Behaviour of occupational health services during the COVID-19 pandemic.

BACKGROUND: Disasters, crises and pandemics are emergencies which impact on businesses severely. The COVID-19 pandemic reached its peak in mid-April 2020 in the UK. During this period, NHS Occupational Health Services (OHS) were stretched to their limit along with other health services. OHS may have had to change their pattern of operation, operating times, services offered, etc. to cope with the pandemic. Data about business model modifications, services offered by the OHS businesses during the pandemic could help in better utilization of OHS resources in the future. AIMS: To understand the behaviour of OHS in different parts of the country during the COVID-19 pandemic. METHODS: An online survey link was sent to both accredited and unaccredited UK Occupational Health Physicians (OHPs). RESULTS: Sixty-two OHPs responded to the survey. In the current pandemic, 51% of the OHS (95% CI 0.38-0.62) offered weekend or out-of-hours (OOH) services, 21% had to employ extra staff (95% CI 0.13-0.33) and 54% had to change their working hours (95% CI 0.41-0.65). Ninety per cent of the OHS (95% CI 0.78-0.94) continued to offer routine services; however, there was a decline in offering vaccination services. Fifty-six per cent of the OHS (95% CI 0.42-0.67) offered a dedicated telephone line and 46% of the OHS (95% CI 0.32-0.56) started a dedicated COVID-19 queries inbox. CONCLUSIONS: There was a change in the behaviour of the OHS to cope with the pandemic. Having a dedicated helpline to manage the crisis situation seemed a logical step whilst offering routine services.

Use of published sickness absence guidelines by human resources professionals.

BACKGROUND: Sickness absence causes organizational and economic pressures on employers. Professional organ izations have published guidelines to inform managers of the likely period of time off work resulting from common surgical operations and medical conditions. AIMS: To investigate how human resources professionals (HRPs) determine the expected length of time off work associated with common medical or surgical conditions. METHODS: We sent a hyperlink to an internet-based structured closed-ended survey to a cohort of HRPs consisting of all HRPs from organizations with a current contract with an National Health Service Foundation Trust Occupational Health (OH) department. RESULTS: Of 47 HRPs, 32 responded (68%). Most of the respondents (84%) used the general practitioner's 'fit note' (Med3) as a guide to likely time off work and 47% also used personal experience. Twenty-five per cent were aware of medical guidelines on time off work and 19% referred to these guidelines, although 50% of these had last done so >6 months ago. Eighty-seven per cent of HRPs thought the guidelines were easy to interpret and 75% would recommend them to others. However, 75% referred employees to the OH department for advice on sickness absence. CONCLUSIONS: A high proportion of HRPs used information from the 'fit note' to make decisions about sickness absence duration. In addition, most referred employees to the OH department for advice on the expected length of time off work.

SU-E-T-211: Peer Review System for Ensuring Quality of Radiation Therapy Treatments.

PURPOSE: To demonstrate a Web-based electronic peer review system that has the potential to improve quality of care for radiation therapy patients. The system provides tools that allow radiation oncologists to seek peer review of target and critical structure delineation, treatment plans, and share clinical data with peers to optimize radiation therapy treatments. MATERIAL AND METHODS: Peer review of radiation therapy treatment planning data prior to its initiation improves the quality of radiation therapy and clinical outcomes. Web-based access to radiation therapy treatment planning data and medical records mitigate existing geographical and temporal constraints. With internet access, the healthcare provider can access the data from any location and review it in an interactive and collaborative manner. Interoperability standard like DICOM-RT and IHE-RO compliant RT Systems have facilitated the design and implementation of PRS with Silverlight Web technology, .net Framework and SQL Server. Local DICOM-RT archive and cloud based services are deployed to facilitate remote peer reviews. RESULTS: To validate the PRS system, we tested the system for 100 patients with Philips Pinnacle v 9.0 and Varian Eclipse v 8.9 treatment planning system (TPS). We transmitted the DICOM RT data from the TPS to the cloud based services via the PRS local DICOM RT Archive. Various CT simulation based parameters such as orientation of CT, properties of RT structures etc. were compared between the TPS and PRS system. Data integrity of other parameters such as patient demographics (patient name, ID, attending physician etc.) and dose volume related parameters were also evaluated. Such rigorous testing allowed us to optimize the functionalities and clinical implementation of the PRS. CONCLUSIONS: We believe that the PRS will improve the quality and safety of a broad spectrum of radiation therapy patients treated in underserved areas while discouraging the overutilization of expensive radiation treatment modalities. This research and development project is supported by the James and Ester King Biomedical Research Program grant # RC1-09KW-09-26829.

Development of a food frequency questionnaire for the assessment of quercetin and naringenin intake.

OBJECTIVES: To measure the relationship between quercetin and naringenin intakes as estimated by food frequency questionnaire (FFQ), and the urinary excretion of quercetin and naringenin aglycones after their enzymatic hydrolysis in human volunteers. SUBJECTS AND METHODS: Volunteers were recruited via the Human Nutrition Unit volunteer databank at the Institute of Food Research, Norwich. Sixty-three volunteers were recruited into the study, of which 14 were excluded and 49 completed the study. A modified FFQ was developed and used to estimate daily intake of quercetin and naringenin in 49 healthy volunteers who also provided five 24-h urine samples over a 2-week period. Urinary excretion of quercetin and naringenin metabolites was determined by solid-phase extraction and high-pressure liquid chromatography. RESULTS: The estimated mean intakes of quercetin and naringenin were 29.4 mg (s.d. 15.0) and 58.1 mg (s.d. 62.7) per day, respectively. Mean urinary excretion of quercetin was 60.1 microg (s.d. 33.1) and that of naringenin was 0.56 mg (s.d. 0.4). The correlation between FFQ estimated intake of quercetin and naringenin and levels excreted in the urine were r=0.82 (P<0.0001) and r=0.25 (P=0.05), respectively. CONCLUSIONS: We observed a statistically significant correlation between the urinary excretion of quercetin and naringenin metabolites and their dietary intake as estimated by FFQ. Use of FFQs in epidemiological studies requiring an estimate of flavonoid intake seems justified.

Who should perform laparoscopic cholecystectomy? A 10-year audit.

BACKGROUND: Laparoscopic cholecystectomy is one of the most common operations in general surgery. It is performed by surgeons with a specialist interest in biliary disease as well as by surgeons with other specialist interests. METHODS: This retrospective audit of all cholecystectomies was conducted in a single hospital over a 10-year period from 1996 to 2005. Data were extracted from two independent electronic databases and supplemented by a full note review of cases with extended postoperative stay or unplanned readmission. The outcomes for cases under the care of specialist upper gastrointestinal (GI) consultants were compared with outcomes for cases of general surgery consultants from other firms. RESULTS: Data from 4,139 cholecystectomies were obtained. More cholecystectomies performed by upper GI firms were completed laparoscopically (96.2% vs 80.1%) with a higher rate of intraoperative cholangiograms (83.4% vs 16.9%). The mean operating time was shorter for upper GI cases (69 vs 84 min), as was the postoperative hospital stay (2 vs 3.6 days). There also was a significantly lower incidence of bile duct injury in upper GI cases (0.1% vs 0.9%). CONCLUSION: In their institution, the authors found evidence of improved outcomes when laparoscopic cholecystectomy was performed under the care of surgeons with a specialist interest in upper GI or hepatopancreaticobiliary surgery.

Kimura's disease.

A 12 year old child developed primary unilateral cervical mass. Routine investigations were inconclusive except cosinophibilia. Excision biopsy revealed the diagonisis as Kimura's Disease. Retrospective investigations confirmed it. This disease should be suspected when a patient presents with tetrad of painless unilateral cervical lymphodenopathy. Eosinophilia, Hyperimmunoglobulimemia (††/gE) & Positive Candida Specific Antibodies. A flow chart has been drawn to treat this condition after review of literature.

Self-bougienage: long-term relief of corrosive esophageal strictures.

BACKGROUND: Corrosive esophageal strictures require dilatation at frequent intervals. OBJECTIVE: To determine the efficacy of self-dilatation in treatment of corrosive esophageal strictures. METHODS: Retrospective analysis of data from 51 patients with corrosive esophageal strictures seen in a surgical unit. Eighteen patients underwent per-oral antegrade dilatation of stricture using gum elastic bougies (Group I); 15 patients underwent retrograde dilatation with endless string using an India rubber dilator devised at the authors' institution, followed by per-oral antegrade dilatation (Group II); 15 patients underwent retrograde dilatation followed by antegrade dilatation with endless string through esophagostomy (Group III). In three patients with stricture of the entire esophagus, endless string could not be passed; they were subjected to esophagocoloplasty. All patients were taught self-dilatation with gum elastic bougies as the final step, and were put on a progressive, domiciliary, self-dilatation program. Quarterly follow up was done for one year, to ascertain whether self-bougienage was being performed properly. RESULTS: All patients responded well to treatment, with significant relief of dysphagia and improvement in health and barium study findings. Six patients developed mediastinitis (3, 2 and 1 in Groups I, II and III, respectively) during initial dilatation; all improved with conservative management. Only one patient who failed to carry out self-bougienage had to be readmitted and retrained in the procedure, after which he remained asymptomatic. CONCLUSIONS: Patients with corrosive esophageal strictures can be treated with a long-term self-bougienage program, which avoids the need for frequent hospital admissions for esophageal dilatation.

An algorithm for automatic, computed-tomography-based source localization after prostate implant.

Permanent implant of the prostate using I-125 and Pd-103 seeds is a popular choice of treatment for early-stage prostate cancer in the United States. Evaluation of the quality of the implant is best based on the calculated dose distribution from postimplant computed tomography (CT) images. This task, however, has been time-consuming and inaccurate. We have developed an algorithm for automatic source localization from postimplant CT images. The only requirement of this algorithm is knowledge of the number of seeds present in the prostate, thus minimizing the need for human intervention. The algorithm processes volumetric CT data from the patient, and pixels of higher CT numbers are categorized into classes of definite and potential source pixels. A multithresholding technique is used to further determine the number of seeds and their precise locations in the CT volume data. A graphic user interface was developed to facilitate operator review of and intervention in the calculation and the results of the algorithm. This algorithm was tested on two phantoms containing nonradioactive seeds, one with 20 seeds in discrete locations and another with 100 seeds with small distances between seeds. The tests showed that the algorithm was able to identify the seed locations to within 1 mm of their physical locations for discrete seed locations. It was further able to separate seeds at close proximity to each other while maintaining an average seed localization error of less than 2 mm, with no operator intervention required.

Modified mesh rectopexy: a study.

AIM: To evaluate the efficacy of modified mesh rectopexy for complete rectal prolapse. SUBJECT AND METHODS: In a prospective study between 1989-1998, 47 patients (25 males and 22 females) underwent modified mesh rectopexy using a "Cross-shaped" knitted monofilament polypropylene. They were followed up for a period of four years postoperatively. RESULTS: Anatomical repair was achieved in all patients. Preoperative constipation, a complaint in 22 patients, was relieved in 13 patients and need for laxatives decreased in another four. There were no new cases of constipation. Sexual functions were not hampered irrespective of gender. The complications included prolonged ileus (4 patients), faecal impaction (1), partial mucosal prolapse (2) and post-operative obstruction (2). There was no recurrence. CONCLUSION: This technique aligns the rectum, avoids excessive mobilisation and division of lateral ligaments thus preventing constipation and preserving potency. We recommend this technique for patients with complete rectal prolapse with up to grade 1, 2 and 3 incontinence based on Browning and Parks classification.

Efficient classification for multiclass problems using modular neural networks.

The rate of convergence of net output error is very low when training feedforward neural networks for multiclass problems using the backpropagation algorithm. While backpropagation will reduce the Euclidean distance between the actual and desired output vectors, the differences between some of the components of these vectors increase in the first iteration. Furthermore, the magnitudes of subsequent weight changes in each iteration are very small, so that many iterations are required to compensate for the increased error in some components in the initial iterations. Our approach is to use a modular network architecture, reducing a K-class problem to a set of K two-class problems, with a separately trained network for each of the simpler problems. Speedups of one order of magnitude have been obtained experimentally, and in some cases convergence was possible using the modular approach but not using a nonmodular network.

An improved algorithm for neural network classification of imbalanced training sets.

The backpropagation algorithm converges very slowly for two-class problems in which most of the exemplars belong to one dominant class. An analysis shows that this occurs because the computed net error gradient vector is dominated by the bigger class so much that the net error for the exemplars in the smaller class increases significantly in the initial iteration. The subsequent rate of convergence of the net error is very low. A modified technique for calculating a direction in weight-space which decreases the error for each class is presented. Using this algorithm, the rate of learning for two-class classification problems is accelerated by an order of magnitude.

Prediction criteria for successful weaning from respiratory support: statistical and connectionist analyses.

OBJECTIVE: To develop predictive criteria for successful weaning of patients from mechanical assistance to ventilation, based on simple clinical tests using discriminant analyses and neural network systems. DESIGN: Retrospective development of predictive criteria and subsequent prospective testing of the same predictive criteria. SETTING: Medical ICU of a 300-bed teaching Veterans Administration Hospital. PATIENTS: Twenty-five ventilator-dependent elderly patients with acute respiratory failure. INTERVENTIONS: Routine measurements of negative inspiratory force, tidal volume, minute ventilation, respiratory rate, vital capacity, and maximum voluntary ventilation, followed by a weaning trial. Success or failure in 21 efforts was analyzed by a linear and quadratic discriminant model and neural network formulas to develop prediction criteria. The criteria developed were tested for predictive power prospectively in nine trials in six patients. RESULTS: The statistical and neural network analyses predicted the success or failure of weaning within 90% to 100% accuracy. CONCLUSION: Use of quadratic discriminant and neural network analyses could be useful in developing accurate predictive criteria for successful weaning based on simple bedside measurements.

Bounds on the number of samples needed for neural learning.

The relationship between the number of hidden nodes in a neural network, the complexity of a multiclass discrimination problem, and the number of samples needed for effect learning are discussed. Bounds for the number of samples needed for effect learning are given. It is shown that Omega(min (d,n) M) boundary samples are required for successful classification of M clusters of samples using a two-hidden-layer neural network with d-dimensional inputs and n nodes in the first hidden layer.