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Journal of Medical Genetics Nov 2021Phenome-wide association study (PheWAS) has been increasingly used to identify novel genetic associations across a wide spectrum of phenotypes. This systematic review... (Review)
Review
Phenome-wide association study (PheWAS) has been increasingly used to identify novel genetic associations across a wide spectrum of phenotypes. This systematic review aims to summarise the PheWAS methodology, discuss the advantages and challenges of PheWAS, and provide potential implications for future PheWAS studies. Medical Literature Analysis and Retrieval System Online (MEDLINE) and Excerpta Medica Database (EMBASE) databases were searched to identify all published PheWAS studies up until 24 April 2021. The PheWAS methodology incorporating how to perform PheWAS analysis and which software/tool could be used, were summarised based on the extracted information. A total of 1035 studies were identified and 195 eligible articles were finally included. Among them, 137 (77.0%) contained 10 000 or more study participants, 164 (92.1%) defined the phenome based on electronic medical records data, 140 (78.7%) used genetic variants as predictors, and 73 (41.0%) conducted replication analysis to validate PheWAS findings and almost all of them (94.5%) received consistent results. The methodology applied in these PheWAS studies was dissected into several critical steps, including quality control of the phenome, selecting predictors, phenotyping, statistical analysis, interpretation and visualisation of PheWAS results, and the workflow for performing a PheWAS was established with detailed instructions on each step. This study provides a comprehensive overview of PheWAS methodology to help practitioners achieve a better understanding of the PheWAS design, to detect understudied or overstudied outcomes, and to direct their research by applying the most appropriate software and online tools for their study data structure.
Topics: Data Visualization; Genome-Wide Association Study; Humans; Phenotype; Polymorphism, Single Nucleotide; Quality Control; Sample Size; Software
PubMed: 34272311
DOI: 10.1136/jmedgenet-2021-107696 -
Reproductive Health Feb 2024Polycystic ovary syndrome (PCOS) is a common condition in women, characterised by reproductive and metabolic dysfunction. While dietary approaches have been evaluated as... (Meta-Analysis)
Meta-Analysis Review
INTRODUCTION
Polycystic ovary syndrome (PCOS) is a common condition in women, characterised by reproductive and metabolic dysfunction. While dietary approaches have been evaluated as a first-line treatment for patients with PCOS, there is limited evidence to support preference for a specific dietary composition. This systematic review and network meta-analysis was performed with the objective of comparing different dietary interventions in terms of positive impact. Metformin, the currently preferred treatment, was also compared.
METHODS
The latest systematic search was performed on the 20th of March, 2023. Eligible randomised controlled trials (RCTs) included patients with PCOS and compared the dietary approach with another intervention or a standard diet. Outcomes were expressed via anthropometric measurements and hormonal, glycemic, and lipid levels. The Bayesian method was used to perform a network meta-analysis and to calculate the surface under the cumulative ranking curve (SUCRA) values in order to rank the dietary interventions. The overall quality of the evidence was assessed using the Grading of Recommendations Assessment, Development, and Evaluation system.
RESULTS
19 RCTs were identified, comprising data from 727 patients who were variously treated with 10 types of dietary interventions and metformin. The Dietary Approaches to Stop Hypertension (DASH) diet was the most effective in reducing Homeostatic Model Assessment of Insulin Resistance (SUCRA 92.33%), fasting blood glucose (SUCRA 85.92%), fasting insulin level (SUCRA 79.73%) and triglyceride level (SUCRA 82.07%). For body mass index (BMI), the most effective intervention was the low-calorie diet (SUCRA 84.59%). For weight loss, the low-calorie diet with metformin (SUCRA 74.38%) was the most effective intervention. Metformin produced the greatest reductions in low-density lipoprotein cholesterol (SUCRA 78.08%) and total testosterone levels (SUCRA 71.28%). The low-carb diet was the most effective intervention for reducing cholesterol levels (SUCRA 69.68%), while the normal diet (SUCRA 65.69%) ranked first for increasing high-density lipoprotein cholesterol levels.
CONCLUSION
Dietary interventions vary in their effects on metabolic parameters in women with PCOS. Based on our results, the DASH diet is the most effective dietary intervention for treating PCOS. Registration PROSPERO ID CRD42021282984.
Topics: Female; Humans; Polycystic Ovary Syndrome; Network Meta-Analysis; Metformin; Diet; Cholesterol
PubMed: 38388374
DOI: 10.1186/s12978-024-01758-5 -
Medicina (Kaunas, Lithuania) Dec 2023: The present systematic review and meta-analysis undertake a comparison of studies that examine the accuracy of robot-assisted dental implant placement in relation to... (Meta-Analysis)
Meta-Analysis Review
Accuracy Comparison between Robot-Assisted Dental Implant Placement and Static/Dynamic Computer-Assisted Implant Surgery: A Systematic Review and Meta-Analysis of In Vitro Studies.
: The present systematic review and meta-analysis undertake a comparison of studies that examine the accuracy of robot-assisted dental implant placement in relation to static computer-assisted implant surgery (SCAIS), dynamic computer-assisted implant surgery (DCAIS), and freehand procedures. This study aims to provide a comprehensive understanding of the precision of robot-assisted dental implant placement and its comparative efficacy in relation to other placement techniques. : The guidelines recommended by Preferred Reporting Items for Systematic Reviews and Meta-Analyses (PRISMA) were used to organize and compose this review. Four electronic databases (PubMed, Web of Science, Scopus, and Cochrane) were systematically searched for pertinent articles. Articles were selected following the inclusion and exclusion criteria. Qualitative and quantitative analyses of the selected articles were performed. : The initial electronic search resulted in 1087 hits. Based on the inclusion and exclusion criteria, five articles were selected for qualitative analysis, out of which three were considered for quantitative analysis. Three parameters were considered for accuracy evaluation (angular, coronal, and apical deviation). The mean angular deviation was -1.22 degrees (95% CI, -1.06--1.39), the mean coronal deviation was -0.15 mm (95% CI, -0.24--0.07), and the mean apical deviation was -0.19 mm (95% CI, -0.27--0.10). : The robotic implant system was found to have significantly lower angular deviations and insignificantly lower coronal and apical deviations compared to DCAIS. Within the limitations of this review, it can be concluded that robot-assisted implant placement in resin models permits higher accuracy compared to DCAIS and SCAIS systems. However, due to the limited number of comparative studies with high heterogeneity, the findings of this review should be interpreted with caution. Further research is necessary to confirm the clinical application of robotics in implant surgery.
Topics: Humans; Dental Implants; Robotics; Surgery, Computer-Assisted; Research Design; Computers; Imaging, Three-Dimensional
PubMed: 38276045
DOI: 10.3390/medicina60010011 -
Alzheimer's & Dementia : the Journal of... May 2023Machine learning research into automated dementia diagnosis is becoming increasingly popular but so far has had limited clinical impact. A key challenge is building... (Review)
Review
INTRODUCTION
Machine learning research into automated dementia diagnosis is becoming increasingly popular but so far has had limited clinical impact. A key challenge is building robust and generalizable models that generate decisions that can be reliably explained. Some models are designed to be inherently "interpretable," whereas post hoc "explainability" methods can be used for other models.
METHODS
Here we sought to summarize the state-of-the-art of interpretable machine learning for dementia.
RESULTS
We identified 92 studies using PubMed, Web of Science, and Scopus. Studies demonstrate promising classification performance but vary in their validation procedures and reporting standards and rely heavily on popular data sets.
DISCUSSION
Future work should incorporate clinicians to validate explanation methods and make conclusive inferences about dementia-related disease pathology. Critically analyzing model explanations also requires an understanding of the interpretability methods itself. Patient-specific explanations are also required to demonstrate the benefit of interpretable machine learning in clinical practice.
Topics: Humans; Machine Learning; Research Design; Dementia
PubMed: 36735865
DOI: 10.1002/alz.12948 -
Asian Journal of Psychiatry Mar 2022Stress and burnout are serious problems that impair the well-being and academic performance of medical students. Published systematic reviews and meta-analyses on... (Meta-Analysis)
Meta-Analysis
OBJECTIVE
Stress and burnout are serious problems that impair the well-being and academic performance of medical students. Published systematic reviews and meta-analyses on interventions to reduce the stress experienced by medical students did not conclude which interventions are the most effective due to the heterogeneity of the studies. To enhance the hierarchy of evidence, our study selected only randomized controlled studies. The aims were to obtain more reliable outcomes and to precisely summarize the specific interventions which effectively reduce the stress levels and burnout of medical students.
METHODS
We performed a systematic review and meta-analysis according to PRISMA guidelines. Medical databases (Embase, Ovid, and CINAHL) were searched for relevant randomized controlled studies published up to December 2019. Two treatment timepoints (postintervention, and the 6-month follow-up) were chosen. Stress measure outcomes were the main outcomes. A random effects model was used. An intention-to-treat analysis was conducted.
RESULTS
Six high-quality studies were found. They compared the efficacies of mindfulness-based interventions and clerkship as usual (N = 689). The stress measurement scores of each mindfulness-based intervention at postintervention were significantly better than those of the control groups, with medium effect size and low heterogeneity (95% CI 0.07-0.51; p = 0.01; I-squared index = 45%). At the 6-month follow-up, the mindfulness groups had significantly better results than the control groups, with medium effect size and negligible heterogeneity (95% CI 0.06-0.55; p = 0.02; I-squared index = 0%).
DISCUSSION
The results indicate that mindfulness-based interventions are effective in reducing subjective stress in medical students at both the short- and long-term intervention timepoints.
Topics: Burnout, Professional; Burnout, Psychological; Humans; Mindfulness; Research Design; Students, Medical
PubMed: 34995839
DOI: 10.1016/j.ajp.2021.102997 -
Journal of Clinical Epidemiology Jan 2023To evaluate and map the reporting and methodological quality of network meta-analysis (NMA) on acupuncture.
BACKGROUND AND OBJECTIVES
To evaluate and map the reporting and methodological quality of network meta-analysis (NMA) on acupuncture.
METHODS
Published acupuncture NMAs were searched through eight databases from inception to February 2022. The reporting and methodological quality of included studies was assessed using the Preferred Reporting Items for Systematic Reviews and Meta-Analyses for Network Meta-Analysis (PRISMA-NMA) statement and the Assessment of Multiple Systematic Reviews 2 (AMSTAR-2) checklist.
RESULTS
A total of 113 NMAs were identified. Most (99, 87.61%) studies were performed in China. Most studies focused on multiple acupuncture techniques (82.30%), and the main studied ailments were pain and poststroke sequelae (20.24%). The median (interquartile range (IQR)) score of the reporting quality was 26.5 (25-28.5). However, poor reporting rates in the protocol and registration (33.63%) and geometry of the network (35.40%), especially for China-based studies, were identified. The methodological quality of only 2 (1.77%) English studies was high. The reporting rate of Chinese studies was below 15% on each of items 4, 7, 10, and 12.
CONCLUSION
The reporting quality of the NMAs was moderate, but the methodological quality was very low. The reporting and methodological quality of future NMAs, especially for Chinese studies, need further improvement.
Topics: Humans; Acupuncture Therapy; Checklist; Network Meta-Analysis; Publications; Research Design
PubMed: 36351510
DOI: 10.1016/j.jclinepi.2022.11.004 -
Phlebology Oct 2021To assess the clinical efficacy of sulodexide, including a comparison with venoactive drugs (VAD) (micronized purified flavonoid fraction, MPFF; hydroxy-ethyl-rutosides,... (Meta-Analysis)
Meta-Analysis
OBJECTIVE
To assess the clinical efficacy of sulodexide, including a comparison with venoactive drugs (VAD) (micronized purified flavonoid fraction, MPFF; hydroxy-ethyl-rutosides, HR; calcium dobesilate;Ruscus extract combined with hesperidin methyl chalcone and vitamin C, Ruscus+HMC+VitC; horse chestnut seed extract, HCSE) and pentoxifylline in patients with chronic venous disease.
METHODS
We performed a literature search in MEDLINE, Embase, and Cochrane Library for randomized controlled trials (RCTs) and observational studies. Proportion of patients with complete venous ulcer healing was the primary outcome and lower leg volume, foot volume, ankle circumference and symptoms were the secondary outcomes. Bayesian network meta-analysis (NMA) was perfomed with random effects models using only RCTs. A meta-analysis of observational studies was performed for sulodexide because no RCT could be included in NMA for symptoms or signs.
RESULTS
Forty-five RCTs and eighteen observational studies were identified. Sulodexide was included only in a single NMA for the proportion of patients with complete ulcer healing and it showed to have the highest probability of being the best treatment (48%) compared with pentoxifylline (37%) and MPFF (16%). MPFF was the most effective treatment in reducing lower leg volume, CIVIQ-20 score and pain VAS scale while calcium dobesilate and Ruscus+HMC+VitC were the most effective in reducing foot volume and ankle circumference respectively.Meta-analyses of observational studies for sulodexide showed that it improves significantly the scoring of pain, feeling of swelling, heaviness and parasthesiae measured by Likert scales.
CONCLUSIONS
Sulodexide is at least as effective as pentoxifylline and more effective than MPFF in improving the rate of ulcer healing in patients with CVD. VADs are effective in improving venous symptoms and signs, as was also shown by sulodexide in the meta-analysis of observational studies. The relative effectiveness of sulodexide and VADs needs to be evaluated by an RCT in order to better inform clinical practice.
Topics: Glycosaminoglycans; Humans; Network Meta-Analysis; Pharmaceutical Preparations; Varicose Ulcer; Vascular Diseases
PubMed: 33983078
DOI: 10.1177/02683555211015020 -
BJS Open Sep 2021Multiple treatments for early-moderate grade symptomatic haemorrhoids currently exist, each associated with their respective efficacy, complications, and risks. The aim... (Meta-Analysis)
Meta-Analysis
BACKGROUND
Multiple treatments for early-moderate grade symptomatic haemorrhoids currently exist, each associated with their respective efficacy, complications, and risks. The aim of this study was to compare the relative clinical outcomes and effectiveness of interventional treatments for grade II-III haemorrhoids.
METHODS
A systematic review was conducted according to PRISMA criteria for all the RCTs published between 1980 and 2020; manuscripts were identified using the MEDLINE, Embase, and CENTRAL databases. Inclusion criteria were RCTs comparing procedural interventions for grade II-III haemorrhoids. Primary outcomes of interest were: symptom recurrence at a minimum follow-up of 6 weeks, postprocedural pain measured on a visual analogue scale (VAS) on day 1, and postprocedural complications (bleeding, urinary retention, and bowel incontinence). After bias assessment and heterogeneity analysis, a Bayesian network meta-analysis was performed.
RESULTS
Seventy-nine RCTs were identified, including 9232 patients. Fourteen different treatments were analysed in the network meta-analysis. Overall, there were 59 RCTs (73 per cent) judged as being at high risk of bias, and the greatest risk was in the domain measurement of outcome. Variable amounts of heterogeneity were detected in direct treatment comparisons, in particular for symptom recurrence and postprocedural pain. Recurrence of haemorrhoidal symptoms was reported by 54 studies, involving 7026 patients and 14 treatments. Closed haemorrhoidectomy had the lowest recurrence risk, followed by open haemorrhoidectomy, suture ligation with mucopexy, stapled haemorrhoidopexy, and Doppler-guided haemorrhoid artery ligation (DG-HAL) with mucopexy. Pain was reported in 34 studies involving 3812 patients and 11 treatments. Direct current electrotherapy, DG-HAL with mucopexy, and infrared coagulation yielded the lowest pain scores. Postprocedural bleeding was recorded in 46 studies involving 5696 patients and 14 treatments. Open haemorrhoidectomy had the greatest risk of postprocedural bleeding, followed by stapled haemorrhoidopexy and closed haemorrhoidectomy. Urinary retention was reported in 30 studies comparing 10 treatments involving 3116 participants. Open haemorrhoidectomy and stapled haemorrhoidopexy had significantly higher odds of urinary retention than rubber band ligation and DG-HAL with mucopexy. Nine studies reported bowel incontinence comparing five treatments involving 1269 participants. Open haemorrhoidectomy and stapled haemorrhoidopexy had the highest probability of bowel incontinence.
CONCLUSION
Open and closed haemorrhoidectomy, and stapled haemorrhoidopexy were associated with worse pain, and more postprocedural bleeding, urinary retention, and bowel incontinence, but had the lowest rates of symptom recurrence. The risks and benefits of each treatment should be discussed with patients before a decision is made.
Topics: Bayes Theorem; Hemorrhoidectomy; Hemorrhoids; Humans; Ligation; Network Meta-Analysis
PubMed: 34633439
DOI: 10.1093/bjsopen/zrab091 -
Obesity Reviews : An Official Journal... Feb 2024There is evidence that placebo and nocebo effects are significant for many conditions, but their impact on weight loss has not yet been well described. (Meta-Analysis)
Meta-Analysis Review
INTRODUCTION
There is evidence that placebo and nocebo effects are significant for many conditions, but their impact on weight loss has not yet been well described.
MATERIAL AND METHODS
A systematic review of studies indexed on PubMed, Cochrane, PsycINFO, PsycARTICLES, TripDatabase, and Embase was carried out. Studies (1) with at least two study groups - placebo and a corresponding control group; (2) published in English; and (3) focusing on adults participating in weight loss programs or on placebo/nocebo effects in weight loss were included. Synthesis and meta-analysis of the results of studies with comparable research plans were performed.
RESULTS
Some preliminary trends suggesting placebo and nocebo effects in weight loss were found. Placebo effects manifested in trends towards a slightly greater reduction of Body Mass Index (BMI) and body fat ratio in the placebo compared with the control groups. On the other hand, in one study, it was found that the expectancy effects of taking oral weight-loss agents might be disadvantageous (i.e., because they elicit a nocebo effect on weight loss).
CONCLUSION
The findings suggest a possibility that the nocebo effect may occur when an intervention has a medical context. In contrast, the placebo effect can be observed in cases where the intervention is of a different nature. However, considering the low number of studies analyzing the use of placebos in weight loss, new primary research is needed.
Topics: Adult; Humans; Nocebo Effect; Dietary Supplements; Research Design; Diet; Exercise
PubMed: 37950372
DOI: 10.1111/obr.13660 -
Oral Diseases Oct 2022To systematically review the prevalence of bacteraemia, triggered by dental intervention and home oral hygiene practices, in children. The network meta-analysis (NMA)... (Meta-Analysis)
Meta-Analysis Review
OBJECTIVES
To systematically review the prevalence of bacteraemia, triggered by dental intervention and home oral hygiene practices, in children. The network meta-analysis (NMA) quantitatively compared the risk of bacteraemia triggered by dental extractions and home and professional cleaning procedures.
MATERIALS AND METHODS
Clinical trials with the outcome "bacteraemia in children" were searched. The NMA was performed using the frequentist weighted least-squares approach comparing the odds ratios (OR) of different interventions.
RESULTS
Among 11 of 13 studies, dental treatment was performed under general anaesthesia. In 2,381 patients, bacteraemia occurred in 38.7%-56% patients following single-tooth extractions, in 22%-46% after manual toothbrushing (MTB), and in 26%-78% after power toothbrushing (PTB). When MTB was set as the reference (OR 1), rubber cup polishing showed a slightly higher risk (OR 1.26) of bacteraemia. PTB presented a higher risk (OR 1.79-2.27) than with single-tooth extractions (OR 1.55) but lower than that with multiple extractions (OR 2.55).
CONCLUSION
Daily use of MTB and routine professional cleaning were associated with the lowest risk of developing bacteraemia in children with gingivitis, almost as much as with a single-tooth extractions. Improved plaque control with PTB increased the risk of bacteraemia. There is limited evidence on gingivitis-free and systemically-diseased children.
Topics: Bacteremia; Child; Dental Plaque; Gingivitis; Humans; Network Meta-Analysis; Toothbrushing
PubMed: 34245644
DOI: 10.1111/odi.13957