and shared decision-making interventions may improve cancer survivor-provider communication around chronic pain management, addressing an important gap in survivorship care.

Clinician Perspectives on Managing Chronic Pain After Curative-Intent Cancer Treatment

PURPOSE

Among cancer survivors who have completed curative-intent treatment, the high prevalence and adverse consequences of chronic pain are well documented. Yet, research on clinicians' experiences with and perspectives on managing chronic pain among cancer survivors is critically lacking.

METHODS

We conducted semistructured interviews with 17 clinicians (six oncology, three palliative care, and eight primary care) affiliated with an academic medical center. Interview questions addressed clinicians' experiences with and perspectives on managing chronic pain (with or without opioid therapy) during the transition from active treatment to survivorship. A multidisciplinary team conducted content analysis of interview transcripts to identify and refine themes related to current practices and challenges in managing chronic pain in this context.

RESULTS

Overall, clinicians perceived chronic pain to be relatively uncommon among cancer survivors. Identified challenges included a lack of clarity about which clinician (or clinicians) are best positioned to manage chronic pain among cancer survivors, and (relatedly) complexities introduced by long-term opioid management, with many clinicians describing this practice as outside their skill set. Additionally, although most clinicians recognized chronic pain as a biopsychosocial phenomenon, they described challenges with effectively managing psychosocial stressors, including difficulty accessing mental or behavioral health services for cancer survivors.

CONCLUSION

Discovered challenges highlight unmet needs related to cancer survivor-clinician communication about chronic pain and the absence of a chronic pain management home for cancer survivors, including those requiring long-term opioid therapy. Research evaluating routine pain monitoring and accessible, tailored models of multimodal pain care in survivorship may help to address these challenges.

Advances in e-learning in undergraduate clinical medicine: a systematic review

BACKGROUND

E-learning is recognised as a useful educational tool and is becoming more common in undergraduate medical education. This review aims to examine the scope and impact of e-learning interventions on medical student learning in clinical medicine, in order to aid medical educators when implementing e-learning strategies in programme curricula.

METHODS

A systematic review compliant with PRISMA guidelines that appraises study design, setting and population, context and type of evaluations. Specific search terms were used to locate articles across nine databases: MEDLINE/PubMed, ScienceDirect, EMBASE, Cochrane Library, ERIC, Academic Search Complete, CINAHL, Scopus and Google Scholar. Only studies evaluating e-learning interventions in undergraduate clinical medical education between January 1990 and August 2021 were selected. Of the 4,829 papers identified by the search, 42 studies met the inclusion criteria.

RESULTS

The 42 studies included varied in scope, cognitive domain, subject matter, design, quality and evaluation. The most popular approaches involved multimedia platforms (33%) and case-based approaches (26%), were interactive (83%), asynchronous (71%) and accessible from home (83%). Twelve studies (29%) evaluated usability, all of which reported positive feedback. Competence in use of technology, high motivation and an open attitude were key characteristics of successful students and preceptors.

CONCLUSIONS

Medical education is evolving consistently to accommodate rapid changes in therapies and procedures. In today's technologically adept world, e-learning is an effective and convenient pedagogical approach for the teaching of undergraduate clinical medicine.

Acupuncture for acute musculoskeletal pain management in the emergency department and continuity clinic: a protocol for an adaptive pragmatic randomised controlled trial

INTRODUCTION

Chronic musculoskeletal pain causes a significant burden on health and quality of life and may result from inadequate treatment of acute musculoskeletal pain. The emergency department (ED) represents a novel setting in which to test non-pharmacological interventions early in the pain trajectory to prevent the transition from acute to chronic pain. Acupuncture is increasingly recognised as a safe, affordable and effective treatment for pain and anxiety in the clinic setting, but it has yet to be established as a primary treatment option in the ED.

METHODS AND ANALYSIS

This pragmatic clinical trial uses a two-stage adaptive randomised design to determine the feasibility, acceptability and effectiveness of acupuncture initiated in the ED and continued in outpatient clinic for treating acute musculoskeletal pain. The objective of the first (treatment selection) stage is to determine the more effective style of ED-based acupuncture, auricular acupuncture or peripheral acupuncture, as compared with no acupuncture. All arms will receive usual care at the discretion of the ED provider blinded to treatment arm. The objective of the second (effectiveness confirmation) stage is to confirm the impact of the selected acupuncture arm on pain reduction. An interim analysis is planned at the end of stage 1 based on probability of being the best treatment, after which adaptations will be considered including dropping the less effective arm, sample size re-estimation and unequal treatment allocation ratio (eg, 1:2) for stage 2. Acupuncture treatments will be delivered by licensed acupuncturists in the ED and twice weekly for 1 month afterward in an outpatient clinic.

ETHICS AND DISSEMINATION

This study has been reviewed and approved by the Duke University Health System Institutional Review Board. Informed consent will be obtained from all participants. Results will be disseminated through peer-review publications and public and conference presentations.

TRIAL REGISTRATION NUMBER

NCT04290741.

Late onset sclerotomy dehiscence in a patient with Marfan syndrome presenting as recurrent episodes of raised intraocular pressure

A man in his 50s presented to the eye emergency department on three separate occasions complaining of blurred vision and discomfort in the left eye. He had a history of Marfan syndrome and had undergone bilateral 20-gauge (G) pars plana vitrectomy and lensectomy 20 years prior for ectopia lentis. On examination he had epithelial corneal oedema, raised intraocular pressure >40 mm Hg and conjunctival chemosis, which later appeared as a bleb-like conjunctival elevation. Acute treatment with oral acetazolamide and topical ocular hypotensive agents produced a marked reduction in intraocular pressure to 2–4 mm Hg. A presumed diagnosis of a leaking scleral wound was made. He underwent scleral exploration under general anaesthesia and a leaking sclerotomy was uncovered. The defect was repaired successfully using a scleral patch graft. Late dehiscence of a sclerotomy has been reported rarely in patients with Marfan syndrome. This is the first reported case to present atypically with intermittent episodes of raised intraocular pressure rather than with hypotony.

Implementation of a comprehensive hospitalist-led initiative to improve care for patients with opioid use disorder

BACKGROUND

As opioid-related hospitalizations rise, hospitals must be prepared to evaluate and treat patients with opioid use disorder (OUD). We implemented a hospitalist-led program, Project Caring for patients with Opioid Misuse through Evidence-based Treatment (COMET) to address gaps in care for hospitalized patients with OUD.

OBJECTIVE

Implement evidence-based treatment for inpatients with OUD and refer to postdischarge care.

DESIGN, SETTING, AND PARTICIPANTS

Project COMET launched in July 2019 at Duke University Hospital (DUH), an academic medical center in Durham, NC.

INTERVENTION, MAIN OUTCOMES, AND MEASURES

We engaged key stakeholders, performed a needs assessment, and secured health system funding. We developed protocols to standardize OUD treatment and employed a social worker to facilitate postdischarge care. Electronic health records were utilized for data analysis.

RESULTS

COMET evaluated 512 patients for OUD during their index hospitalization from July 1, 2019 through June 30, 2021. Seventy-one percent of patients received medication for OUD (MOUD) during admission. Of those who received buprenorphine during admission, 64% received a discharge prescription. Of those who received methadone during admission, 83% of eligible patients were connected to a methadone clinic. Among all patients at DUH with OUD, MOUD use during hospitalization and at discharge increased in the post-COMET period compared to the pre-COMET period (p < .001 for both).

CONCLUSION

Our program is one of the first to demonstrate successful implementation of a hospitalist-led, comprehensive approach to caring for hospitalized patients with OUD and can serve as an example to other institutions seeking to implement life-saving, evidence-based treatment in this population.

249 A SURVEY OF IRISH DOCTORS VIEWS ON FLEXIBLE TRAINING

Background

We aimed to establish the views of non consultant hospital doctors working in Ireland on the options available for ‘Flexible Training’ or ‘Less-Than-Full-Time-Training’. Our population is ageing rapidly, and an expanding workforce will be required. Difficulties with doctor retention and recruitment are growing challenges in Ireland.

Methods

An anonymised survey of 9 questions was carried out using Survey Monkey®. Question format included multiple choice, yes/no or a free text box. This was disseminated via the Royal College of Physicians of Ireland to 1,557 trainees of the Institute of Medicine, the national postgraduate body for medical specialties. It was also circulated to members of the Irish Medical Organisation, the national medical organisation, and to approximately 200 doctors across two hospitals on social media.

Results

There were 674 (84.3%) respondents in training- 46.3% BST, 53.7% HST; and 125 (15.6%) non-training respondents. Doctors overwhelmingly felt trainees should have access to flexible training (n = 849, 99.41%), with 82.39% reporting they would apply (n = 702). Most (92.5%) felt that 16 WTE positions was inadequate (n = 789). Reasons chosen for not applying for flexible training included- 36.1% (n = 169) felt it could impact their career, 25.4% (n = 119) identified they did not meet the criteria, 14.32% (n = 67) reported no interest, while 24.1% (n = 113) gave ‘other’ reasons including lengthy training, salary impacts, and not having a requirement for flexible training. When asked about suggestions for improving flexible training, 19.7% chose ‘offer more places’, 6.7%-‘remove eligibility criteria’, 19.6% -‘offer job sharing options’, 9.5%- ‘allow more flexible training years’, 17.7% -‘regional based training’, 22.5% -‘all of the above’, 4.9%—‘other’.

Conclusion

Our survey suggests non consultant hospital doctors in Ireland strongly desire an expansion of current flexible training options. This is essential to ensure Ireland is an attractive place for doctors to work, to support their health and wellbeing, and to ensure an adequate workforce to care for an ageing population.

The financial lives of female sex workers in Addis Ababa, Ethiopia: Implications for economic strengthening interventions for HIV prevention

Understanding the financial context of the lives of female sex workers (FSWs) is essential to address structural drivers of HIV risk. We used a financial diary methodology to record daily financial transactions over six weeks from a stratified purposive sample (n = 34) of FSWs in Addis Ababa, Ethiopia. FSWs also provided information on their experience with gender-based violence and condom use. FSWs generated 90.1% of total cash from sex work, with a median weekly income of USD 60.53. They engaged mostly in protected vaginal sex, earning approximately USD 4.57 per act. Food, housing, and clothing represented the largest areas of expenditure. Around 17% of expenses were recorded as costs of sex work (e.g., alcohol). Median weekly expenditures accounted for 62% of median weekly income. Nearly all participants reported depositing money into savings at least once over six weeks, while 71% reported a loan transaction during the six-week period, most as borrowers. Findings suggest that financial literacy and formalized savings activities, with life skills and empowerment training, have potential to build FSW's economic resilience, mitigating a structural driver of sex work and HIV risk.

The lysophosphatidic acid axis in fibrosis: Implications for glaucoma

Glaucoma is a common progressive optic neuropathy that results in visual field defects and can lead to irreversible blindness. The pathophysiology of glaucoma involves dysregulated extracellular matrix remodelling in both the trabecular meshwork in the anterior chamber and in the lamina cribrosa of the optic nerve head. Fibrosis in these regions leads to raised intraocular pressure and retinal ganglion cell degeneration, respectively. Lysophosphatidic acid (LPA) is a bioactive lipid mediator which acts via six G-protein coupled receptors on the cell surface to activate intracellular pathways that promote cell proliferation, transcription and survival. LPA signalling has been implicated in both normal wound healing and pathological fibrosis. LPA enhances fibroblast proliferation, migration and contraction, and induces expression of pro-fibrotic mediators such as connective tissue growth factor. The LPA axis plays a major role in diseases such as idiopathic pulmonary fibrosis, where it has been identified as an important pharmacological target. In glaucoma, LPA is present in high levels in the aqueous humour, and its signalling has been found to increase resistance to aqueous humour outflow through altered trabecular meshwork cellular contraction and extracellular matrix deposition. LPA signalling may, therefore, also represent an attractive target for treatment of glaucoma. In this review we wish to describe the role of LPA and its related proteins in tissue fibrosis and glaucoma.

Community optometrist-led post-operative cataract care: how many patients re-present to the hospital ophthalmic department?

Background

Cataract surgery represents a significant workload for ophthalmologists in Ireland. Post-operative shared care with community optometrists can reduce the need for hospital follow-up appointments.

Aims

Eight years after the introduction of a shared-care pathway, we wished to quantify the proportion of patients discharged to the community for post-operative follow-up, and the number that re-present to the hospital due to cataract-related issues.

Methods

We collected data on all patients who underwent cataract surgery in our centre over a three month period. Electronic patient records were used to establish whether the patient was discharged on the day of surgery, and whether they re-attended the department post-operatively. Post-operative complications were recorded.

Results

394 cataract procedures were carried out over the three months. 369 patients were discharged to an optometrist for their post-operative care. Of those, 38 were re-referred or re-presented to the hospital ophthalmic service. 21 of these had a post-operative complication. Complications included seven cases of post-operative uveitis, 5 patients with cystoid macular oedema, one retinal detachment and one retained lens fragment.

Conclusions

Community optometrist-led post-operative care for uncomplicated patients is an effective way of reducing the workload associated with cataract surgery. Re-referral pathways must be in place to facilitate timely management of post-operative complications.

Management of Bone Fragility in Primary Care in Ireland

This study evaluated the prevention of bone fragility fractures in a representative sample of four Irish general practices. The clinical records of 243 patients potentially at risk of bone fragility were studied. One hundred and fourteen (47%) had a dual energy x-ray absorptiometry (DEXA) scan. Osteoporosis was established in 42 (17%) and osteopaenia in 28 (11%). One hundred and fifty-two (63%) were currently being prescribed bisphosphonates. Thirty-four (22%) of those on bisphosphonates did not have a baseline DEXA scan performed prior to commencing treatment and further analysis did not show a clear rationale for initiation of the treatment in this group of patients. Forty-six (30%) patients on bisphosphonates had been prescribed them for over 5 years without any apparent review to see if they were still indicated. There was no record of any of the practices having carried out a fracture risk score assessment prior to commencing bone fragility treatment. The implications are that bone fragility management warrants urgent review.

Indicators of young women's modern contraceptive use in Burkina Faso and Mali from Demographic and Health Survey data

Background

High total fertility rates in Burkina Faso and Mali are leading to population growth beyond the agricultural and fiscal means of its citizens. Providing access to affordable family planning methods is a key step in driving the demographic transition where fertility and mortality rates decline. Furthermore, both nations face significant challenges as climate change is projected to disproportionately impact the western Sahel region undermining environmental, social and economic stability within the region. This analysis was included in formative research to inform family planning programming. The aim of this study was to examine possible indicators of long acting and permanent contraceptive method (LAPM) and short-term method (STM) use for young women in Burkina Faso and Mali.

Methods

Secondary data analysis was conducted using the three most recent Demographic and Health Survey (DHS) datasets for Burkina Faso (1998, 2003, 2010) and Mali (2001, 2006, 2012). Women ages 15–24, at risk for unwanted pregnancy were included in these analyses. Summary descriptive statistics across all time points are reported and multinomial logistic regression was used with the most recent data to determine potential indicators of different types of modern contraceptive methods.

Results

In Burkina Faso in 2010, 24% of women ages 15–24 were using modern contraceptives. Only 2.9% reported using LAPMs in 2010, an increase from 0.3% in 1998. In Mali, modern contraceptive use increased more recently, rising from 9.4% in 2001 to 10.2% in 2006 to 15.3% in 2012. LAPM use also increased from 0.3% in 2001 to 4.1% in 2012. Significant indicators of LAPM contraceptive use in both countries included educational attainment, ideal family size, home ownership and husband’s desire for more children.

Conclusions

Young women in Burkina Faso and Mali are increasingly using modern contraceptives for family planning; however, the LAPM contraceptive prevalence rate remains low. Our analysis indicates that social norms around ideal family size for both men and women continue to drive young women’s choices around family planning and impede use of LAPMs. To increase modern contraceptive use and curb fertility rates, local governments and development organizations should focus on women’s empowerment and include male partners.

Electronic supplementary material

The online version of this article (10.1186/s40834-017-0053-6) contains supplementary material, which is available to authorized users.

Adherence to COPD management guidelines in general practice? A review of the literature

BACKGROUND

Chronic obstructive pulmonary disease (COPD) is a progressive illness that is mostly managed in the general practice setting. The Global Initiative for Chronic Obstructive Lung Disease (GOLD) guidelines are the international gold standard, and it is important to understand how these are being applied in general practice.

AIMS

This review aimed to assess the current level of adherence to international best practice guidelines among general practitioners in relation to COPD.

METHODS

PubMed and EMBASE searches (from 2012 to 2016) were performed and used the search terms guidelines, COPD, general practitioners, and primary care. Papers were excluded if they were not primary sources, were published before 2012, or did not pertain to a general practice setting.

RESULTS

After applying set inclusion and exclusion criteria, 11 studies were retrieved. These papers were grouped under three categories: diagnosis, pharmacological, and non-pharmacological management, based on the GOLD guidelines.

CONCLUSIONS

Current studies show significant variability in adherence to the GOLD guidelines. Barriers identified include lack of clarity, unfamiliarity with recommendations, and lack of familiarity with the guidelines. If general practice is expected to manage COPD and other chronic diseases, health service investment is needed to provide appropriate focused guidelines, to support their dissemination and resources to implement them in practice.

Educational interventions: equipping general practice for youth mental health and substance abuse. A discussion paper

BACKGROUND

Youth mental health issues and substance abuse are important causes of morbidity and mortality in Ireland. General practice is a frequent point of contact for young people, however, reluctance amongst this population group to disclose mental health issues and a lack of confidence amongst GPs in dealing with them have been reported. Focussed training interventions with formal evaluation of their acceptability and effectiveness in achieving learning, behavioural change and impact on clinical practice are needed.

AIMS

This paper aims to examine the literature on general practice in youth mental health, specifically, factors for an educational intervention for those working with young people in the community.

METHODS

This review paper was carried out by an online search of PubMed on the recent literature on mental health and on educational interventions for health care workers in primary care.

RESULTS

A number of papers describing educational interventions for GPs and primary care workers were found and analysed. Key areas to be addressed when identifying and treating mental health problems were prevention, assessment, treatment, interaction with other services and ongoing support. Important elements of an educational intervention were identified.

DISCUSSION

Several barriers exist that prevent the identification and treatment of these problems in primary care. An educational intervention should help GPs address these issues. Any intervention should be rigorously evaluated.

CONCLUSION

With the shift in services to the community in Irish health policy, the GP with appropriate training could take the lead in early intervention in youth mental health and addiction.

Towards vertical integration in general practice education: literature review and discussion paper

BACKGROUND

Medical education policy in Ireland has enabled an increase in undergraduate and postgraduate education activity in general practice. Internationally, 'vertical integration in general practice education' is suggested as a key strategy to support the implementation of this policy development.

AIMS

To review the emerging literature on vertical integration in GP education, specifically to define the concept of 'vertical integration' with regard to education in general practice and to describe its benefits and challenges.

METHODS

We searched 'Pubmed', 'Academic Search Complete', 'Google', and 'MEDLINE' databases using multiple terms related to 'vertical integration' and 'general practice education' for relevant articles published since 2001. Discussion papers, reports, policy documents and position statements were identified from reference lists and retrieved through internet searches.

RESULTS

The key components of 'vertical integration' in GP education include continuous educational pathway, all stages in GP education, supporting the continuing educational/professional development needs of learners at each stage and effective curriculum planning and delivery. Many benefits (for GPs, learners and the community) and many challenges (for GPs/practices, learners and GPs in training) have been described. Characteristics of successful implementation include role sharing and collaborative organisational structures.

CONCLUSIONS

Recent developments in medical education in Ireland, such as the increase in medical school clinical placements in general practice and postgraduate GP training and the introduction of new competence assurance requirements offer an important opportunity to further inform how vertical integration can support increased educational activity in general practice. Describing this model, recognising its benefits and challenges and supporting its implementation in practice are priorities for medical education in Ireland.

Pretreatment of endothelial progenitor cells with osteopontin enhances cell therapy for peripheral vascular disease

Tissue necrosis resulting from critical limb ischemia (CLI) leads to amputation in a significant number of patients. Autologous cell therapy using angiogenic cells such as endothelial progenitor cells (EPCs) holds promise as a treatment for CLI but a limitation of this treatment is that the underlying disease etiology that resulted in CLI may also contribute to dysfunction of the therapeutic EPCs. This study aimed to elucidate the mechanism of EPC dysfunction using diabetes mellitus as a model and to determine whether correction of this defect in dysfunctional EPCs ex vivo would improve the outcome after cell transplantation in the murine hind limb ischemia model. EPC dysfunction was confirmed in a homogenous population of patients with type 1 diabetes mellitus and a microarray study was preformed to identify dysregulated genes. Notably, the secreted proangiogenic protein osteopontin (OPN) was significantly downregulated in diabetic EPCs. Furthermore, OPN-deficient mice showed impaired recovery following hind limb ischemia, suggesting a critical role for OPN in postnatal neovascularization. EPCs isolated from OPN KO mice showed decreased ability to adhere to endothelial cells as well as impaired angiogenic potential. However, this dysfunction was reversed upon exposure to recombinant OPN, suggesting that OPN may act in an autocrine manner on EPCs. Indeed, exposure of OPN knockout (KO) EPCs to OPN was sufficient to induce the secretion of angiogenic proteins (IL-6, TGF-α, and FGF-α). We also demonstrated that vascular regeneration following hind limb ischemia in OPN KO mice was significantly improved upon injection of EPCs preexposed to OPN. We concluded that OPN acts in an autocrine manner on EPCs to induce the secretion of angiogenic proteins, thereby playing a critical role in EPC-mediated neovascularization. Modification of cells by exposure to OPN may improve the efficacy of autologous EPC transplantation via the enhanced secretion of angiogenic proteins.

Osteopontin: a key cytokine in cell-mediated and granulomatous inflammation

Osteopontin (Opn) is a secreted adhesive, glycosylated phosphoprotein that contains the arginine-glycine-aspartic acid (RGD) cell-binding sequence that is found in many extracellular matrix (ECM) proteins (for a review of Opn see References Denhardt & Guo 1993; Patarca et al. 1993; Rittling & Denhardt 1999). Since its initial description in 1979 as a secreted protein associated with malignant transformation, Opn has been independently discovered by investigators from diverse scientific disciplines, and has been associated with a remarkable range of pathologic responses. Opn is an important bone matrix protein, where it is thought to mediate adhesion of osteoclasts to resorbing bone. However, studies from the past decade have identified an alternative role for Opn as a key cytokine regulating tissue repair and inflammation. Recent work by our laboratory and that of others has underlined the importance of Opn as a pivotal cytokine in the cellular immune response. Despite this Opn is not well known to the immunologist. In this review we will focus on studies that pertain to the role of Opn in cell-mediated and granulomatous inflammation.

Tracheobronchial amyloidosis. The Boston University experience from 1984 to 1999

Tracheobronchial amyloidosis (TBA), an idiopathic disorder characterized by deposition of fibrillar proteins in the tracheobronchial tree, occurred in 10 patients referred to the Amyloid Program at Boston University over the past 15 years. Fewer than 100 cases of TBA have been described; only 1 series encompassed more than 3 patients. We analyzed our experience with biopsy-proven TBA to define better its natural history. Follow-up averaged approximately 8 years and was obtained in all cases, making this outcome reporting the largest and most complete to date. Three of these patients were prospectively studied for up to 24 months to examine the utility of bronchoscopy, computerized tomography (CT) imaging, and pulmonary function tests (PFTs) in monitoring disease progression. No patient with TBA developed signs or symptoms of systemic amyloidosis during the period reviewed. Conversely, tracheobronchial disease was not diagnosed in 685 patients with primary systemic (AL) amyloidosis during the 15-year study period at Boston University. Bronchoscopy proved most useful in establishing the diagnosis by biopsy. Narrowing of major airways limited its inspection of the tracheobronchial tree, however. In contrast, CT imaging provided quantitative assessment of airway narrowing and mural thickening--2 major consequences of amyloid infiltration. These CT features, in the presence of mural calcifications sparing the posterior tracheal membrane, have been reported in few disorders other than TBA. The ability of CT to map airway involvement and identify extraluminal manifestations of TBA made it the study of choice for establishing disease extent. Three patterns of disease were evident by CT imaging and bronchoscopic examination: proximal, mid, and distal airways involvement. Those with severe proximal disease had significantly decreased air flows, air trapping, and fixed upper airway obstruction on PFTs. Patients with distal disease had normal airflows. PFTs could not clearly distinguish proximal from severe mid airways disease. Thirty percent of patients died within 7-12 years after diagnosis, all having proximal or severe mid airways disease. Repeated rigid bronchoscopic debridement and laser treatments did not prevent progressive airways narrowing in patients dying from TBA. Most patients with mid airways involvement, and all distal airway cases, had either stagnant disease or slowly increasing amyloid deposits when followed for up to 14 years. In a small subset of patients followed prospectively, serial PFTs were most sensitive to disease progression. CT-derived measures of airway lumen diameter and wall thickness did not change significantly despite marked improvements in airflow after rigid bronchoscopy. Our experience suggests that serial PFTs and CT imaging together offer the best assessment of airway involvement and disease progression in patients with TBA. In the future, radiation therapy may provide more definitive treatment of TBA than debulking procedure have to date.

Improvements in anaesthetic care resulting from a critical incident reporting programme

The rôle of an anaesthetic incident reporting programme in improving anaesthetic safety was studied. The programme had been running for 4 to 5 years in three large hospitals in Hong Kong and more than 1000 incidents have been reported. The number of reports being made and frequency of the various categories of incident reported, did not alter during the study period. Sixty nine percent of incidents were considered to be preventable. Human error contributed to 76% of incidents and violations of standard practice to 30% of incidents. The programme was effective in its ability to detect latent errors in the anaesthesia system and when these were corrected, incidents did not recur. The frequency with which various contributing factors were cited did not decrease with time. With the exception of problems dealt with by specific protocol development, the study found no evidence that an increasing awareness of the problem of human error was effective in reducing this kind of problem.

Oxygen desaturation during sleep and exercise in patients with severe chronic obstructive pulmonary disease

Patients with chronic obstructive pulmonary disease (COPD) have varying degrees of arterial oxyhaemoglobin desaturation during sleep, which have been shown to correlate with awake oxygen levels. We wished to ascertain if exercise desaturation was a better predictor of nocturnal oxygen desaturation than daytime blood gases. We studied 25 COPD patients with PaO2 < 10 kPa (mean = 8.6 kPa), 12 of whom were normocapnic (PaCO2 < or = 6 kPa, Group A), and 13 of whom were hypercapnic (PaCO2 > 6 kPa, Group B), by means of overnight oximetry and maximum treadmill exercise testing. The overall group desaturated significantly more during sleep than exercise [12.9 +/- 10.5 fall in nocturnal oxygen saturation (SaO2) vs. 4.5 +/- 3.7, P < 0.01]. Group B had a lower minimum SaO2 during sleep than Group A (74.3 +/- 13.4 vs. 84.6 +/- 5.8, P < 0.05), despite very similar pre-sleep SaO2 (91.9 +/- 3.2 vs. 92.8 +/- 2.9, P = n.s.). Awake SaO2 correlated well with both mean values (r = 0.7, P < 0.001), and minimum sleep SaO2 (r = 0.44, P < 0.05), but not with the fall in sleep SaO2 (r = 0.21, P = n.s.). Minimum sleep and exercise SaO2 were also significantly correlated (r = 0.44, P < 0.05), but the fall in SaO2 during sleep and exercise was not (P = n.s.). We conclude that exercise studies add no extra information to awake blood gas analysis in predicting the likelihood of nocturnal oxygen desaturation in patients with COPD.

Critical incident reporting in an anaesthetic department quality assurance programme

The critical incident technique was introduced as an additional form of quality assurance to an anaesthetic department of a major Hong Kong teaching hospital. In one year, 125 critical incidents were reported from over 16,000 anaesthetics. The most common incidents reported concerned the airway, breathing systems, and drug administration, with inadequate checking of equipment a frequent associated factor. Human error was a factor in 80% of incidents. Critical incidents were reported for the time during which the patient was under the anaesthetist's care. The majority occurred at induction or during anaesthesia, and were reported for all surgical subspecialties. Half of the incidents were detected by the anaesthetist and one third by monitoring equipment. Although there were improvements in anaesthetic care as a consequence of increased vigilance, critical incidents still occurred. Critical incident reporting highlighted problems not otherwise covered by case and peer reviews, and complemented our quality assurance programme.