Perioperative intravenous contrast administration and the incidence of acute kidney injury after major gastrointestinal surgery: prospective, multicentre cohort study

BACKGROUND

This study aimed to determine the impact of preoperative exposure to intravenous contrast for CT and the risk of developing postoperative acute kidney injury (AKI) in patients undergoing major gastrointestinal surgery.

METHODS

This prospective, multicentre cohort study included adults undergoing gastrointestinal resection, stoma reversal or liver resection. Both elective and emergency procedures were included. Preoperative exposure to intravenous contrast was defined as exposure to contrast administered for the purposes of CT up to 7 days before surgery. The primary endpoint was the rate of AKI within 7 days. Propensity score-matched models were adjusted for patient, disease and operative variables. In a sensitivity analysis, a propensity score-matched model explored the association between preoperative exposure to contrast and AKI in the first 48 h after surgery.

RESULTS

A total of 5378 patients were included across 173 centres. Overall, 1249 patients (23·2 per cent) received intravenous contrast. The overall rate of AKI within 7 days of surgery was 13·4 per cent (718 of 5378). In the propensity score-matched model, preoperative exposure to contrast was not associated with AKI within 7 days (odds ratio (OR) 0·95, 95 per cent c.i. 0·73 to 1·21; P = 0·669). The sensitivity analysis showed no association between preoperative contrast administration and AKI within 48 h after operation (OR 1·09, 0·84 to 1·41; P = 0·498).

CONCLUSION

There was no association between preoperative intravenous contrast administered for CT up to 7 days before surgery and postoperative AKI. Risk of contrast-induced nephropathy should not be used as a reason to avoid contrast-enhanced CT.

Determination of Total, Saturated, Unsaturated, and Monounsaturated Fats in Cereal Products by Acid Hydrolysis and Capillary Gas Chromatography: Collaborative Study

Fifteen laboratories participated in a collaborative study to determine total, saturated, unsaturated, and monounsaturated fats in cereal products by gas chromatographic (GC) analysis of fatty acid methyl esters (FAMEs). Cereal products, representing a wide range of cereal grains and processes, were hydrolyxed in 8N HCI and extracted with ethyl and petroleum ethers. FAMEs were produced by the reaction of the mixed ether extracts with sodium hydroxide in methanol (NaOH/MeOH) and then with boron trifluoride reagent (14% BF3 in MeOH). They were quantitatively determined by capillary GC. Total fat was calculated as the sum of individual fatty acids expressed as triglyceride equivalents in accordance with nutrition labeling guidelines. Saturated, unsaturated, and monounsaturated fats were calculated as sums of individual fatty acids. The total fat contents of samples ranged from 0.56 to 12.64%. A split design was used to determine performance parameters of results obtained by 15 laboratories on 24 samples. Of the 24 samples, 7 were blind duplicates and 5 were independent materials. Statistical analysis for total fat yielded a relative standard deviation for repeatability (RSDr) range of 1.32 to 13.30% and a relative standard deviation for reproducibility (RSDr) range of 4.42 to 22.82%. The goal of this study was to determine total fat, saturated fat, unsaturated, and monounsaturated fat in cereal-based products by complete extraction, methylation, and quantitation of total fatty acids. The acid hydrolysis-capillary GC method for determining total, saturated, unsaturated, and monosaturated fats in cereal products has been adopted by AOAC INTERNATIONAL.

Determination of Vitamin B12 in Fortified Bovine Milk- Based Infant Formula Powder, Fortified Soya-Based Infant Formula Powder, Vitamin Premix, and Dietary Supplements by Surface Plasmon Resonance: Collaborative Study

A collaborative study was conducted on an inhibition-based protein-binding assay using the Biacore Q™ biosensor instrument and the Biacore Qflex™ Kit Vitamin B12 PI. The samples studied included infant formula, cereals, premixes, vitamin tablets, dietary supplements, and baby food. The collaborative study, which involved 11 laboratories, demonstrated that the assay showed an RSDr of 1.59–27.8 and HorRat values for reproducibility of 0.34–1.89 in samples with levels ranging from ppm to ppb. The assay studied is a label-free protein binding-based assay that uses the principle of surface plasmon resonance (SPR) to measure the interaction between vitamin B12 and a specifc binding protein. A Biacore Q biosensor uses this principle to detect binding directly at the surface of a sensor chip with a hydrophilic gold-dextran surface. The instrument passes a mixture of prepared sample extract and binding protein solution across a covalently immobilized vitamin B12 chip surface, and the response is given as free-binding protein as the mixture binds to the immobilized surface. This technique uses the specifcity and robustness of the protein-ligand interaction to allow minimal sample preparation and a wide range of matrixes to be analyzed rapidly. The reagents and accessories needed to perform this assay are provided as the ready-to-use format “Qflex Kit Vitamin B12 PI.” The method is intended for routine use in the quantitative determination of vitamin B12 (as cyanocobalamin) in a wide range of food products, dietary vitamin supplements, and multivitamin premixes.

Community infrastructure to boost social relations: a systematic review

Background

‘Boosting social relations’ in communities has been identified as a priority UK policy-related topic. An earlier scoping review identified evidence gaps in social relations & community infrastructure. We undertook a mixed method systematic review on this topic, which has potential for immediate practical impact.

Methods

A comprehensive search included 11 databases (1997-2017), grey literature and citation checking. Studies of interventions to improve or make alternative use of community or neighbourhood places, reporting outcomes of social relations, community wellbeing & related concepts were included. Established validity checklists. Qualitative data was synthesised thematically and a narrative synthesis was produced. GRADE and CERQual approaches were used to rate the overall strength of evidence for each outcome.

Results

51 included studies, mostly of poor to moderate quality, and mostly qualitative, provided moderate evidence that: Community hubs may promote social cohesion, increase social capital and build trust, widen social networks, increase interaction, and increase knowledge or skills;Changes to neighbourhood design may positively affect sense of belonging and pride in a community;Green and blue space interventions that provide the opportunity to participate in activities or meetings may improve social interactions, increase social networks, bonding and bridging social capital, physical activity and healthy eating, and improve people’s skills and knowledge.

There were also common themes relating to facilitators and barriers to successful interventions.

Conclusions

There is moderate evidence that a range of intervention approaches to community infrastructure can boost social relations and community wellbeing. Future research should prioritise high quality evaluations using repeated measures and validated tools, and robust and credible qualitative evidence.

Key messages

There is moderate evidence that a range of intervention approaches to community infrastructure can boost social relations and community wellbeing. Community hubs may promote social cohesion, increase social capital and build trust, widen social networks, increase interaction, and increase knowledge or skills.

Immunogenicity of a Staphylococcus aureus-cholera toxin A2/B vaccine for bovine mastitis

Staphylococcus aureus causes a chronic, contagious disease of the udder, or mastitis, in dairy cows. This infection is often refractory to antibiotic treatment, and has a significant economic impact on milk production worldwide. An effective vaccine to prevent S. aureus mastitis would improve animal health, reduce antibiotic dependence and inform human vaccine approaches. The iron-regulated surface determinant A (IsdA) and clumping factor A (ClfA) are conserved S. aureus extracellular-matrix adhesins and target vaccine antigens. Here we report the results of two bovine immunogenicity trials using purified IsdA and ClfA-cholera toxin A₂/B chimeras (IsdA-CTA₂/B and ClfA-CTA₂/B). Cows were intranasally inoculated with IsdA-CTA₂/B + ClfA-CTA₂/B at dry off and followed for 70 days. Trial 1 utilized three groups with one or two booster doses at a total concentration of 600 or 900 μg. Trial 2 utilized two groups with one booster at a total concentration of 1200 μg. Humoral immune responses in serum and milk were examined by ELISA. Responses in serum were significant between groups and provide evidence of antigen-specific IgG induction after vaccination in both trials. Cellular proliferation was detected by flow cytometry using antigen-stimulated PBMCs from day 60 of Trial 2 and revealed an increase in CD4+ T cells from vaccinated cows. IsdA and ClfA stimulation induced IL-4 expression, but not IFN-γ or IL-17, in PBMCs from day 60 as determined by cytokine expression analysis. Opsonophagocytosis of S. aureus confirmed the functional in vitro activity of anti-IsdA antibodies from Trial 2 serum and milk. The vaccine was well tolerated and safe, and results support the potential of mucosally-delivered CTA₂/B chimeras to protect cows from mastitis caused by S. aureus.

Medication adherence 1 month after hospital discharge in medical inpatients

BACKGROUND

The rate of medication non-adherence has been consistently reported to be between 20 and 50%. The majority of available data comes from international studies, and we hypothesised that a similar rate of adherence may be observed in Australian patients.

AIMS

To determine the rate of adherence to medications after discharge from acute general hospital admission and identify factors that may be associated with non-adherence.

METHODS

A prospective cohort study of 68 patients, comparing admission and discharge medication regimens to self-reported regimens 30-40 days after discharge from hospital. Patients were followed up via telephone call and univariate and multivariate binary logistic regression used to determine patient factors associated with non-adherence.

RESULTS

In all, 27 of 68 patients (39.7%) were non-adherent to one or more regular medications at follow up. Intentional and unintentional non-adherence contributed equally to non-adherence. Using multivariate analysis, presence of a carer responsible for medications was associated with significantly lower non-adherence (odds ratio (OR) 0.20 (0.05-0.83), P = 0.027) when adjusted for age, co-morbidities, chemist blister pack and total number of discharge medications.

CONCLUSIONS

Non-adherence to prescription medications is suboptimal and consistent with previous overseas studies. Having a carer responsible for medications is associated with significantly lower rates of non-adherence. Understanding patients' preferences and involving them in their healthcare may reduce intentional non-adherence.

Utilization of native oxygen in Eu(RE)-doped GaN for enabling device compatibility in optoelectronic applications

The detrimental influence of oxygen on the performance and reliability of V/III nitride based devices is well known. However, the influence of oxygen on the nature of the incorporation of other co-dopants, such as rare earth ions, has been largely overlooked in GaN. Here, we report the first comprehensive study of the critical role that oxygen has on Eu in GaN, as well as atomic scale observation of diffusion and local concentration of both atoms in the crystal lattice. We find that oxygen plays an integral role in the location, stability, and local defect structure around the Eu ions that were doped into the GaN host. Although the availability of oxygen is essential for these properties, it renders the material incompatible with GaN-based devices. However, the utilization of the normally occurring oxygen in GaN is promoted through structural manipulation, reducing its concentration by 2 orders of magnitude, while maintaining both the material quality and the favorable optical properties of the Eu ions. These findings open the way for full integration of RE dopants for optoelectronic functionalities in the existing GaN platform.

Homelessness and housing crises among individuals accessing services within a Canadian emergency department

ACCESSIBLE SUMMARY

Studies have indicated that individuals who are homeless access hospital emergency departments more frequently and may have different needs than individuals who are housed. Successful interventions have been developed and tested to reduce discharge to homelessness for psychiatric inpatients but have not been similarly tested for discharge from emergency departments. This study was developed to provide baseline data on this issue to inform future emergency department interventions. Findings from the current study suggest that discharge from emergency departments to homelessness happens frequently in London, Canada. Participants are unlikely to spontaneously disclose their housing/homelessness issue when first entering the emergency department, which may result in services that do not adequately meet their complex needs. Screening for housing issues is necessary within emergency departments and psychiatric crisis teams as housing issues may be a reason for accessing care or contribute to the presenting condition. Nurses are in an ideal position to evaluate housing needs among emergency department patients. Services outside of the emergency department are also needed to address housing issues, particularly outside of regular office hours.

ABSTRACT

Individuals who have mental health issues and are homeless or in housing crisis have been found to access emergency departments more frequently than individuals with stable housing. While emergency departments primarily focus on medical issues, homeless individuals may require psychosocial support as well. This study examined issues around housing crises and emergency department use for individuals with mental illness in Canada. Collecting baseline data about these issues is important to inform subsequent interventions. Administrative data from a hospital emergency department and psychiatric crisis service were collected, and five individuals accessing the emergency department for psychiatric reasons were interviewed. Results indicated that individuals with an identified housing crisis accessed the emergency department 930 times in 6 months. None of the interview participants identified housing as the primary reason for accessing the emergency department, but all noted that housing was a contributing stressor. Future research is needed to examine ways in which discharge to homelessness from emergency departments can be avoided and identify alternative services to address housing concerns, particularly for individuals with mental illness. Crisis service and emergency department staff, especially nurses, can play an important role in screening for housing issues and connecting individuals to outside services.

The CXCR4/CXCL12 axis in cutaneous malignancies with an emphasis on melanoma

The highly metastatic and variable behavior of melanoma has accentuated the need for early detection and targeted therapy. Putative targets identified include those belonging to the extensive network of chemokines and their receptors. One such target is the chemokine receptor CXCR4, a G protein-coupled receptor with a 34 amino acid extracellular N-terminus, the primary ligand of which is CXCL12 (SDF-1, stromal derived factor-1). The ligand uniquely utilizes the N-terminus of CXCR4 for signal transduction and stimulates the protein kinase B (AKT)/mitogen activated protein kinase (MAPK) pathway. Functionally, the CXCR4/CXCL12 axis is believed to play a key role in cell migration and proliferation. Upregulation of CXCR4 and consequently dysregulation of the CXCR4/CXCL12 axis has been implicated in the progression of several lineage-unrelated malignancies including melanoma. The contributions of the CXCR4/CXCL12 axis in melanomagenesis are well documented. More recently, the potential cooperativity between the mutational status of BRAF and the CXCR4/CXCL12 axis has been shown, lending credence to the concept that both CXCR4 and CXCL12 may be putative targets for therapy in melanoma. In this review, we summarize the role of the CXCR4/CXCL12 axis in cancer progression and metastasis, with an emphasis on cutaneous malignancy, melanoma in particular. Furthermore, we discuss the effects of CXCL12 on CXCR4 expressing malignant cells in vitro and the potential prognostic utility of both CXCR4 and CXCL12 expressions. Lastly, we highlight the therapeutic potential of targeting this axis and the unique response of CXCR4 expression to anti-cancer treatments with an emphasis on melanoma.

Transcriptomics of cortical gray matter thickness decline during normal aging

INTRODUCTION

We performed a whole-transcriptome correlation analysis, followed by the pathway enrichment and testing of innate immune response pathway analyses to evaluate the hypothesis that transcriptional activity can predict cortical gray matter thickness (GMT) variability during normal cerebral aging.

METHODS

Transcriptome and GMT data were available for 379 individuals (age range=28-85) community-dwelling members of large extended Mexican American families. Collection of transcriptome data preceded that of neuroimaging data by 17 years. Genome-wide gene transcriptome data consisted of 20,413 heritable lymphocytes-based transcripts. GMT measurements were performed from high-resolution (isotropic 800 μm) T1-weighted MRI. Transcriptome-wide and pathway enrichment analysis was used to classify genes correlated with GMT. Transcripts for sixty genes from seven innate immune pathways were tested as specific predictors of GMT variability.

RESULTS

Transcripts for eight genes (IGFBP3, LRRN3, CRIP2, SCD, IDS, TCF4, GATA3, and HN1) passed the transcriptome-wide significance threshold. Four orthogonal factors extracted from this set predicted 31.9% of the variability in the whole-brain and between 23.4 and 35% of regional GMT measurements. Pathway enrichment analysis identified six functional categories including cellular proliferation, aggregation, differentiation, viral infection, and metabolism. The integrin signaling pathway was significantly (p<10(-6)) enriched with GMT. Finally, three innate immune pathways (complement signaling, toll-receptors and scavenger and immunoglobulins) were significantly associated with GMT.

CONCLUSION

Expression activity for the genes that regulate cellular proliferation, adhesion, differentiation and inflammation can explain a significant proportion of individual variability in cortical GMT. Our findings suggest that normal cerebral aging is the product of a progressive decline in regenerative capacity and increased neuroinflammation.

P-selectin Expression Tracks Cerebral Atrophy in Mexican-Americans

Background and Purpose: We hypothesized that the P-selectin (SELP) gene, localized to a region on chromosome 1q24, pleiotropically contributes to increased blood pressure and cerebral atrophy. We tested this hypothesis by performing genetic correlation analyses for 13 mRNA gene expression measures from P-selectin and 11 other genes located in 1q24 region and three magnetic resonance imaging derived indices of cerebral integrity. Methods: The subject pool consisted of 369 (219F; aged 28–85, average = 47.1 ± 12.7 years) normally aging, community-dwelling members of large extended Mexican-American families. Genetic correlation analysis decomposed phenotypic correlation coefficients into genetic and environmental components among 13 leukocyte-based mRNA gene expressions and three whole-brain and regional measurements of cerebral integrity: cortical gray matter thickness, fractional anisotropy of cerebral white matter, and the volume of hyperintensive WM lesions. Results: From the 13 gene expressions, significant phenotypic correlations were only found for the P- and L-selectin expression levels. Increases in P-selectin expression levels tracked with decline in cerebral integrity while the opposite trend was observed for L-selectin expression. The correlations for the P-selectin expression were driven by shared genetic factors, while the correlations with L-selectin expression were due to shared environmental effects. Conclusion: This study demonstrated that P-selectin expression shared a significant variance with measurements of cerebral integrity and posits elevated P-selectin expression levels as a potential risk factor of hypertension-related cerebral atrophy.

Diabetes Medication Assistance Service Stage 1: impact and sustainability of glycaemic and lipids control in patients with Type 2 diabetes

AIMS

To investigate (i) optimal intensity (four visits vs. six visits) and duration (6 vs. 12 months) of the Diabetes Medication Assistance Service in community pharmacy and (ii) sustainability of improvements in patients' diabetes control associated with differing intensities of intervention.

METHODS

A national quota sample of 90 community pharmacies in Australia were randomly assigned into group 1 (6-month Diabetes Medication Assistance Service) or group 2 (12-month Diabetes Medication Assistance Service) and subsequently recruited a total of 524 patients. A wide range of clinical (HbA(1c) , blood pressure, lipids) and quality-of-life outcome measures were assessed.

RESULTS

The 6- and 12-month Diabetes Medication Assistance Service resulted in significant and similar reductions in HbA(1c) (-0.9 mmol/mol; 95% CI -0.7 to -1.1) -, total cholesterol (-0.3 mmol/l; 95% CI -0.1 to -0.4) and triglycerides (-0.3 mmol/l; 95% CI -0.1 to -0.5). There was also a significant reduction in the number of patients who were at risk of having a cardiovascular event in the next 10 years. For the subset of patients for whom data were available at baseline, completion and 18 months, improvements in HbA(1c) and total cholesterol were sustained at 18 months and triglycerides showed a further improvement at 18 months.

CONCLUSIONS

The Diabetes Medication Assistance Service resulted in significant improvements in diabetes control that were independent of intensity and duration of the service and showed evidence of being sustained at 18 months. The extent and sustainability of clinical improvements achieved by the Diabetes Medication Assistance Service, together with the resulting reduction in cardiovascular risk, should translate into future cost savings to healthcare systems by delaying and reducing diabetes-related complications.

Renal accumulation of biglycan and lipid retention accelerates diabetic nephropathy

Hyperlipidemia worsens diabetic nephropathy, although the mechanism by which renal lipids accumulate is unknown. We previously demonstrated that renal proteoglycans have high low-density lipoprotein (LDL) binding affinity, suggesting that proteoglycan-mediated LDL retention may contribute to renal lipid accumulation. The aim of this study was to determine the relative effect of diabetes and hyperlipidemia on renal proteoglycan content. Diabetic and non-diabetic LDL receptor-deficient mice were fed diets containing 0% or 0.12% cholesterol for 26 weeks, and then kidneys were analyzed for renal lipid and proteoglycan content. Diabetic mice on the high-cholesterol diet had accelerated development of diabetic nephropathy with elevations in urine albumin excretion, glomerular and renal hypertrophy, and mesangial matrix expansion. Renal lipid accumulation was significantly increased by consumption of the 0.12% cholesterol diet, diabetes, and especially by both. The renal proteoglycans biglycan and decorin were detectable in glomeruli, with a significant increase in renal biglycan content in diabetic mice on the high-cholesterol diet. Renal biglycan and renal apolipoprotein B were colocalized, and regression analyses showed a significant relation between renal biglycan and renal apolipoprotein B content. The increased renal biglycan content in diabetic nephropathy probably contributes to renal lipid accumulation and the development of diabetic nephropathy.

Diabetes management in an Australian primary care population

WHAT IS KNOWN AND OBJECTIVE

Worldwide studies have shown that significant proportions of patients with type 2 diabetes (T2DM) do not meet targets for glycaemic control, blood pressure (BP) and lipids, putting them at higher risk of developing complications. However, little is known about medicines management in Australian primary care populations with T2DM. The aim of this study was to (i) describe the management of a large group of patients in primary care, (ii) identify areas for improvement in management and (iii) determine any relationship between adherence and glycaemic, BP and lipid control.

METHODS

This was a retrospective, epidemiological study of primary care patients with T2DM diabetes, with HbA(1c) of >7%, recruited in 90 Australian community pharmacies. Data collected included demographic details, diabetes history, current medication regimen, height, weight, BP, physical activity and smoking status.

RESULTS AND DISCUSSION

Of the 430 patients, 98% used antidiabetics, 80% antihypertensives, 73% lipid lowering drugs and 38% aspirin. BP and all lipid targets were met by only 21% and 14% of the treated patients and 21% and 12% of the untreated patients respectively. Medication adherence was related to better glycaemic control (P = 0.04).

WHAT IS NEW AND CONCLUSIONS

An evidence-base prescribing practice gap was seen in this Australian primary care population of T2DM patients. Patients were undertreated with antihypertensive and lipid lowering medication, and several subgroups with co-morbidities were not receiving the recommended pharmacotherapy. Interventions are required to redress the current evidence-base prescribing practice gap in disease management in primary care.

FC27-01 - Youth matters in London: Mental health, addiction and homelessness

This project will work closely with existing service partners involved in street level services and focus on testing and evaluating three approaches for street level interventions for youth who are homeless and who have severe or moderate mentally illness. Youth will be asked to choose their preferred service approach:

Housing First related initiatives focused on interventions designed to move youth to appropriate and available housing and ongoing housing supports.

Treatment First initiatives to provide Mental Health/Addiction supports and treatment solutions, and; Simultaneous attention to both Housing and Treatment Together

Our primary objective is to understand the service delivery preferences of homeless youth and understand the outcomes of these choices. Our research questions include:1.

Focus groups with staff and family members will occur to assist in understanding the nature of each of service approach, changes that evolve within services, & facilitators and barriers to service delivery. This work will be important in determining which approach is chosen by youth and why. Evaluating the outcomes with each choice will provide valuable information about outcomes for the service options chosen by youth. This assist in better identifying weaknesses in the services offered and inform further development of treatment options that youth will accept.

Hepatic capillariasis in a Cape ground squirrel (Xerus inaurus)

We report, for the first time, an incidental finding of Calodium hepaticum infestation in a sub-adult female Cape ground squirrel (Xerus inaurus). Post mortem examination of the squirrel revealed severe haemoperitoneum, splenomegaly and hepatomegaly with miliary white spots distributed diffusely throughout the hepatic parenchyma. Histologically the portal tracts in the liver showed granulomatous inflammation with fibrosis and numerous giant cells. Occasional adult worms were identified and there were multiple C. hepaticum eggs distributed diffusely throughout the portal tracts and the parenchyma. The spleen also contained C. hepaticum eggs. The genus Rattus is the primary host and reservoir of C. hepaticum, but C. hepaticum infections have been reported previously in other Sciuridae. Based on our findings, people should be cautious of the zoonotic potential of C. hepaticum, when they come into contact with the Cape ground squirrel.

The contractile deceleration point: an important physiologic landmark on oesophageal pressure topography

BACKGROUND

This study aimed to correlate oesophageal bolus transit with features of oesophageal pressure topography (OPT) plots and establish OPT metrics for accurately measuring peristaltic velocity.

METHODS

About 18 subjects underwent concurrent OPT and fluoroscopy studies. The deglutitive Contractile Front Velocity (CFV) in OPT plots was subdivided into an initial fast phase (CFV(fast)) and subsequent slow phase (CFV(slow)) separated by a user-defined deceleration point (CDP). Fluoroscopy studies were analyzed for the transition from the initial rapidly propagated luminal closure associated with peristalsis to slow bolus clearance characteristic of phrenic ampullary emptying and to identify the pressure sensors at the closure front and at the hiatus. Oesophageal pressure topography measures were correlated with fluoroscopic milestones of bolus transit. Oesophageal pressure topography studies from another 68 volunteers were utilized to develop normative ranges for CFV(fast) and CFV(slow).

KEY RESULTS

A distinct change in velocity could be determined in all 36 barium swallows with the fast and slow contractile segments having a median velocity of 4.2 cm s(-1) and 1.0 cm s(-1), respectively. The CDP noted on OPT correlated closely with formation of the phrenic ampulla making CFV(fast) (mean 5.1 cm s(-1)) correspond closely to peristaltic propagation and CFV(slow) (mean 1.7 cm s(-1)) to ampullary emptying.

CONCLUSIONS & INFERENCES

The deceleration point in the CFV on OPT plots accurately demarcated the early region in which the CFV reflects peristaltic velocity (CFV(fast)) from the later region where it reflects the progression of ampullary emptying (CFV(slow)). These distinctions should help objectify definitions of disordered peristalsis, especially spasm, and improve understanding of impaired bolus transit across the oesophagogastric junction.