by Anne-Fleur Griffon, Loeïza Rault, Clément Tanvet, Etienne Simon-Lorière, Myrielle Dupont-Rouzeyrol, Catherine Inizan
BackgroundComparing the in vitro fitness of dengue virus (DENV) isolates is a pivotal approach to assess the contribution of DENV strains’ replicative fitness to epidemiological contexts, including serotype replacements. Competition assays are the gold standard to compare the in vitro replicative fitness of viral strains. Implementing competition assays between DENV serotypes requires an experimental setup and an appropriate read-out to quantify the viral progeny of strains belonging to different serotypes.
MethodsIn the current study, we optimized an existing serotyping qRT-PCR by adapting primer/probe design and multiplexing the serotype-specific qRT-PCR reactions, allowing to accurately detect and quantify all four DENV serotypes. We next developed an in vitro competition assay to compare the replicative fitness of two DENV serotypes in the human hepatic cell line HuH7.
FindingsThe qRT-PCR was specific, and had a limit of detection below 7.52, 1.19, 3.48 and 1.36 genome copies/µL, an efficiency of 1.993, 1.975, 1.902, 1.898 and a linearity (R²) of 0.99975, 0.99975, 0.99850, 0.99965 for DENV-1, −2, −3 and −4, respectively. Challenge of this multiplex serotype-specific qRT-PCR on mixes of viral supernatants containing known concentrations of strains from two serotypes evidenced an accurate quantification of the amount of genome copies of each serotype. Quantification of the viral progeny of each serotype in the inoculum and the supernatant of competition assays using the serotype-specific multiplex qRT-PCR unveiled an enrichment of the supernatant in DENV-1 genome copies, uncovering the enhanced replicative fitness of this DENV-1 isolate.
ConclusionsThis optimized qRT-PCR combined with a relevant cellular model allowed to accurately quantify the viral progeny of two DENV strains belonging to two different serotypes in a competition assay, allowing to determine which strain had a replicative advantage. This reliable experimental setup is adaptable to the comparative study of the replicative fitness of any DENV serotypes.
Patients who survive admission to intensive care unit (ICU) for critical illness are at high risk of developing muscle atrophy and weakness, commonly diagnosed as ICU-acquired weakness (ICUAW). The development of ICUAW is closely linked to long-term symptoms and impairments known as post-intensive care syndrome (PICS). Despite heightened recognition of impairments, there is limited research supporting effective interventions to improve muscle and physical outcomes after hospital discharge. Prior to developing and testing interventions for ICU survivors, it is imperative to understand the trajectory of muscle and physical function recovery following an ICU stay. The purpose of this study is to longitudinally investigate skeletal muscle health and physical function outcomes after ICU admission.
This protocol describes a single site, prospective, observational study in adult patients who have survived a critical illness (ie, sepsis or acute respiratory failure). Patients will participate in a battery of testing including primary outcomes: muscle power and physical function; and secondary outcomes: muscle strength, muscle size, endurance and physical activity (by accelerometry) at hospital discharge and 3, 6, and 12 months post-discharge. A subset of patients will participate in muscle biopsy and venipuncture. To examine if the trajectory of recovery predicts primary outcomes, we will perform multivariate linear regression models in 150 evaluable patients. To examine differences in molecular and cellular outcomes in plasma and muscle tissue, a control group of community-dwelling adults without history of an ICU stay will be enrolled as a comparator group. Enrolment started on 18 October 2022 with an estimated completion date of 1 August 2027.
This protocol was approved by the University of Kentucky Office of Research Integrity Medical Internal Review Board (# 77407), with patients providing informed written consent. We anticipate our findings to establish recovery trajectories, improving the classification of patients who experience sustained physical disability. Improved identification of recovery trajectories of muscle and physical function enables future studies to employ an individually targeted rehabilitation approach, that is, precision medicine, with the goal of improving patient outcomes. The cellular findings will support the development of novel interventions specifically designed for detecting underlying mechanisms. We intend to disseminate findings to patients, healthcare professionals, the public and other relevant groups via conference presentations and manuscripts without publication restrictions.
Type 1 diabetes (T1D) demands self-management skills, knowledge and confidence to prevent medical complications. Adolescents living with T1D have distinct developmental challenges resulting in a worsening in glycaemic stability, irregular care and an increased risk for complications all while transitioning to adult healthcare. Age-specific online platforms could facilitate transition by fostering self-management education and support. The Support online self-guided training platform has been shown to increase the confidence of adults with T1D in managing their glycaemia. We aim to test the effectiveness of Support-t (ie, adapted for youth), compared with usual care, in improving haemoglobin A1c (HbA1c) and to understand the context of its implementation.
We will conduct a multisite, assessor-blinded, randomised controlled, parallel group, two-arm, superiority trial, evaluating effectiveness and implementation of Support-t versus usual care in 200 adolescents (14–16 years old) living with T1D. The active arm will have an 18-month access to Support-t, and their healthcare team will be trained on the platform’s content. The control arm will receive usual care. The primary outcome is HbA1c at 18 months. Secondary outcomes include self-efficacy for diabetes self-management, transition readiness, diabetes-specific quality of life, diabetes distress, continuous glucose monitoring metrics, number of severe hypoglycaemic events, diabetic ketoacidosis, T1D-related emergency department visits and hospitalisations as well as engagement and satisfaction. A subgroup of participants in the active arm and of healthcare providers will be interviewed assessing barriers, facilitators, engagement and fidelity of the intervention. Primary analysis will be by intention-to-treat. The difference in mean HbA1c at 18 months (with a 95% CI) will be calculated between both arms. A cost-effectiveness analysis is also planned.
December 8, 2024 version of the protocol was approved by the McGill University Health Centre Research Ethics Board (MP-37-2024-9734). Results will be disseminated through peer-reviewed publications and patient-partners’ network.
ClinicalTrials.gov (NCT05910840).
Admission to a surgical intensive care unit (ICU) following major surgery is associated with a number of discomforts, not only related to the disease itself but also to the care provided or the ICU environment itself (lights, sounds, pain, sleep deprivation, thirst, etc). This discomfort is real and can be associated with psychological consequences. We hypothesised that the use of immersive virtual reality (IVR) with HypnoVR is feasible and can help reduce discomfort in intensive care.
The ZION trial is a prospective, monocentric trial randomising 194 patients admitted to a surgical ICU after a major surgery. The inclusion criterion is patients admitted to a surgical ICU for at least 48 hours following major surgery (cardiac, thoracic or major abdominal surgery). Patients will be allocated to the intervention group (n=97) or the control group (n=97). In the intervention group, patients will receive IVR using HypnoVR two times a day during the ICU stay (2–5 days). In the control group, postoperative care will be conducted according to standard care without IVR. The primary endpoint will be the 18-item IPREA (Inconforts des Patients de REAnimation) questionnaire on the day of ICU discharge. The secondary endpoints will include intensity of discomfort symptoms (anxiety, pain, dyspnoea, thirst and sleep deprivation); the 18-Item IPREA Questionnaire assessed daily from randomisation to the V1 follow-up visit (ICU discharge); incidence of delirium; cumulative morphine consumption at ICU discharge; length of ICU stay and anxiety or depression at 1 month after discharge from intensive care and patient experience of device use.
Ethical approval was obtained from the institutional review board of the University Hospital of Amiens (Registration number ID: 2024-A01528-39) in January 2025.
Distal radius fractures account for one-fifth of all fractures in the active elderly population and may cause chronic pain, loss of hand function and reduced work productivity, imposing a significant socioeconomic burden. Most are initially treated with closed reduction and casting, but 30% subsequently require surgery due to insufficient realignment. The current approaches for analgesia for closed reduction are suboptimal. A brachial plexus nerve block provides complete pain relief and muscle relaxation distal to the elbow, potentially creating better conditions for realignment of the fractured bone ends. This may ultimately translate into reduced need for surgery and result in better functional outcomes and fewer complications compared to a haematoma block, which is the current standard care in Denmark.
The BLOCK Trial is an investigator-initiated, parallel-group, allocation-concealed, outcome assessor and analyst-blinded, superiority, randomised, controlled, clinical multicentre trial performed at 11 Danish emergency departments. Eligible adult patients with a distal radius fracture who need closed reduction will be included and allocated 1:1 to either an ultrasound-guided brachial plexus nerve block or a haematoma block. The primary outcome is the proportion of patients with distal radius fracture surgery 90 days after closed reduction. We will include 1716 participants to detect or discard a relative risk reduction of surgery of 20%. Secondary outcomes include treatment-related complications, patient-reported wrist function, pain during closed reduction and proportion of patients with unacceptable radiographic fracture position immediately after closed reduction.
The trial is approved by the Danish Medicines Agency and the Danish Research Ethics Committees (EU CT number: 2024-512191-35-00). All results will be summarised on www.theblocktrial.com, clinicaltrials.gov and euclinicaltrials.eu after publication. Primary and secondary outcome results from 0 to 90 days will be presented in the main article and submitted to a peer-reviewed journal. Results from outcomes on the 12-month follow-up will be presented separately.