Publications by authors named "Andrew Cheung"

Simultaneous interpreting (SI) enables real-time cross-language communication without significant delays and is vital for fast-paced environments such as multilingual conferences. Automatic subtitles, powered by artificial intelligence (AI), is an important mode of audiovisual translation and has been widely deployed by virtual conferencing platforms to help users overcome language barriers. While the cognitive and emotional impacts of SI have been explored in prior studies, research directly comparing SI, auto-subtitling, and their combined use remains limited.

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Introduction: The predictive value of CT markers of intracerebral haemorrhage (ICH) expansion is time-dependent, but data in the ultra-early period (<2 h from onset) are limited. We aimed to describe the frequency of these CT markers, their association with haematoma volume, haematoma expansion (HE) and functional outcome at 90-days. We also investigated the effect of tranexamic acid on HE in the presence of these markers.

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Background And Objectives: The association of anesthesia approach during endovascular thrombectomy (EVT) with clinical outcomes in large strokes is unexplored. We aimed to evaluate whether general anesthesia (GA), compared with non-GA, was associated with better functional outcomes in the SELECT2 trial.

Methods: In a prespecified secondary analysis of the SELECT2 trial that enrolled patients with large strokes on noncontrast CT (Alberta Stroke Program Early CT Score [ASPECTS] 3-5), CT perfusion/MRI (core volume ≥50 mL), or both, functional outcomes were compared in EVT-treated patients who received GA or non-GA and whether this association was modified by stroke severity (NIH Stroke Scale score), ischemic injury estimates, and collateral status was evaluated.

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Background: Access to endovascular thrombectomy (EVT) for acute ischaemic stroke (AIS) and the outcome disparities in culturally and linguistically diverse (CALD) populations are understudied. South-Western Sydney (SWS), characterised by high prevalence of CALD populations, provides an ideal setting to explore these disparities. This study aimed to assess whether being born in a country where English is not the primary language ('language other than English'; LOTE) affects access to EVT and outcomes for acute ischaemic stroke while also identifying demographic risk factors influencing stroke severity and outcomes.

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This study investigates to what extent second language production (L2) and translational production are influenced by cognitive constraints due to their bilingual processing. Compared with monolingual production in first language (L1), the two bilingual productions are subject to the same cognitive constraints due to the co-activation of two linguistic systems and the language contact interference, though they involve two distinctive conceptualization stages, which may cause variations to their cognitive constraint. Entropy is utilized as an indicator of cognitive constraints in the study to illuminate how bilingual processing causes cognitive constraints to the two bilingual productions.

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Background: COVID-19 induces a prothrombotic state that increases the risk of venous thromboembolism (VTE) in hospitalized patients, but the incidence of postdischarge VTE is not well characterized in prospective studies.

Objective: To determine the incidence of symptomatic VTE after hospitalization with COVID-19 infection.

Methods: The Venous Thrombosis Virtual Surveillance in COVID (VVIRTUOSO) study was a prospective multicenter cohort study (2021 to 2022) conducted at 6 sites in Canada.

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Bow hunter's syndrome is a rare syndrome of dynamic compression of the vertebral artery leading to recurrent posterior circulation stroke and/or transient ischaemic attack. The artery is compressed by the transverse process of a cervical vertebra or other structures. We describe a man in his 20s who had recurrent posterior circulation strokes confirmed on CT perfusion imaging before a dynamic left vertebral artery stenosis was found on neck manoeuvres during digital subtraction angiography.

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Background: There are limited data on ultra-early hematoma growth dynamics and their clinical impact in primary intracerebral hemorrhage (ICH). We aimed to estimate the incidence of hematoma expansion within the hyperacute period of ICH, describe hematoma dynamics over time, investigate the associations between ultra-early hematoma expansion and clinical outcomes after ICH, and assess the effect of tranexamic acid on ultra-early hematoma expansion.

Methods: We performed a preplanned secondary analysis of the STOP-MSU trial (Stopping Intracerebral Hemorrhage With Tranexamic Acid for Hyperacute Onset Presentation Including Mobile Stroke Units), which compared tranexamic acid with placebo in 201 patients with primary ICH presenting within 2 hours of symptom onset.

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Background And Objectives: Although previous trials have established the efficacy and safety of endovascular thrombectomy (EVT) in large ischemic core strokes, most of them excluded patients with extracranial internal carotid artery (e-ICA) occlusion. We aimed to compare outcomes in patients with e-ICA occlusion and large ischemic core infarcts treated with EVT vs medical management (MM).

Methods: This was a secondary analysis of the SELECT2 trial, a randomized controlled trial conducted at 31 international sites.

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Background: Timely identification of the etiology of transaminitis is critical in informing subsequent management as strategies can vary from supportive care to urgent transplant assessment. This is especially important in returning travelers as there may be multiple causes of injury that need to be addressed.

Case Report: We present a case of severe transaminitis secondary to non-hepatitis viral co-infections.

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Article Synopsis
  • Endovascular thrombectomy (EVT) has proven safe and effective for patients suffering from large core strokes, but the effects of reperfusion quality and procedure details on outcomes are still unclear.
  • In the SELECT2 trial, findings indicated that 80% of patients experienced successful reperfusion, which correlates with better clinical outcomes, particularly in those who achieved near-complete reperfusion.
  • Longer procedure times negatively impacted patient outcomes, while the method of thrombectomy (aspiration vs stent-retriever) showed no significant differences in reperfusion success or functional recovery.
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Atrial fibrillation, the most prevalent cardiac arrhythmia, has witnessed significant advancements in treatment modalities, transitioning from invasive procedures like the maze procedure to minimally invasive catheter ablation techniques. This review focuses on recent improvements in anesthetic approaches that enhance outcomes in catheter atrial fibrillation ablation. We highlight the efficacy of contact force sensing catheters with steerable introducer sheaths, which outperform traditional catheters by ensuring more effective contact time and lesion formation.

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Article Synopsis
  • The study investigated whether intravenous tranexamic acid can reduce haematoma growth in patients experiencing an acute intracerebral hemorrhage when administered within 2 hours of onset, compared to a placebo.
  • Conducted as a double-blind, randomized phase 2 trial across multiple countries, the research included 201 eligible participants who were assigned to receive either tranexamic acid or saline as a placebo.
  • The primary outcome measured was haematoma growth assessed through CT scans at 24 hours, alongside safety endpoints including mortality and thromboembolic events at specified intervals.
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Pediatric large-vessel occlusion has a poor natural history. Recent retrospective studies have demonstrated the potential benefits, feasibility, and safety profile of mechanical thrombectomy in children. However, the role of thrombectomy in pediatric M2 occlusions remains uncertain.

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Article Synopsis
  • Patients with large ischemic core strokes often have poor outcomes and are rarely transferred for endovascular thrombectomy (EVT), leading to a need for better understanding of treatment effects in different patient groups.
  • The study analyzed data from the SELECT2 trial, focusing on adults with acute ischemic strokes due to specific artery occlusions, comparing those who were directly treated at EVT centers with those who were transferred.
  • Results indicated that EVT improved functional outcomes in both transfer and non-transfer patients, suggesting that EVT can benefit patients regardless of transfer delays, although the median ASPECTS score showed a decline during transfers.
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Importance: Whether endovascular thrombectomy (EVT) efficacy for patients with acute ischemic stroke and large cores varies depending on the extent of ischemic injury is uncertain.

Objective: To describe the relationship between imaging estimates of irreversibly injured brain (core) and at-risk regions (mismatch) and clinical outcomes and EVT treatment effect.

Design, Setting, And Participants: An exploratory analysis of the SELECT2 trial, which randomized 352 adults (18-85 years) with acute ischemic stroke due to occlusion of the internal carotid or middle cerebral artery (M1 segment) and large ischemic core to EVT vs medical management (MM), across 31 global centers between October 2019 and September 2022.

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Epiploic appendagitis is a rare cause of acute lower abdominal pain. Epiploic appendices are fat-filled serosal outpouchings of the cecum and sigmoid colon. Primary epiploic appendagitis (PEA) is characterized by epiploic inflammation caused by torsion of the appendage leading to ischemia or thrombosis of the appendage draining vein.

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Article Synopsis
  • - The study aimed to determine the cost-effectiveness of endovascular thrombectomy (EVT) for patients with M2 occlusions compared to those who did not receive EVT, using real-world data and clinical trial findings.
  • - Researchers matched 83 patients (42 EVT and 41 non-EVT) based on baseline characteristics and developed a Markov model to assess long-term outcomes, revealing greater quality-adjusted life years (QALY) but higher costs associated with EVT treatment.
  • - The results showed that EVT was more beneficial in terms of QALY (5.48 vs 5.24) but also more expensive (A$133,457 vs A$126,127), leading to an incremental cost-effect
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Endovascular thrombectomy (EVT) is the standard of care for large vessel occlusion stroke. Use of Computed Tomographic Perfusion (CTP) to select EVT candidates is variable. The frequency of treatment and outcome in patients with unfavourable CTP patterns is unknown.

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Background: Balloon-assisted deployment/remodelling is a proven adjunctive technique for coil embolization of intracranial aneurysms, and it may be a helpful adjunct in delivering the Woven EndoBridge (WEB) device.

Objective: To evaluate the safety, efficacy and feasibility of balloon-assisted WEB deployment in both ruptured and unruptured intracranial aneurysms in both typical and atypical locations.

Methods: Patients who underwent treatment of ruptured and unruptured intracranial aneurysms with the BAWD technique were retrospectively identified from a prospectively maintained database at two neurointerventional centres.

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Article Synopsis
  • Powassan virus (POWV) is a dangerous tick-borne virus that leads to severe brain infections in people, with no current vaccines or treatments available.
  • Researchers have explored two main vaccine development strategies: modifying the POWV genome to enhance its vulnerability to immune responses and using a live-attenuated yellow fever virus (YFV-17D) to deliver POWV proteins.
  • The promising results showed that the chimeric vaccine candidate protected mice significantly, achieving a 70% survival rate after direct exposure and even 100% survival with a two-step vaccination process, indicating potential for a viable POWV vaccine.
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Background: Where stroke occurs with pre-existing atrial fibrillation (AF)studies validating the safety and efficacy of bridging thrombolysis, and the use of endovascular thrombectomy (EVT) in the setting of prior anticoagulation, are limited to single-center reports.

Methods: In a retrospective analysis, AF patients undergoing EVT for anterior circulation large vessel occlusion stroke enrolled in a prospectively-maintained, international multicenter database (International Stroke Perfusion Imaging Registry (INSPIRE)) between 2016 and 2019 were studied. Patients were categorized by anticoagulation status: anticoagulated (warfarin/non-vitamin K oral anticoagulants) versus not anticoagulated.

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Background: Initially developed in the intensive care unit (ICU) at St. Joseph's Healthcare Hamilton (SJHH) the 3 Wishes Project (3WP) provides personalized, compassionate care to dying patients and their families. The objective of this study was to develop and evaluate 3WP expansion strategies for patients cared for on General Internal Medicine (GIM) wards in our hospital.

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