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1.
Am J Addict ; 33(4): 423-429, 2024 Jul.
Article in English | MEDLINE | ID: mdl-38430207

ABSTRACT

BACKGROUND AND OBJECTIVES: While inpatient withdrawal management/acute stabilization can improve outcomes for individuals with opioid use disorder (OUD), patients often leave treatment early due to mood, tension, and cravings associated with opioid withdrawal. The aim of this study was to evaluate the feasibility and preliminary effectiveness of a novel virtual reality (VR) based intervention; 3D Therapy Thrive (3DTT). METHODS: Subjects with OUD (N = 32) were recruited from a community acute stabilization program and received up to two sessions of 3DTT. They completed questionnaires related to their overall satisfaction with the experience and side effects; as well as those related to mood, tension, and cravings. RESULTS: There were no reported side effects and the majority of subjects (94%) reported high satisfaction with the experience. Out of 62 patients approached, 33 patients agreed to participate (53%) 33 patients completed one, and 17 of these patients (52%) completed both sessions of 3DTT, with 19 participants (58%) completing their treatment protocols. Compared to baseline, 3DTT participants reported significant reductions in depression, tension, and cravings (p's < 0.001). DISCUSSION AND CONCLUSIONS: This pilot study supports the feasibility and preliminary effectiveness of 3DTT for improving outcomes for inpatients with OUD. Future randomized controlled trials are necessary to evaluate the efficacy of 3DTT for improving retention, reducing cravings, and improving mood and tension. SCIENTIFIC SIGNIFICANCE: This is the first study to evaluate the feasibility of a psychologically informed VR intervention in inpatients with OUD.


Subject(s)
Inpatients , Opioid-Related Disorders , Virtual Reality , Humans , Pilot Projects , Male , Female , Adult , Opioid-Related Disorders/therapy , Opioid-Related Disorders/psychology , Inpatients/psychology , Substance Withdrawal Syndrome/psychology , Feasibility Studies , Middle Aged , Craving , Patient Satisfaction , Virtual Reality Exposure Therapy/methods
2.
Community Ment Health J ; 60(4): 722-742, 2024 05.
Article in English | MEDLINE | ID: mdl-38332393

ABSTRACT

Transitional age youth experiencing homelessness (TAY-EH) represent an underserved and understudied population. While an increasing number of empirical interventions have sought to address the high burden of psychopathology in this population, findings remain mixed regarding intervention effectiveness. In this systematic review of behavioral health interventions for TAY-EH, we sought to examine the structural framework in which these interventions take place and how these structures include or exclude certain populations of youth. We also examined implementation practices to identify how interventions involving youth and community stakeholders effectively engage these populations. Based on PRISMA guidelines, searches of Medline, PsycInfo, Embase, Cochrane Central, Web of Science, and ClinicalTrials.gov databases were conducted, including English language literature published before October 2022. Eligible studies reported on interventions for adolescent or young adult populations ages 13-25 years experiencing homelessness. The initial search yielded 3850 citations; 353 underwent full text review and 48 met inclusion criteria, of which there were 33 unique studies. Studies revealed a need for greater geographic distribution of empirically based interventions, as well as interventions targeting TAY-EH in rural settings. Studies varied greatly regarding their operationalizations of homelessness and their method of intervention implementation, but generally indicated a need for increased direct-street outreach in participant recruitment and improved incorporation of youth feedback into intervention design. To our knowledge, this is the first systematic review to examine the representation of various groups of TAY-EH in the literature on substance use and mental health interventions. Further intervention research engaging youth from various geographic locations and youth experiencing different forms of homelessness is needed to better address the behavioral health needs of a variety of TAY-EH.


Subject(s)
Ill-Housed Persons , Substance-Related Disorders , Young Adult , Humans , Adolescent , Mental Health
3.
J Addict Med ; 18(2): 180-184, 2024.
Article in English | MEDLINE | ID: mdl-38227855

ABSTRACT

OBJECTIVE: Increasing rates of methamphetamine (METH) use, use disorders, and related overdoses are a growing public health problem. There are a lack of protocols addressing METH intoxication and withdrawal symptoms that manifest during acute withdrawal treatment resulting in inpatient management difficulties and premature discharges. This report presents a novel treatment protocol comprised of behavior-targeted and pharmacological components that aims to reduce the intensity and duration of METH intoxication and withdrawal related symptoms during early treatment, improve retention, and provide clinicians with a tool to meet this growing problem. METHODS: The protocol was developed by a team of addiction physicians and other clinical staff. Clinical and administrative staff at a community acute stabilization unit were trained and the protocol was implemented with patients presenting with METH use. Pharmacological interventions, including ascorbic acid, antipsychotics, and other sedatives are discussed, as are behavior-based orders. A retrospective quality assurance examination was conducted on patient characteristics and outcomes as well as focus groups with nursing staff. RESULTS: A total of 23 patients consecutively admitted to the unit used the protocol (100% male). Most patients (67%) displayed symptoms of METH use or withdrawal. Behavior-related interventions were used in 52% of patients, while 48% received behavior-related and pharmacological measures. Patient completion of the protocol was 83%, and the protocol's utility was supported by nursing staff. CONCLUSIONS: This retrospective evaluation of a novel METH withdrawal treatment protocol suggests feasibility, tolerability, and preliminary evidence of effectiveness, providing clinicians with a new tool that requires further study.


Subject(s)
Amphetamine-Related Disorders , Central Nervous System Stimulants , Methamphetamine , Opioid-Related Disorders , Substance Withdrawal Syndrome , Humans , Male , Female , Retrospective Studies , Inpatients , Methamphetamine/adverse effects
4.
J Atten Disord ; 28(5): 751-790, 2024 Mar.
Article in English | MEDLINE | ID: mdl-38178649

ABSTRACT

INTRODUCTION: Executive function (EF) deficits are common in youth with ADHD and pose significant functional impairments. The extent and effect of interventions addressing EF in youth with ADHD remain unclear. METHODS: We conducted a systematic literature review using PRISMA guidelines. Included studies were randomized controlled trials of interventions to treat EF in youth with ADHD. RESULTS: Our search returned 136 studies representing 11,443 study participants. We identified six intervention categories: nonstimulant pharmacological (N = 3,576 participants), neurological (N = 1,935), psychological (N = 2,387), digital (N = 2,416), physiological (N = 680), and combination (N = 366). The bulk of the evidence supported pharmacological interventions as most effective in mitigating EF, followed by psychological and digital interventions. CONCLUSION: A breadth of treatments exists for EF in youth with ADHD. Pharmacological, psychotherapeutic, and digital interventions had the most favorable, replicable outcomes. A lack of outcome standardization across studies limited treatment comparison. More data on the persistence of intervention effects are necessary.


Subject(s)
Attention Deficit Disorder with Hyperactivity , Executive Function , Humans , Adolescent , Executive Function/physiology , Attention Deficit Disorder with Hyperactivity/drug therapy
5.
J Appl Clin Med Phys ; 25(6): e14269, 2024 Jun.
Article in English | MEDLINE | ID: mdl-38235952

ABSTRACT

INTRODUCTION: Dynamic tumor tracking (DTT) is a motion management technique where the radiation beam follows a moving tumor in real time. Not modelling DTT beam motion in the treatment planning system leaves an organ at risk (OAR) vulnerable to exceeding its dose limit. This work investigates two planning strategies for DTT plans, the "Boolean OAR Method" and the "Aperture Sorting Method," to determine if they can successfully spare an OAR while maintaining sufficient target coverage. MATERIALS AND METHODS: A step-and-shoot intensity modulated radiation therapy (sIMRT) treatment plan was re-optimized for 10 previously treated liver stereotactic ablative radiotherapy patients who each had one OAR very close to the target. Two planning strategies were investigated to determine which is more effective at sparing an OAR while maintaining target coverage: (1) the "Boolean OAR Method" created a union of an OAR's contours from two breathing phases (exhale and inhale) on the exhale phase (the planning CT) and protected this combined OAR during plan optimization, (2) the "Aperture Sorting Method" assigned apertures to the breathing phase where they contributed the least to an OAR's maximum dose. RESULTS: All 10 OARs exceeded their dose constraints on the original plan four-dimensional (4D) dose distributions and average target coverage was V100% = 91.3% ± 2.9% (ranging from 85.1% to 94.8%). The "Boolean OAR Method" spared 7/10 OARs, and mean target coverage decreased to V100% = 87.1% ± 3.8% (ranging from 80.7% to 93.7%). The "Aperture Sorting Method" spared 9/10 OARs and the mean target coverage remained high at V100% = 91.7% ± 2.8% (ranging from 84.9% to 94.5%). CONCLUSIONS: 4D planning strategies are simple to implement and can improve OAR sparing during DTT treatments. The "Boolean OAR Method" improved sparing of OARs but target coverage was reduced. The "Aperture Sorting Method" further improved sparing of OARs and maintained target coverage.


Subject(s)
Organs at Risk , Radiosurgery , Radiotherapy Dosage , Radiotherapy Planning, Computer-Assisted , Radiotherapy, Intensity-Modulated , Humans , Radiotherapy Planning, Computer-Assisted/methods , Radiotherapy, Intensity-Modulated/methods , Organs at Risk/radiation effects , Radiosurgery/methods , Liver Neoplasms/radiotherapy , Liver Neoplasms/diagnostic imaging , Respiration , Algorithms , Four-Dimensional Computed Tomography/methods , Movement
6.
J Fungi (Basel) ; 9(7)2023 Jul 19.
Article in English | MEDLINE | ID: mdl-37504748

ABSTRACT

Polyurethanes (PURs) are versatile polymers used in a wide variety of fields, such as the medical, automotive, textile, thermal insulation, and coating industries as well as many everyday objects. Many PURs have applications that require a long service life, sometimes with exposure to aggressive conditions. They can undergo different types of physicochemical and biological degradation, but they are not compostable, and many of them constitute persistent waste in the environment. Although both bacteria and fungi can be involved in the degradation of PURs, fungi are often the main biodegradation agents. The chemical structure of PURs determines their degree of biodegradation. Fungal biodegradation of PURs is linked to the production of enzymes, mainly esterases and proteases, alongside laccases, peroxidases, and tyrosinases, which can modify the structure of polyurethane compounds by forming carbonyl groups. The experimental analysis of the biodegradation of PUR can be carried out by bringing the polymer into contact with a mold in pure culture or with a microbial consortium. Then, global measurements can be taken, such as weight loss, tensile tests, or the ability of microorganisms to grow in the presence of PUR as the sole carbon source. The analysis of the chemical structure of the polymer and its degradation products after fungal growth can confirm biodegradation and specify the mechanism. The main avenues of future research are directed towards the development of fully biodegradable PURs and, on the contrary, towards the development of PURs that are more resistant to degradation phenomena, in particular biodegradation, for applications where the material is in contact with living organisms.

7.
J Med Phys ; 48(1): 50-58, 2023.
Article in English | MEDLINE | ID: mdl-37342609

ABSTRACT

Purpose and Aim: The Vero4DRT (Brainlab AG) linear accelerator is capable of dynamic tumor tracking (DTT) by panning/tilting the radiation beam to follow respiratory-induced tumor motion in real time. In this study, the panning/tilting motion is modeled in Monte Carlo (MC) for quality assurance (QA) of four-dimensional (4D) dose distributions created within the treatment planning system (TPS). Materials and Methods: Step-and-shoot intensity-modulated radiation therapy plans were optimized for 10 previously treated liver patients. These plans were recalculated on multiple phases of a 4D computed tomography (4DCT) scan using MC while modeling panning/tilting. The dose distributions on each phase were accumulated to create a respiratory-weighted 4D dose distribution. Differences between the TPS and MC modeled doses were examined. Results: On average, 4D dose calculations in MC showed the maximum dose of an organ at risk (OAR) to be 10% greater than the TPS' three-dimensional dose calculation (collapsed cone [CC] convolution algorithm) predicted. MC's 4D dose calculations showed that 6 out of 24 OARs could exceed their specified dose limits, and calculated their maximum dose to be 4% higher on average (up to 13%) than the TPS' 4D dose calculations. Dose differences between MC and the TPS were greatest in the beam penumbra region. Conclusion: Modeling panning/tilting for DTT has been successfully modeled with MC and is a useful tool to QA respiratory-correlated 4D dose distributions. The dose differences between the TPS and MC calculations highlight the importance of using 4D MC to confirm the safety of OAR doses before DTT treatments.

8.
J Pers Disord ; 37(1): 95-111, 2023 02.
Article in English | MEDLINE | ID: mdl-36723420

ABSTRACT

A substantial body of research supports dialectical behavior therapy (DBT) as an evidence-based treatment for those with borderline personality disorder (BPD); however, there remains a lack of mental health clinicians trained in this modality, resulting in limited clinician competencies and skills. Furthermore, the effectiveness of DBT trainings with mental health clinicians remains understudied. The present study evaluated a comprehensive 5-day DBT-Linehan Board of Certification training program. Informed by the Theory of Planned Behavior, this study assessed changes in clinician knowledge, attitudes, perceived behavioral control (PBC), intentions, and behaviors relevant to DBT at baseline, posttraining, and 6-month follow-up. Results showed large, significant pre-to-post training improvements in clinicians' knowledge, attitudes, PBC, and intentions related to DBT implementation. Large improvements in knowledge, attitudes, and PBC were sustained at follow-up. A significant improvement in actual behaviors was also found at follow-up. Implications of the present study and directions for future research are discussed.


Subject(s)
Borderline Personality Disorder , Community Mental Health Services , Dialectical Behavior Therapy , Humans , Dialectical Behavior Therapy/methods , Behavior Therapy/methods , Mental Health , Borderline Personality Disorder/therapy , Borderline Personality Disorder/psychology , Treatment Outcome
9.
Clin Colorectal Cancer ; 22(1): 120-128, 2023 03.
Article in English | MEDLINE | ID: mdl-36526537

ABSTRACT

INTRODUCTION: Stereotactic Ablative Radiation Therapy (SABR) is a therapeutic option for patients with inoperable oligometastatic colorectal carcinoma (CRC). Given the scarcity of prospective data on outcomes of SABR for metastatic CRC, this study aims to review SABR outcomes and determine predictive factors of local control (LC) and survival in patients with liver metastases from CRC. MATERIALS AND METHODS: A retrospective review of SABR for CRC liver metastases between 2011 and 2019 was undertaken. Endpoints included LC, overall survival (OS), progression-free survival (PFS) and time to restarting systemic therapy. Univariate (UVA) and multivariable analyses (MVA) were performed to identify predictive factors. RESULTS: Forty-eight patients were identified. The total number of tumors treated was 58. Median follow-up was 26.6 months. LC at 1, 2 and 3 years was 92.7%, 80.0%, and 61.2% respectively. Median time to local failure was 40.0 months (95% CI 31.8-76.1 months). Median OS was 31.9 months (95% CI 20.6-40.0 months). OS at 1, 2, and 3 years was 79.2%, 61.7%, and 44.9% respectively. Thirty-three patients (69%) restarted systemic therapy after completion of SABR. Median time to restarting chemotherapy was 11.0 months (95% CI 7.1-17.6 months). Systemic therapy free survival at 1, 2, and 3 years was 45.7%, 29.6%, and 22.6% respectively. On MVA, inferior LC was influenced by GTV volume ≥40 cm3 (HR: 3.805, 95% CI 1.376-10.521, P = .01) and PTV D100% BED <100 Gy10 (HR 2.971, 95% CI 1.110-7.953; P = .03). Inferior OS was associated with PTV volume ≥200 cm3 (HR 5.679, 95% CI 2.339-13.755; P < .001). CONCLUSION: SABR is an effective therapeutic option for selected patients with CRC liver metastases providing acceptable LC within the first 2 years. In many cases, it provides meaningful chemotherapy-free intervals. Higher biological effective doses are required to enhance LC.


Subject(s)
Colorectal Neoplasms , Liver Neoplasms , Radiosurgery , Humans , Prospective Studies , Radiosurgery/adverse effects , Progression-Free Survival , Retrospective Studies , Liver Neoplasms/radiotherapy , Colorectal Neoplasms/pathology
10.
J Appl Clin Med Phys ; 22(6): 16-25, 2021 Jun.
Article in English | MEDLINE | ID: mdl-34042251

ABSTRACT

PURPOSE: In this study we present a novel method for re-calculating a treatment plan on different respiratory phases by accurately modeling the panning and tilting beam motion during DTT (the "rotation method"). This method is used to re-calculate the dose distribution of a plan on multiple breathing phases to accurately assess the dosimetry. METHODS: sIMRT plans were optimized on a breath hold computed tomography (CT) image taken at exhale (BHexhale ) for 10 previous liver stereotactic ablative radiotherapy patients. Our method was used to re-calculate the plan on the inhale (0%) and exhale (50%) phases of the four-dimensional CT (4DCT) image set. The dose distributions were deformed to the BHexhale CT and summed together with proper weighting calculated from the patient's breathing trace. Subsequently, the plan was re-calculated on all ten phases using our method and the dose distributions were deformed to the BHexhale CT and accumulated together. The maximum dose for certain organs at risk (OARs) was compared between calculating on two phases and all ten phases. RESULTS: In total, 26 OARs were examined from 10 patients. When the dose was calculated on the inhale and exhale phases six OARs exceeded their dose limit, and when all 10 phases were used five OARs exceeded their limit. CONCLUSION: Dynamic tumor tracking plans optimized for a single respiratory phase leave an OAR vulnerable to exceeding its dose constraint during other respiratory phases. The rotation method accurately models the beam's geometry. Using deformable image registration to accumulate dose from all 10 breathing phases provides the most accurate results, however it is a time consuming procedure. Accumulating the dose from two extreme breathing phases (exhale and inhale) and weighting them properly provides accurate results while requiring less time. This approach should be used to confirm the safety of a DTT treatment plan prior to delivery.


Subject(s)
Lung Neoplasms , Neoplasms , Four-Dimensional Computed Tomography , Humans , Particle Accelerators , Radiotherapy Dosage , Radiotherapy Planning, Computer-Assisted , Respiration
11.
Materials (Basel) ; 15(1)2021 Dec 21.
Article in English | MEDLINE | ID: mdl-35009162

ABSTRACT

Nowadays, thermal regulation of the indoor environment is mandatory to reduce greenhouse gas emissions. The incorporation of Phase Change Materials (PCMs) and especially solid-solid PCMs (s/s PCMs) into building materials can be a major step forward in reducing energy consumption. Such materials are used for their high latent heat to save and release heat during phase change. To integrate these products in the fabrication of cementitious materials, it is essential to predict their influence on the rheological behaviour of construction materials. In this work, rheological measurements were carried out on composite suspensions made of cement or mortar plus s/s PCMs. Results showed that the fitting of the Herschel-Bulkley model with a constant value of flow exponent was reliable. The s/s PCMs influenced the consistency and the yield strength values, with the yield strength value being only slightly affected. The adaptation of an existing viscosity model is proposed to predict the consistency value of suspensions. Finally, an innovative approach to predict the flow behaviour is proposed and we highlight the research needs to mainstream the use of s/s PCMs in construction materials.

12.
Radiother Oncol ; 127(2): 253-258, 2018 May.
Article in English | MEDLINE | ID: mdl-29548561

ABSTRACT

TITLE: Cancer Trials Ireland (ICORG) 06-34: A multi-centre clinical trial using three-dimensional conformal radiation therapy to reduce the toxicity of palliative radiation for lung cancer. NCT01176487. BACKGROUND & PURPOSE: Trials of radiation therapy for the palliation of intra-thoracic symptoms from locally advanced non-small cell lung cancer (NSCLC) have concentrated on optimising fractionation and dose schedules. In these trials, the rates of oesophagitis induced by this "palliative" therapy have been unacceptably high. In contrast, this non-randomised, single-arm trial was designed to assess if more technically advanced treatment techniques would result in equivalent symptom relief and reduce the side-effect of symptomatic oesophagitis. MATERIALS & METHODS: Thirty-five evaluable patients with symptomatic locally advanced or metastatic NSCLC were treated using a three-dimensional conformal technique (3-DCRT) and standardised dose regimens of 39 Gy in 13 fractions, 20 Gy in 5 fractions or 17 Gy in 2 fractions. Treatment plans sought to minimise oesophageal dose. Oesophagitis was recorded during treatment, at two weeks, one month and three months following radiation therapy and 3-6 monthly thereafter. Mean dose to the irradiated oesophagus was calculated for all treatment plans. RESULTS: Five patients (14%) had experienced grade 2 oesophagitis or dysphagia or both during treatment and 2 other patients had these side effects at the 2-week follow-up. At follow-up of one month after therapy, there was no grade two or higher oesophagitis or dysphagia reported. 22 patients were eligible for assessment of late toxicity. Five of these patients reported oesophagitis or dysphagia (one had grade 3 dysphagia, two had grade 2 oesophagitis, one of whom also had grade 2 dysphagia). Quality of Life (QoL) data at baseline and at 1-month follow up were available for 20 patients. At 1-month post radiation therapy, these patients had slightly less trouble taking a short walk, less shortness of breath, did not feel as weak, had better appetite and generally had a better overall quality of life than they did at baseline. They did report being slightly more tired. CONCLUSIONS: This trial is the first of its kind showing that 3-DCRT provides patients with lower rates of oesophageal toxicity whilst yielding acceptable rates of symptom control. (Sponsored by Cancer Trials Ireland (ICORG) Study number 06-34, the Friends of St. Luke's and the St. Luke's Institute of Cancer Research.).


Subject(s)
Carcinoma, Non-Small-Cell Lung/radiotherapy , Esophagitis/prevention & control , Lung Neoplasms/radiotherapy , Radiation Injuries/prevention & control , Adult , Dose Fractionation, Radiation , Esophagitis/etiology , Female , Humans , Male , Palliative Care/methods , Quality of Life , Radiation Injuries/etiology , Radiotherapy Planning, Computer-Assisted/methods , Radiotherapy, Conformal/adverse effects , Radiotherapy, Conformal/methods
13.
J Dairy Sci ; 99(12): 9962-9973, 2016 Dec.
Article in English | MEDLINE | ID: mdl-27771090

ABSTRACT

This study investigated the effects of increased nutrient intake levels on prepubertal mammary parenchyma development in crossbreed (Holstein × Gyr) dairy heifers. Eighteen heifers age 3 to 4 mo were fed 1 of 3 nutrient intake levels (n=6 per treatment) designed to sustain an average daily gain of 0.0kg/d (maintenance, MA), 0.5kg/d (low gain, LG), or 1.0kg/d (high gain, HG). Serum blood samples collected on d 42 and 84 after a 12-h fast were analyzed for triglycerides, leptin, insulin, and insulin-like growth factor 1 (IGF-1). Liver and mammary parenchyma were biopsied on d 42 and harvested on d 84 for gene expression analysis. Parenchyma samples were also used for biochemical and histological analysis. Mammary parenchyma weight was lower in HG than in MA or LG heifers, but mammary extraparenchymal fat was greater in HG heifers than in other groups. Heifers fed the HG diet had a greater fraction of ether extract in their parenchyma than the others and a smaller fraction of crude protein in their parenchyma than MA heifers. Moreover, the HG and LG heifers had greater body fat mass than MA heifers. Nutrient intake level had no effect on the number of intraparenchymal adipocytes. Heifers fed the HG diet had greater serum IGF-1 than the others, and serum insulin was lower in the MA than the HG or LG heifers. Liver GHR, IGF1, and IGFBP3 mRNA expression was higher, but IGFBP2 mRNA was lower in HG heifers than in others. The parenchyma mRNA expression of lipogenic markers, such as CD36, ACCA, FASN, and ADIPOR1, was upregulated by nutrient intake level. Significant nutrient intake × time interactions for lipogenic genes during the experimental period indicated variable gene expression depending on the time point of prepubertal mammary gland development. Overall, our data suggest that enhancing nutrient intake increased body fat accumulation and lipogenesis in the mammary gland to the detriment of parenchyma growth. Moreover, increased lipogenesis in the parenchyma of HG heifers may indicate that fat accumulation occurred because of adipocyte hypertrophy and not differences in adipogenesis. The implications of these results for milk yield needs to be elucidated.


Subject(s)
Cattle/physiology , Diet/veterinary , Gene Expression Regulation , Liver/metabolism , Mammary Glands, Animal/growth & development , Animals , Cattle/genetics , Cattle/growth & development , Energy Intake , Female , Mammary Glands, Animal/metabolism , Parenchymal Tissue/growth & development , Parenchymal Tissue/metabolism , Random Allocation
14.
Transl Psychiatry ; 6: e780, 2016 Apr 12.
Article in English | MEDLINE | ID: mdl-27070408

ABSTRACT

In vivo structural neuroimaging can reliably identify changes to cortical morphology and its regional variation but cannot yet relate these changes to specific cortical layers. We propose, however, that by synthesizing principles of cortical organization, including relative contributions of different layers to sulcal and gyral thickness, regional patterns of variation in thickness of different layers across the cortical sheet and profiles of layer variation across functional hierarchies, it is possible to develop indirect morphological measures as markers of more specific cytoarchitectural changes. We developed four indirect measures sensitive to changes specifically occurring in supragranular cortical layers, and applied these to test the hypothesis that supragranular layers are disproportionately affected in schizophrenia. Our findings from the four different measures converge to indicate a predominance of supragranular thinning in schizophrenia, independent of medication and illness duration. We propose that these indirect measures offer novel ways of identifying layer-specific cortical changes, offering complementary in vivo observations to existing post-mortem studies.


Subject(s)
Cerebral Cortex/diagnostic imaging , Cerebral Cortex/pathology , Magnetic Resonance Imaging/methods , Schizophrenia/diagnostic imaging , Schizophrenia/pathology , Adult , Female , Humans , Male
15.
Int J Obes (Lond) ; 40(7): 1177-82, 2016 07.
Article in English | MEDLINE | ID: mdl-27089992

ABSTRACT

BACKGROUND: Although obesity is associated with structural changes in brain grey matter, findings have been inconsistent and the precise nature of these changes is unclear. Inconsistencies may partly be due to the use of different volumetric morphometry methods, and the inclusion of participants with comorbidities that exert independent effects on brain structure. The latter concern is particularly critical when sample sizes are modest. The purpose of the current study was to examine the relationship between cortical grey matter and body mass index (BMI), in healthy participants, excluding confounding comorbidities and using a large sample size. SUBJECTS: A total of 202 self-reported healthy volunteers were studied using surface-based morphometry, which permits the measurement of cortical thickness, surface area and cortical folding, independent of each other. RESULTS: Although increasing BMI was not associated with global cortical changes, a more precise, region-based analysis revealed significant thinning of the cortex in two areas: left lateral occipital cortex (LOC) and right ventromedial prefrontal cortex (vmPFC). An analogous region-based analysis failed to find an association between BMI and regional surface area or folding. Participants' age was also found to be negatively associated with cortical thickness of several brain regions; however, there was no overlap between the age- and BMI-related effects on cortical thinning. CONCLUSIONS: Our data suggest that the key effect of increasing BMI on cortical grey matter is a focal thinning in the left LOC and right vmPFC. Consistent implications of the latter region in reward valuation, and goal control of decision and action suggest a possible shift in these processes with increasing BMI.


Subject(s)
Body Mass Index , Brain Mapping , Gray Matter/pathology , Adolescent , Adult , Diffusion Tensor Imaging , Feeding Behavior , Female , Gray Matter/diagnostic imaging , Gray Matter/metabolism , Healthy Volunteers , Humans , Image Interpretation, Computer-Assisted , Magnetic Resonance Imaging , Male , Middle Aged , Neural Pathways/pathology , Overweight/complications , Overweight/pathology , Overweight/physiopathology , Young Adult
16.
J Dairy Res ; 82(1): 113-20, 2015 Feb.
Article in English | MEDLINE | ID: mdl-25592631

ABSTRACT

This study was conducted to evaluate the development of the mammary gland in Holstein heifers subjected to different dietary metabolisable protein (MP): metabolisable energy (ME) ratios. Twenty-five Holstein heifers (initial body weight (BW) 213±13·5 kg and initial average age 7·8±0·5 months) were divided into five treatments. The treatments were designed to provide MP:ME ratios equal to 33, 38, 43, 48, and 53 g of MP per Mcal of ME. All diets were formulated to have the same energy content (2·6 Mcal ME/kg dry matter). Actual MP:ME ratios were 36·2, 40·2, 46·2, 47·1, and 50·8 g MP/Mcal ME. The experiment was conducted in a randomised block design, while considering initial BW as a blocking factor to evaluate pre- and post-pubertal periods. Block effect was not observed for all variables evaluated; hence it was considered that the diets had the same influence both on pre- and post-pubertal phases. Dry matter and nutrient intake did not change between treatments, excepting protein intake and digestibility. Serum concentrations of insulin-like growth factor 1 increased linearly across treatments. Changes in the pixel brightness of mammary gland ultrasound images, which are associated with lipid content, were significantly influenced by MP:ME ratios in the diet of heifers that were subjected to accelerated growth rates. It is not recommended to use diets of less than 38 g MP/Mcal ME in diets to heifers allowed to gain more than 1 kg/d.


Subject(s)
Cattle/growth & development , Diet/veterinary , Dietary Proteins/administration & dosage , Energy Intake , Energy Metabolism , Mammary Glands, Animal/growth & development , Animal Feed , Animals , Body Weight , Cattle/metabolism , Dietary Proteins/metabolism , Female , Insulin-Like Growth Factor I/analysis , Lipids/analysis , Mammary Glands, Animal/chemistry , Mammary Glands, Animal/diagnostic imaging , Ultrasonography
17.
Ir Med J ; 97(7): 208-11, 2004.
Article in English | MEDLINE | ID: mdl-15490998

ABSTRACT

Although equitable access to services should be based on need, geographical location of patients and their clinicians can give rise to inequalities in healthcare delivery. Development of tele-medicine services can improve equity of access. The specialty of Clinical Neurophysiology (CN), currently under-developed in Ireland provides an example of such potential. This study aimed to determine the needs, expectations, and satisfaction of CN customers, namely patients and referring clinicians. The goal was to examine geographical impediments to access that might be addressed by the introduction of tele-neurophysiology. Two customer surveys were conducted: CN referring clinicians and CN patients. Thirty-one North Western Health Board (NWHB) consultant clinicians responded to a postal survey. Distance and delays caused by long waiting lists were felt to deter or make CN referral irrelevant. Ninety-seven percent believed the lack of a local service negatively impacts on patient management and 93% would welcome the introduction of a tele-neurophysiology service. The geographical location of patient's residence and/or the location of the referring clinician's practice influenced waiting lists for CN. Fifty-eight (105/182) percent of patients living in a region with a CN service compared to 39% (50/128) of those living in a region with no service received an appointment within one month. In addition to the current insufficient CN service capacity in Ireland, these surveys highlighted geographical inequities. Tele-neurophysiology has the potential to speed-up diagnosis, result in more patients being appropriately investigated and be fairer to patients.


Subject(s)
Consumer Behavior , Needs Assessment , Neurophysiology , Telemedicine , Health Services Accessibility , Humans , Ireland , Patients/psychology , Physicians/psychology , Surveys and Questionnaires
18.
Ir Med J ; 97(2): 46-9, 2004 Feb.
Article in English | MEDLINE | ID: mdl-15134269

ABSTRACT

No clinical neurophysiology (CN) service is currently provided by the North-Western Health Board (NWHB) region in Ireland. Digital technology associated with CN is compatible with tele-neurophysiology service development and may increase the efficiency of patient care in remote areas. This study was conducted to assess the need for CN in the NWHB with a view to implementing a tele-neurophysiology service for the region. A retrospective audit of investigations performed at six CN departments in Dublin compared patient groups from regions with (Eastern Regional Health Authority--ERHA) and without (NWHB) local CN departments. 4954 records were audited. CN activity was lower than internationally expected (ERHA group 52% of expected, NWHB group 23% of expected). The 2 groups differ in the specialty of referring clinician (p < 0.0001). NWHB patients are more likely to be referred by clinicians outside their region (p < 0.0001) and wait longer for appointment (p < 0.0001). While there is an unmet demand for CN services in Ireland generally, the population of the NWHB is further disadvantaged. Tele-neurophysiology has the potential to provide fairer access to CN services across the country. The data from this study provide a baseline against which the outcome of investment in CN can be monitored and evaluated.


Subject(s)
Neurophysiology , Telemedicine , Chi-Square Distribution , Humans , Ireland , Needs Assessment , Retrospective Studies
19.
J Palliat Med ; 1(3): 231-9, 1998.
Article in English | MEDLINE | ID: mdl-15859833

ABSTRACT

Our objectives were to determine medical housestaff exposure to the tasks of care after a death in the hospital and to characterize their practices, training, and attitudes toward this care. The study design was a review of hospital records and survey of housestaff at two academic medical centers. Forty-seven of 239 medical housestaff were surveyed. In one of the two hospitals studied, the number of death certificates completed by interns during 1 year was determined, and an estimate of exposure to hospital deaths and three other common discharge diagnoses during the same period was calculated. Housestaff were surveyed about the tasks of care after a death, including the determination of death, preparation of the body, notification of family, documentation, review of death with staff, and follow-up with family. Interns at one hospital completed a death certificate an average of 7 (range 1 to 13) times a year and were involved annually with approximately 30 inpatient deaths on ward teams. Exposure to a hospital death was comparable in frequency to that for pneumonia (48 cases/yr), congestive heart failure (32 cases/yr), or AIDS (24 cases/hr). Housestaff reported little or no formal training for the tasks of care after a death. Considerable variation among housestaff was noted in such routine tasks as how death was determined, discussions with the family, and providing bereavement care. Only 12% of respondents regularly reviewed personal reactions to a death with the medical team. In response to open-ended questioning, housestaff described significant distress and uncertainty regarding their roles in completing the tasks of care after a patient death. Medical housestaff are regularly exposed to hospital deaths, yet report minimal training, wide variations in practice, and significant distress with the performance of tasks after a death. We encourage greater attention to teaching about this important area of medical practice.

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