Publications by authors named "Spyros Kolovos"

Aims: Heart failure is a chronic progressive condition, with considerable burden on patients' quality of life and economic burden for the healthcare systems. Before the approval of empagliflozin, there were no proven effective treatments for patients with heart failure with left ventricular ejection fraction (HF LVEF) > 40%. The aim of this study was to evaluate the cost-effectiveness of empagliflozin + standard of care (SoC) compared with SoC alone for patients with HF LVEF > 40%, from the perspective of the healthcare systems of the United Kingdom (UK), Spain, and France, and to quantify the healthcare costs for these patients.

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Aims: Heart failure (HF) is a complex syndrome commonly categorized into two main phenotypes [left ventricular ejection fraction (LVEF) below or above 40%], and although empagliflozin is the first approved medication with proven clinical effectiveness for both phenotypes, its cost-effectiveness of treating the entire HF population remains unknown.

Methods: The analysis was performed utilizing two preexisting, LVEF phenotype-specific cost-effectiveness models to estimate the cost-effectiveness of empagliflozin in adults for the treatment of symptomatic chronic HF, irrespective of ejection fraction (EF). The results of the phenotype-specific models were combined using a population-weighted approach to estimate the deterministic and probabilistic incremental cost-effectiveness ratios (ICERs).

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Background: X-linked hypophosphataemia (XLH) is a rare genetic condition passed on through the X chromosome which causes multiple symptoms including weakened teeth, bones, and muscles. Due to the rarity of the condition, little is known about the health outcomes as reported by people with the disease. The objectives of this study were threefold: to characterise key patient reported outcome measures (PROMs) in adults with XLH, to identify clusters of symptom-severity groups based on PROMs, and to analyse the longitudinal progression of available PROMs.

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Background: Follow-up visits 5 or 7 years after surgery were recommended for people having primary hip or knee replacement. The benefits of this practice to patients and the healthcare system, however, have not yet been specifically examined. The aim of this study was to investigate the association between long-term follow-up outpatient hospital visits and revision rates for patients who undergo primary knee or hip replacement surgery.

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Background: The objective of this study was to estimate the relative efficacy and safety of targeted therapies for the treatment of metastatic melanoma using a network meta-analysis (NMA).

Methods: A systematic literature review (SLR) identified studies in Medline, Embase and Cochrane published until November 2020. Screening used prespecified eligibility criteria.

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Background: Approximately 20% of patients experience chronic pain after total knee replacement (TKR). The impact of chronic pain after TKR on primary care services in the UK is currently unknown. The aim of this study was to compare primary care consultations and pain medicine prescriptions between patients with and without chronic pain after TKR.

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Objective: As part of the STAR Programme, a comprehensive study exploring long-term pain after surgery, we investigated how pain and function, health-related quality of life (HRQL), and healthcare resource use evolved over 5 years after total knee replacement (TKR) for those with and without chronic pain 1 year after their primary surgery.

Methods: We used data from the Clinical Outcomes in Arthroplasty Study prospective cohort study, which followed patients undergoing TKR from two English hospitals for 5 years. Chronic pain was defined using the Oxford Knee Score Pain Subscale (OKS-PS) where participants reporting a score of 14 or lower were classified as having chronic pain 1-year postsurgery.

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Background: Although routine NHS data potentially include all patients, confounding limits their use for causal inference. Methods to minimise confounding in observational studies of implantable devices are required to enable the evaluation of patients with severe systemic morbidity who are excluded from many randomised controlled trials.

Objectives: Stage 1 - replicate the Total or Partial Knee Arthroplasty Trial (TOPKAT), a surgical randomised controlled trial comparing unicompartmental knee replacement with total knee replacement using propensity score and instrumental variable methods.

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Background: Major depressive disorder is a chronic condition; its prevalence is expected to grow with the aging trend of high-income countries. Internet-based cognitive-behavioral therapy has proven efficacy in treating major depressive disorder.

Objective: The objective of this study was to assess the cost-effectiveness of implementing a community internet-based cognitive behavioral therapy intervention (Super@, the Spanish program for the MasterMind project) for treating major depressive disorder.

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Article Synopsis
  • The study aimed to estimate global COVID-19 infections and deaths among healthcare workers during the early pandemic phase, utilizing systematic reviews and comprehensive searches of literature until May 2020.
  • A total of 152,888 infections and 1,413 deaths among healthcare workers were reported, with notable differences in gender and job roles: most infections were in women and nurses, while most deaths were among men and doctors.
  • The findings highlighted that while Europe had the highest absolute numbers, the Eastern Mediterranean region had the highest death rate per infection, indicating a need for further investigation into the reasons for these variations, especially in high-risk specialties and lower reported rates in regions like Africa and India.
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Article Synopsis
  • * A study analyzed 34,128 COVID-19 patients across the US, South Korea, and Spain, revealing differences in gender and age demographics among countries.
  • * Compared to influenza patients hospitalized from 2014-2019, COVID-19 patients tend to be younger, more often male, and have fewer comorbidities and lower medication use, indicating a need for tailored response strategies.
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Article Synopsis
  • The study investigated the safety of hydroxychloroquine, a drug used for rheumatoid arthritis, particularly considering its controversial use for COVID-19 pneumonia.
  • It compared adverse events in patients starting hydroxychloroquine versus those starting sulfasalazine, analyzing data from multiple countries and focusing on severe events within a 30-day period.
  • Results showed no significant increase in severe adverse events for short-term use of hydroxychloroquine compared to sulfasalazine, but long-term use may be linked to a higher risk of cardiovascular issues.
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Background In this study we phenotyped individuals hospitalised with coronavirus disease 2019 (COVID-19) in depth, summarising entire medical histories, including medications, as captured in routinely collected data drawn from databases across three continents. We then compared individuals hospitalised with COVID-19 to those previously hospitalised with influenza. Methods We report demographics, previously recorded conditions and medication use of patients hospitalised with COVID-19 in the US (Columbia University Irving Medical Center [CUIMC], Premier Healthcare Database [PHD], UCHealth System Health Data Compass Database [UC HDC], and the Department of Veterans Affairs [VA OMOP]), in South Korea (Health Insurance Review & Assessment [HIRA]), and Spain (The Information System for Research in Primary Care [SIDIAP] and HM Hospitales [HM]).

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Objectives: Increasing physical activity reduces the risk of chronic illness including Type 2 diabetes, cardiovascular disease and certain types of cancer. Lifestyle interventions can increase physical activity but few successfully engage men. This study aims to investigate the 5 year cost-effectiveness of EuroFIT, a program to improve physical activity tailored specifically for male football (soccer) fans compared to a no intervention comparison group.

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Purpose: Approximately 70% of adults in Mexico are overweight or obese. Unhealthy lifestyle behaviors are also prevalent. We examined the association of three lifestyle behaviors with body mass index (BMI) categories in adults from Mexico.

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Background: There is uncertainty around whether to use unicompartmental knee replacement (UKR) or total knee replacement (TKR) for individuals with osteoarthritis confined to a single compartment of the knee. We aimed to emulate the design of the Total or Partial Knee Arthroplasty Trial (TOPKAT) using routinely collected data to assess whether the efficacy results reported in the trial translate into effectiveness in routine practice, and to assess comparative safety.

Methods: We did a population-based network study using data from four US and one UK health-care database, part of the Observational Health Data Sciences and Informatics network.

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Background: Multiple myeloma (MM) is associated with high healthcare resource utilisation and increasing hospitalisation rates. The aim of this study was to characterise the hospital use by patients with MM in the English National Health Service (NHS).

Methods: Routinely-collected aggregate data about all NHS-funded hospital admissions of patients with MM were analysed.

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Article Synopsis
  • The text refers to a correction made to a previously published article with the Digital Object Identifier (DOI) 10.1371/journal.pmed.1002736.
  • The correction likely addresses inaccuracies or errors in the original publication.
  • Readers seeking to understand the updated findings should refer to the corrected version of the article.
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Background: Reducing sitting time as well as increasing physical activity in inactive people is beneficial for their health. This paper investigates the effectiveness of the European Fans in Training (EuroFIT) programme to improve physical activity and sedentary time in male football fans, delivered through the professional football setting.

Methods And Findings: A total of 1,113 men aged 30-65 with self-reported body mass index (BMI) ≥27 kg/m2 took part in a randomised controlled trial in 15 professional football clubs in England, the Netherlands, Norway, and Portugal.

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Article Synopsis
  • The study focuses on predicting individual outcomes and costs for patients undergoing internet-based therapy for psychological disorders, emphasizing the need for personalized treatment recommendations.
  • Utilizing baseline data from 350 patients in a randomized controlled trial, researchers employed various machine learning techniques to assess predictive accuracy and identify significant factors influencing treatment success.
  • While predicting clinical outcomes and costs posed challenges, the findings revealed that specific questionnaires contributed to improved predictions, allowing better allocation of patients to suitable interventions.
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Purpose: Obesity and depression are among the leading causes of disability in Mexico, but their association has not been explored yet. The aim of the current study was to investigate the association between obesity and depression in Mexican population.

Methods: We used data from the health and nutrition survey (ENSANUT 2012), which is representative of the Mexican population.

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Background: An increasing number of model-based studies that evaluate the cost effectiveness of treatments for depression are being published. These studies have different characteristics and use different simulation methods.

Objective: We aimed to systematically review model-based studies evaluating the cost effectiveness of treatments for depression and examine which modelling technique is most appropriate for simulating the natural course of depression.

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