Examining evidence for a relationship between human-animal interactions and common mental disorders during the COVID-19 pandemic: a systematic literature review.

Introduction: COVID-19 lockdowns, shelter in place, closures of transportation and mental health services, and dearth of mental health providers created new barriers to obtaining support for mental health needs at a time of increased rates of anxiety and depression. During the pandemic, a record number of households owned and adopted pets, opening a potential avenue to investigate the relationship between pets and mental health. This systematic literature review examined the question: What is the evidence for a relationship between human-animal interaction and/or animal ownership and common mental disorders among adults who interacted with pets compared to adults who did not during the COVID-19 pandemic? Methods: To address this question, four databases were searched: Medline, PsycINFO, Web of Science, and SCOPUS for peer-reviewed literature published between 2020 and July 2023. Of the 1,746 articles identified by the searches, 21 studies were included in this review. Results: Results suggest that there exists a relationship between animal ownership and strong pet attachment and pet interaction, though the directionality of the relationship was not investigated by the included studies. There was an association between having a stronger relationship with a pet and lower feelings of depression and other mental health symptoms. There was also evidence of an association between anxiety and higher levels of animal attachment. Conclusion: Understanding the association between human-animal interaction and common mental disorders may be helpful to clinicians assessing the mental health of clients. Clinicians may glean additional insight about stressors, risk factors, social supports, and lifestyle of clients based on the client's status as a pet owner. Future research could further explore the direction of the causal relationship of human-animal interaction and/or animal ownership on common mental disorders; this could further inform how the HAI relationship can be used to support clients with mental health struggles.

sTREM-1 is elevated in cystic fibrosis and correlates with proteases.

BACKGROUND: sTREM-1 (soluble triggering receptor expressed on myeloid cells-1) is a novel inflammatory marker that may be of clinical use in cystic fibrosis (CF). Dysregulation of the TREM pathway has been demonstrated in other inflammatory diseases and modulation in animal models has therapeutic benefit. We hypothesised that sTREM-1 could act as a biomarker of disease in cystic fibrosis. METHODS: Plasma from 17 patients with CF (stable and pre and post pulmonary exacerbation) and eight healthy volunteers was analyzed for sTREM-1 and proteases (matrix metalloproteinase-8 (MMP-8), MMP-9, and human neutrophil elastase HNE). RESULTS: sTREM-1 Levels were elevated in stable CF subjects compared to controls (148 pg/ml (130-160) [median(IQR)] vs. 87 (55-118) (P < 0.01)) but were not further increased during pulmonary exacerbation nor decreased after antibiotic treatment in CF. Protease levels were increased in CF plasma compared to controls: MMP-8 = 3.1 ng/ml (1.5-7.6) vs. 0.3 (0.18-0.53) (P < 0.01) (Wilcoxon); MMP-9 = 170 ng/ml (124-282) vs. 49 (39-90) (P < 0.01); HNE = 30.2 ng/ml (22.7-30.9) vs. 17.5 (11.2-22.2) (P < 0.05). sTREM-1 correlated positively with protease levels lnMMP-8 r2 = 0.55 (P = 0.08), lnMMP-9 r2 = 0.61(P < 0.05), lnHNE r2 = 0.35 (P < 0.05). CONCLUSIONS: sTREM-1 is constitutively elevated in CF and positively correlates with protease levels. Modulation of this pathway may be of therapeutic benefit to patients with CF. Pediatr Pulmonol. 2017;52:467-471. © 2017 Wiley Periodicals, Inc.

Rapid infrared mapping for highly accurate automated histology in Barrett's oesophagus.

Barrett's oesophagus (BE) is a premalignant condition that can progress to oesophageal adenocarcinoma. Endoscopic surveillance aims to identify potential progression at an early, treatable stage, but generates large numbers of tissue biopsies. Fourier transform infrared (FTIR) mapping was used to develop an automated histology tool for detection of BE and Barrett's neoplasia in tissue biopsies. 22 oesophageal tissue samples were collected from 19 patients. Contiguous frozen tissue sections were taken for pathology review and FTIR imaging. 45 mid-IR images were measured on an Agilent 620 FTIR microscope with an Agilent 670 spectrometer. Each image covering a 140 µm × 140 µm region was measured in 5 minutes, using a 1.1 µm2 pixel size and 64 scans per pixel. Principal component fed linear discriminant analysis was used to build classification models based on spectral differences, which were then tested using leave-one-sample-out cross validation. Key biochemical differences were identified by their spectral signatures: high glycogen content was seen in normal squamous (NSQ) tissue, high glycoprotein content was observed in glandular BE tissue, and high DNA content in dysplasia/adenocarcinoma samples. Classification of normal squamous samples versus 'abnormal' samples (any stage of Barrett's) was performed with 100% sensitivity and specificity. Neoplastic Barrett's (dysplasia or adenocarcinoma) was identified with 95.6% sensitivity and 86.4% specificity. Highly accurate pathology classification can be achieved with FTIR measurement of frozen tissue sections in a clinically applicable timeframe.

Staging Early Esophageal Cancer.

Staging esophageal cancer provides a standardized measure of the extent of disease that can be used to inform decisions about therapy and guide prognosis. For esophageal cancer, the treatment pathways vary greatly depending on stage of disease, and accurate staging is therefore crucial in ensuring the optimal therapy for each patient. For early esophageal cancer (T1 lesions), endoscopic resection can be curative and simultaneously gives accurate staging of depth of invasion. For tumors invading the submucosa or more advanced disease, comprehensive investigation is required to accurately stage the tumor and assess suitability for curative resection. A combined imaging approach of computed tomography (CT), positron emission tomography (PET), and endoscopic ultrasound (EUS) offers complementary diagnostic information and gives the greatest chance of accurate staging. Staging laparoscopy can identify peritoneal disease and small superficial liver lesions that could be missed on CT or PET, and alters management in up to 20 % of patients. Optical diagnostic techniques offer the prospect of further extending the possibilities of endoscopic staging in real time. Optical coherence tomography can image superficial lesions and could provide information on depth of invasion for these lesions. Real-time lymph node analysis using optical diagnostics such as Raman spectroscopy could be used to support immediate endoscopic therapy without waiting for results of cytology or further investigations.

Multi-centre Raman spectral mapping of oesophageal cancer tissues: a study to assess system transferability.

The potential for Raman spectroscopy to provide early and improved diagnosis on a wide range of tissue and biopsy samples in situ is well documented. The standard histopathology diagnostic methods of reviewing H&E and/or immunohistochemical (IHC) stained tissue sections provides valuable clinical information, but requires both logistics (review, analysis and interpretation by an expert) and costly processing and reagents. Vibrational spectroscopy offers a complimentary diagnostic tool providing specific and multiplexed information relating to molecular structure and composition, but is not yet used to a significant extent in a clinical setting. One of the challenges for clinical implementation is that each Raman spectrometer system will have different characteristics and therefore spectra are not readily compatible between systems. This is essential for clinical implementation where classification models are used to compare measured biochemical or tissue spectra against a library training dataset. In this study, we demonstrate the development and validation of a classification model to discriminate between adenocarcinoma (AC) and non-cancerous intraepithelial metaplasia (IM) oesophageal tissue samples, measured on three different Raman instruments across three different locations. Spectra were corrected using system transfer spectral correction algorithms including wavenumber shift (offset) correction, instrument response correction and baseline removal. The results from this study indicate that the combined correction methods do minimize the instrument and sample quality variations within and between the instrument sites. However, more tissue samples of varying pathology states and greater tissue area coverage (per sample) are needed to properly assess the ability of Raman spectroscopy and system transferability algorithms over multiple instrument sites.

Improvement over time in outcomes for patients undergoing endoscopic therapy for Barrett's oesophagus-related neoplasia: 6-year experience from the first 500 patients treated in the UK patient registry.

BACKGROUND: Barrett's oesophagus (BE) is a pre-malignant condition leading to oesophageal adenocarcinoma (OAC). Treatment of neoplasia at an early stage is desirable. Combined endoscopic mucosal resection (EMR) followed by radiofrequency ablation (RFA) is an alternative to surgery for patients with BE-related neoplasia. METHODS: We examined prospective data from the UK registry of patients undergoing RFA/EMR for BE-related neoplasia from 2008 to 2013. Before RFA, visible lesions were removed by EMR. Thereafter, patients had RFA 3-monthly until all BE was ablated or cancer developed (endpoints). End of treatment biopsies were recommended at around 12 months from first RFA treatment or when endpoints were reached. Outcomes for clearance of dysplasia (CR-D) and BE (CR-IM) at end of treatment were assessed over two time periods (2008-2010 and 2011-2013). Durability of successful treatment and progression to OAC were also evaluated. RESULTS: 508 patients have completed treatment. CR-D and CR-IM improved significantly between the former and later time periods, from 77% and 56% to 92% and 83%, respectively (p<0.0001). EMR for visible lesions prior to RFA increased from 48% to 60% (p=0.013). Rescue EMR after RFA decreased from 13% to 2% (p<0.0001). Progression to OAC at 12 months is not significantly different (3.6% vs 2.1%, p=0.51). CONCLUSIONS: Clinical outcomes for BE neoplasia have improved significantly over the past 6 years with improved lesion recognition and aggressive resection of visible lesions before RFA. Despite advances in technique, the rate of cancer progression remains 2-4% at 1 year in these high-risk patients. TRIAL REGISTRATION NUMBER: ISRCTN93069556.

Barrett's oesophagus: how should we manage it?

Endoscopic surveillance remains the core management of non-dysplastic Barrett's oesophagus, although questions regarding its efficacy in reducing mortality from oesophageal adenocarcinoma have yet to be definitively answered, and randomised trial data are awaited. One of the main goals of current research is to achieve risk stratification, identifying those at high risk of progression. The recent British Society of Gastroenterology (BSG) guidelines on surveillance have taken a step in this direction with interval stratification on clinicopathological grounds. The majority of Barrett's oesophagus remains undiagnosed, and this has led to investigation of methods of screening for Barrett's oesophagus, ideally non-endoscopic methods capable of reliably identifying dysplasia. Chemoprevention to prevent progression is currently under investigation, and may become a key component of future treatment. The availability of effective endotherapy means that accurate identification of dysplasia is more important than ever. There is now evidence to support intervention with radiofrequency ablation (RFA) for low-grade dysplasia (LGD), but recent data have emphasised the need for consensus pathology for LGD. Ablative treatment has become well established for high-grade dysplasia, and should be employed for flat lesions where there is no visible abnormality. Of the ablative modalities, RFA has the strongest evidence base. Endoscopic resection should be performed for all visible lesions, and is now the treatment of choice for T1a tumours. Targeting those with high-risk disease will, hopefully, lead to efficacious and cost-effective surveillance, and the trend towards earlier intervention to halt progression gives cause for optimism that this will ultimately result in fewer deaths from oesophageal adenocarcinoma.

Meta-analysis of endoscopic therapy for low-grade dysplasia in Barrett's oesophagus.

BACKGROUND: The optimal management of patients with Barrett's-associated low-grade dysplasia (LGD) is unclear. The objective of this study was to identify systematically all reports of endoscopic treatment of LGD, and to assess outcomes in terms of disease progression, eradication of dysplasia and intestinal metaplasia, and complication rates. METHODS: A systematic review of articles reporting endoscopic treatment of LGD was conducted in accordance with PRISMA guidelines. MEDLINE and Embase databases were searched to identify the relevant literature. Rates of complete eradication of intestinal metaplasia (CE-IM) and dysplasia (CE-D) were reported. The pooled incidence of progression to cancer was calculated following endoscopic therapy. RESULTS: Thirty-seven studies met the inclusion criteria, reporting outcomes of endoscopic therapy for 521 patients with LGD. The pooled incidence of progression to cancer was 3·90 (95 per cent confidence interval (c.i.) 1·27 to 9·10) per 1000 patient-years. CE-IM and CE-D were achieved in 67·8 (95 per cent c.i. 50·2 to 81·5) and 88·9 (83·9 to 92·5) per cent of patients respectively. The commonest adverse event was stricture formation. CONCLUSION: Reports of endoscopic therapy were heterogeneous and follow-up periods were short. There is a high likelihood of historical overdiagnosis of LGD. Endoscopic therapy, particularly radiofrequency ablation, appears safe and effective at eradicating LGD, but does not eliminate the risk of progression to cancer.

Cancer of Oesophagus or Gastricus - New Assessment of Technology of Endosonography (COGNATE): report of pragmatic randomised trial.

BACKGROUND: Endoscopic ultrasonography is recommended for staging gastro-oesophageal cancers, but has never been evaluated. OBJECTIVE: COGNATE (Cancer of Oesophagus or Gastricus - New Assessment of Technology of Endosonography) therefore aimed to evaluate whether adding 'endoscopic ultrasound' (EUS) to the usual staging algorithm changes treatment, improves (quality-adjusted) survival, and uses resources cost-effectively. DESIGN: Pragmatic parallel-group trial. Patients with gastro-oesophageal cancer received standard staging algorithms. Multidisciplinary teams chose provisional management plans from endoscopic mucosal resection, immediate surgery, surgery after chemotherapy, or chemotherapy and radiotherapy. We used dynamic randomisation to allocate consenting patients remotely by telephone in equal proportions between EUS and not. Thereafter we recorded changes in management plan, use of health-care resources, and three aspects of participant-reported quality of life: generic [measured by European Quality of Life - 5 Dimensions (EQ-5D)], cancer related [Functional Assessment of Cancer Therapy - General scale (FACT-G)] and condition-specific [FACT - Additional Concerns scale (FACT-AC)]. We followed participants regularly until death or the end of the trial - for between 1 and 4.5 years. We devised a quality assurance programme to maintain standards of endosonographic reporting. SETTING: Eight British hospitals, of which two - one Scottish teaching hospital and one English district general hospital - contributed 80% of participants; we combined the other six for analysis. PARTICIPANTS: Patients were eligible if they had a diagnosis of gastro-oesophageal cancer, had not started treatment, were free of metastatic disease, were fit for surgery (even if not planned) and had American Society of Anesthesiologists and World Health Organization grades of less than 3. INTERVENTIONS: Intervention group: standard staging algorithm plus EUS; control group: standard staging algorithm. MAIN OUTCOME MEASURES: Primary: quality-adjusted survival. Secondary: survival; health-related quality of life (EQ-5D, FACT-G and FACT-AC scales); changes in management plan; and complete resection rate. Although blinding participants was neither possible nor desirable, those responsible for analysis remained blind until the Trial Steering Committee had reviewed the definitive analysis. RESULTS: We randomised 223 patients, of whom 213 yielded enough data for primary analysis. EUS improved survival adjusted for generic quality of life with a hazard ratio of 0.705 [95% confidence interval (CI) 0.499 to 0.995], and crude survival with a hazard ratio of 0.706 (95% CI 0.501 to 0.996). The benefits of EUS were significantly greater for those with poor initial quality of life, but did not differ between centres. EUS reduced net use of health-care resources by £2860 (95% 'bootstrapped' CI from -£2200 to £8000). Combining benefits and savings shows that EUS is likely to be cost-effective, with 96% probability of achieving the National Institute for Health and Care Excellence criterion of costing of < £20,000 to gain a QALY. There were no serious adverse reactions attributable to EUS. EUS enhanced the management plan for many participants, increased the proportion of tumours completely resected from 80% (44 out of 55) to 91% (48 out of 53), and improved the survival of those who changed plan; although underpinning the significant differences in outcome, none of these process differences was itself significant. CONCLUSION: Endoscopic ultrasound significantly improves (quality-adjusted) survival, has the potential to reduce health-care resource use (not statistically significant) and is probably cost-effective (with 96% probability). We recommend research into the best time to evaluate new technologies. TRIAL REGISTRATION: ISRCTN1444215. FUNDING: This project was funded by the NIHR Health Technology Assessment programme and will be published in full in Health Technology Assessment; Vol. 17, No. 39. See the HTA programme website for further project information.

Current management of Barrett's oesophagus.

Barrett's oesophagus is one of the most common pre-malignant conditions in the world and its incidence is increasing. The management of this disease is currently the subject of research and debate, with medical, endoscopic and operative intervention all having a therapeutic role.

Editorial: Defining a bad Barrett's segment: is it dependent on goblet cells?

The identification of patients with "bad Barrett's" who are at risk of neoplastic progression is a vital and pressing task. The view that specialized intestinal metaplasia with goblet cells is the predominant preneoplastic phenotype has had wide, but by no means universal, acceptance. An important caveat is presented in the thoughtful paper by Liu et al. in this issue. Of 68 patients with columnar metaplasia, 22 patients had no goblet cells identified and 46 had goblet cells in their biopsies. In both groups there were chromosomal and DNA content abnormalities and genetic instability. However, there were no significant differences between these cellular DNA abnormalities in the two groups. Both were significantly different from gastric controls. Thus, all metaplasia in the columnar-lined esophagus may already be on the path to cancer.

Ethical planning for an influenza pandemic.

A U.K. Pandemic Influenza Contingency Plan was developed in 2006 but little research has since been carried out as to how ethically acceptable it will be to society. A survey containing two hypothetical scenarios was distributed to 1,018 hospital staff. The survey considered their attitudes to the professional and ethical responsibilities of healthcare workers, and to resource allocation on the intensive care unit (ICU). Of those distributed, 406 (40%) surveys were returned. During a pandemic, 320 (79%) healthcare professionals would continue to work and 339 (83%) felt it would be unprofessional for doctors to leave work. Only 218 (54%) chose the same patient for the last ICU bed. Most staff surveyed felt they should (professionally) and would (voluntarily) work during a pandemic despite high personal risk. A wide diversity of opinion existed regarding resource allocation of ICU beds. These ethical issues require open debate to ensure U.K. pandemic plans are ethically acceptable and practically applicable.

Interprofessional education: effects on professional practice and health care outcomes.

BACKGROUND: Patient care is a complex activity which demands that health and social care professionals work together in an effective manner. The evidence suggests, however, that these professionals do not collaborate well together. Interprofessional education (IPE) offers a possible way to improve collaboration and patient care. OBJECTIVES: To assess the effectiveness of IPE interventions compared to education interventions in which the same health and social care professionals learn separately from one another; and to assess the effectiveness of IPE interventions compared to no education intervention. SEARCH STRATEGY: We searched the Cochrane Effective Practice and Organisation of Care Group specialised register, MEDLINE and CINAHL, for the years 1999 to 2006. We also handsearched the Journal of Interprofessional Care (1999 to 2006), reference lists of the six included studies and leading IPE books, IPE conference proceedings, and websites of IPE organisations. SELECTION CRITERIA: Randomised controlled trials (RCTs), controlled before and after (CBA) studies and interrupted time series (ITS) studies of IPE interventions that reported objectively measured or self reported (validated instrument) patient/client and/or healthcare process outcomes. DATA COLLECTION AND ANALYSIS: Two reviewers independently assessed the eligibility of potentially relevant studies, and extracted data from, and assessed study quality of, included studies. A meta-analysis of study outcomes was not possible given the small number of included studies and the heterogeneity in methodological designs and outcome measures. Consequently, the results are presented in a narrative format. MAIN RESULTS: We included six studies (four RCTs and two CBA studies). Four of these studies indicated that IPE produced positive outcomes in the following areas: emergency department culture and patient satisfaction; collaborative team behaviour and reduction of clinical error rates for emergency department teams; management of care delivered to domestic violence victims; and mental health practitioner competencies related to the delivery of patient care. In addition, two of the six studies reported mixed outcomes (positive and neutral) and two studies reported that the IPE interventions had no impact on either professional practice or patient care. AUTHORS' CONCLUSIONS: This updated review found six studies that met the inclusion criteria, in contrast to our first review that found no eligible studies. Although these studies reported some positive outcomes, due to the small number of studies, the heterogeneity of interventions, and the methodological limitations, it is not possible to draw generalisable inferences about the key elements of IPE and its effectiveness. More rigorous IPE studies (i.e. those employing RCTs, CBA or ITS designs with rigorous randomisation procedures, better allocation concealment, larger sample sizes, and more appropriate control groups) are needed to provide better evidence of the impact of IPE on professional practice and healthcare outcomes. These studies should also include data collection strategies that provide insight into how IPE affects changes in health care processes and patient outcomes.

A best evidence systematic review of interprofessional education: BEME Guide no. 9.

BACKGROUND AND REVIEW CONTEXT: Evidence to support the proposition that learning together will help practitioners and agencies work better together remains limited and thinly spread. This review identified, collated, analysed and synthesised the best available contemporary evidence from 21 of the strongest evaluations of IPE to inform the above proposition. In this way we sought to help shape future interprofessional education and maximize the potential for interprofessional learning to contribute to collaborative practice and better care. OBJECTIVES OF THE REVIEW: To identify and review the strongest evaluations of IPE. To classify the outcomes of IPE and note the influence of context on particular outcomes. To develop a narrative about the mechanisms that underpin and inform positive and negative outcomes of IPE. SEARCH STRATEGY: Bibliographic database searches as follows: Medline 1966-2003, CINAHL 1982-2001, BEI 1964-2001, ASSIA 1990-2003 which produced 10,495 abstracts. Subsequently, 884 full papers were obtained and scrutinized. In addition, hand searching (2003-5 issues) of 21 journals known to have published two or more higher quality studies from a previous review. TOPIC DEFINITION AND INCLUSION CRITERIA: Peer-reviewed papers and reports included in the review had to be formal educational initiatives attended by at least two of the many professional groups from health and social care, with the objective of improving care; and learning with, from and about each other. DATA COLLECTION, ANALYSIS AND SYNTHESIS: Standard systematic review procedures were applied for sifting abstracts, scrutinizing full papers and abstracting data. Two members of the team checked each abstract to decide whether the full paper should be read. A third member was consulted over any discrepancies. Similarly, each full paper was read by at least two members of the team and agreement sought before passing it to one member of the team (SR) for data abstraction. Other members of the team checked 10% of the abstraction records. Coding into a Statistical Package for Social Scientists (SPSS) data base led to collection of different outcome measures used in the primary studies via the common metric of an adapted Kirkpatrick's four-level model of educational outcomes. Additionally, a narrative synthesis was built after analysis of primary data with the 3-P model (presage-process-product) of education development and delivery. HEADLINE RESULTS: Government calls for enhanced collaboration amongst practitioners frequently leads to IPE that is then developed and delivered by educators, practitioners or service managers. Staff development is a key influence on the effectiveness of IPE for learners who all have unique values about themselves and others. Authenticity and customization of IPE are important mechanisms for positive outcomes of IPE. Interprofessional education is generally well received, enabling knowledge and skills necessary for collaborative working to be learnt; it is less able to positively influence attitudes and perceptions towards others in the service delivery team. In the context of quality improvement initiatives interprofessional education is frequently used as a mechanism to enhance the development of practice and improvement of services.

Raman spectroscopy: elucidation of biochemical changes in carcinogenesis of oesophagus.

Several techniques are under development to diagnose oesophageal adenocarcinoma at an earlier stage. We have demonstrated the potential of Raman spectroscopy, an optical diagnostic technique, for the identification and classification of malignant changes. However, there is no clear recognition of the biochemical changes that distinguish between the different stages of disease. Our aim is to understand these changes through Raman mapping studies. Raman spectral mapping was used to analyse 20-microm sections of tissue from 29 snap-frozen oesophageal biopsies. Contiguous haematoxylin and eosin sections were reviewed by a consultant pathologist. Principal component analysis was used to identify the major differences between the spectra across each map. Pseudocolour score maps were generated and the peaks of corresponding loads identified enabling visualisation of the biochemical changes associated with malignancy. Changes were noted in the distribution of DNA, glycogen, lipids and proteins. The mean spectra obtained from selected regions demonstrate increased levels of glycogen in the squamous area compared with increased DNA levels in the abnormal region. Raman spectroscopy is a highly sensitive and specific technique for demonstration of biochemical changes in the carcinogenesis of Barrett's oesophagus. There is potential for in vivo application for real-time endoscopic optical diagnosis.

Review article: screening and surveillance of Barrett's oesophagus: what is a cost-effective framework?

There is a strong association between symptomatic gastro-oesophageal reflux and oesophageal adenocarcinoma. With this in mind, the American College of Gastroenterology has recently revised its practice guidelines for the screening of patients with chronic gastro-oesophageal reflux disease (GERD) to identify those at risk of oesophageal adenocarcinoma, and recommends surveillance to identify curable oesophageal neoplasms in patients with established Barrett's oesophagus. Patients with chronic GERD symptoms, particularly those aged over 50 years, should undergo upper endoscopy. Patients found to have Barrett's oesophagus should be treated with acid suppression for GERD symptoms and then undergo regular surveillance endoscopy. Surveillance endoscopy every 3 years is recommended for those without dysplasia. For patients with verified low-grade dysplasia, yearly surveillance endoscopy is recommended. For those with focal high-grade dysplasia (defined as high-grade dysplastic changes involving fewer than five crypts), the condition may be followed with endoscopic surveillance performed at 3-month intervals. If there is verified, multifocal high-grade dysplasia, intervention (e.g. oesophagectomy) may be considered. Both observational and computer models suggest a benefit associated with screening and surveillance. Endoscopic screening and surveillance for Barrett's oesophagus compares favourably with mammography for the detection of breast cancer and other accepted medical practices.

The light solution for Barrett's oesophagus Photodiagnosis and photodynamic therapy for columnar-lined oesophagus.

BACKGROUND: Barrett's oesophagus is the columnar-lined metaplasia that occurs in response to severe gastro-oesophageal reflux and accounts for the dramatic rise in adenocarcinoma at the gastro-oesophageal junction. DIAGNOSTIC METHODS: Endoscopic recognition and pathological diagnosis of the condition is fraught with erroneous interpretation of the pre-malignant degeneration of dysplasia. Screening and surveillance programmes have yet to impact on the disease. Photodiagnosis by spectroscopy and imaging is under intense investigation. The methods can be divided into two groups of morphological (elastic scattering, optical coherence tomography) and molecular and biochemical (Raman and fluorescence). The major diagnostic problem remains the differentiation between inflammation and dysplasia. Raman spectroscopy does offer molecular-specific diagnosis and fibre-optic probes are being developed. The future appears to be multi-modal imaging combined with spectroscopy. RESULTS: Photodynamic therapy is a realistic option for the eradication of dysplastic Barrett's oesophagus. A recently reported randomised trial has demonstrated a significant improvement in the eradication of dysplasia and prevention of oesophageal cancer. CONCLUSIONS: Optical diagnosis and optical eradication have a bright future for the management of Barrett's oesophagus.