Publications by authors named "Ossama Y Mansour"

Introduction: Despite global progress in stroke care, challenges persist, especially in Low- and Middle-Income countries (LMIC). The Middle East and North Africa Stroke and Interventional Neurotherapies Organization (MENA-SINO) Stroke Program Accreditation Initiative aims to improve stroke care regionally.

Material & Method: A 2022 survey assessed stroke unit readiness in the Middle East and North Africa (MENA) + region, revealing significant regional disparities in stroke care between high-income and low-income countries.

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  • This study aimed to assess how cerebral microbleeds (CMBs) affect outcomes for stroke patients undergoing endovascular thrombectomy (EVT), focusing on functional independence and safety.
  • Using a systematic review approach, researchers analyzed four studies with 1,514 patients and found that the presence of CMBs significantly reduced the chances of achieving positive functional outcomes after EVT.
  • However, CMBs had no effect on successful revascularization rates, mortality, or the occurrence of various hemorrhagic complications, indicating a specific impact of CMBs on functional recovery rather than overall safety.
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  • Endovascular thrombectomy (EVT) is the primary treatment for acute ischemic stroke due to large vessel occlusion, but only about one-third of patients achieve good outcomes, partly due to the "no-reflow" phenomenon affecting blood circulation.
  • A meta-analysis was conducted to evaluate the effectiveness of combining EVT with intra-arterial (IA) tissue plasminogen activator (tPA) in improving patient outcomes.
  • The analysis revealed no significant differences in successful recanalization, functional independence, or risk of symptomatic intracranial hemorrhage between the EVT alone and the EVT plus IA tPA groups, indicating the need for further randomized controlled trials.
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Background: Acute stroke care is complex and requires multidisciplinary networking. There are insufficient data on stroke care in the Middle East and adjacent regions in Asia and Africa.

Objective: Evaluate the state of readiness of stroke programs in the Middle East North Africa and surrounding regions (MENA+) to treat acute stroke.

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Background And Objectives: COVID-19-related inflammation, endothelial dysfunction, and coagulopathy may increase the bleeding risk and lower the efficacy of revascularization treatments in patients with acute ischemic stroke (AIS). We aimed to evaluate the safety and outcomes of revascularization treatments in patients with AIS and COVID-19.

Methods: This was a retrospective multicenter cohort study of consecutive patients with AIS receiving intravenous thrombolysis (IVT) and/or endovascular treatment (EVT) between March 2020 and June 2021 tested for severe acute respiratory syndrome coronavirus 2 infection.

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Background And Objectives: Declines in stroke admission, IV thrombolysis (IVT), and mechanical thrombectomy volumes were reported during the first wave of the COVID-19 pandemic. There is a paucity of data on the longer-term effect of the pandemic on stroke volumes over the course of a year and through the second wave of the pandemic. We sought to measure the effect of the COVID-19 pandemic on the volumes of stroke admissions, intracranial hemorrhage (ICH), IVT, and mechanical thrombectomy over a 1-year period at the onset of the pandemic (March 1, 2020, to February 28, 2021) compared with the immediately preceding year (March 1, 2019, to February 29, 2020).

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Article Synopsis
  • Previous studies indicate that COVID-19-related strokes have different mechanisms and outcomes compared to non-COVID-19 strokes, prompting a need for more comparative research.
  • This study analyzed 697 patients with acute large vessel occlusion (LVO), comparing 302 COVID-19 patients to 395 non-COVID-19 patients, and found significant age and gender differences, with COVID-19 patients generally being younger and more male.
  • Results showed that COVID-19 was linked to lower chances of complete revascularization and worse functional outcomes, as well as higher rates of in-hospital complications and mortality.
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  • Recent studies showed a rise in cerebral venous thrombosis (CVT) cases during the COVID-19 pandemic, prompting this evaluation of hospitalization and mortality rates comparing the pandemic year (2020) to the year prior (2019).
  • A cross-sectional study analyzed data from 171 stroke centers worldwide, focusing on CVT admissions and associated mortality from January 2019 to May 2021, revealing no significant differences in overall CVT volume or mortality between 2019 and 2020.
  • However, the first five months of 2021 saw a notable increase in CVT admissions compared to 2019 and 2020, with higher mortality rates linked to COVID-19-positive patients and instances of vaccine-induced immune
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Background: Distal vessel occlusions represent about 25-40% of acute ischemic stroke (AIS), either as primary occlusion or secondary occlusion complicating mechanical thrombectomy (MT) for large vessel occlusion.

Objective: Our aim was to evaluate safety and effectiveness of MT associated with the best medical treatment (BMT) in the management of AIS patients with distal vessel occlusion in comparison with the BMT alone.

Methods: Retrospective analysis was conducted on AIS patients treated by MT+BMT for primary distal vessel occlusion between 2015 and 2020, and were compared with a historic cohort managed by BMT alone between 2006 and 2015 selected based on the same inclusion criteria.

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Background: The mechanisms and outcomes in coronavirus disease (COVID-19)-associated stroke are unique from those of non-COVID-19 stroke.

Objective: To describe the efficacy and outcomes of acute revascularization of large vessel occlusion (LVO) in the setting of COVID-19 in an international cohort.

Methods: We conducted an international multicenter retrospective study of consecutively admitted patients with COVID-19 with concomitant acute LVO across 50 comprehensive stroke centers.

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Background: COVID-19 pandemic has negatively impacted stroke care services at multiple levels. There was a decline in acute stroke admissions. Fewer interventions have been performed.

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There is little information on the acute cerebrovascular complications of coronavirus disease 2019 (COVID-19) in Egypt. The aim of this study was to estimate the proportion of acute cerebrovascular disease (CVD) among COVID-19 patients and evaluate their clinical and radiological characteristics in comparison with non-COVID-19 CVD. In a retrospective study, COVID-19 patients whom presented with CVD in Assiut and Aswan University Hospitals were compared with non-COVID-19, CVD patients, admitted to Qena University Hospital, prior to the pandemic.

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Background: During the COVID-19 pandemic, decreased volumes of stroke admissions and mechanical thrombectomy were reported. The study's objective was to examine whether subarachnoid haemorrhage (SAH) hospitalisations and ruptured aneurysm coiling interventions demonstrated similar declines.

Methods: We conducted a cross-sectional, retrospective, observational study across 6 continents, 37 countries and 140 comprehensive stroke centres.

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Objective: To measure the global impact of COVID-19 pandemic on volumes of IV thrombolysis (IVT), IVT transfers, and stroke hospitalizations over 4 months at the height of the pandemic (March 1 to June 30, 2020) compared with 2 control 4-month periods.

Methods: We conducted a cross-sectional, observational, retrospective study across 6 continents, 70 countries, and 457 stroke centers. Diagnoses were identified by their ICD-10 codes or classifications in stroke databases.

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Background: COVID-19 infection has been known to predispose patients to both arterial and venous thromboembolic events such as deep venous thrombosis, pulmonary embolism, myocardial infarction, and stroke. A few reports from the literature suggest that Cerebral Venous Sinus Thrombosis (CVSTs) may be a direct complication of COVID-19.

Objective: To review the clinical and radiological presentation of COVID-19 positive patients diagnosed with CVST.

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In developing countries like Egypt, the clinical workflow of stroke management is poorly established due to the lack of awareness of the stroke patients concerning their need of therapeutic intervention and the poor identification of facilities equipped to treat stroke. Hence, establishing a stroke system of care in developing countries that can efficiently and rapidly triage patients to the appropriate reperfusion therapy center is imperative to improving stroke management and outcomes. To evaluate a pilot experience in stroke hospital identification and expediting decision-making in AIS treatment through the Alexandria stroke network and Egyptian Stroke Network (ESN)-app.

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Background And Purpose: Coronavirus disease 2019 (COVID-19) is associated with a small but clinically significant risk of stroke, the cause of which is frequently cryptogenic. In a large multinational cohort of consecutive COVID-19 patients with stroke, we evaluated clinical predictors of cryptogenic stroke, short-term functional outcomes and in-hospital mortality among patients according to stroke etiology.

Methods: We explored clinical characteristics and short-term outcomes of consecutively evaluated patients 18 years of age or older with acute ischemic stroke (AIS) and laboratory-confirmed COVID-19 from 31 hospitals in 4 countries (3/1/20-6/16/20).

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Background: The COVID-19 pandemic led to profound changes in the organization of health care systems worldwide.

Aims: We sought to measure the global impact of the COVID-19 pandemic on the volumes for mechanical thrombectomy, stroke, and intracranial hemorrhage hospitalizations over a three-month period at the height of the pandemic (1 March-31 May 2020) compared with two control three-month periods (immediately preceding and one year prior).

Methods: Retrospective, observational, international study, across 6 continents, 40 countries, and 187 comprehensive stroke centers.

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Background: While mechanical thrombectomy (MT) is the standard of care for large vessel occlusion strokes, the optimal management of tandem occlusions (TO) remains uncertain. We aimed to determine the current practice patterns among stroke physicians involved in the treatment of TO during MT.

Methods: We distributed an online survey to neurovascular practitioners (stroke neurologists, neurointerventionalists, neurosurgeons, and radiologists), members of professional societies.

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Background And Purpose: The effect of coronavirus disease 2019 (COVID-19) pandemic on performance of neuroendovascular procedures has not been quantified.

Methods: We performed an audit of performance of neuroendovascular procedures at 18 institutions (seven countries) for two periods; January-April 2019 and 2020, to identify changes in various core procedures. We divided the region where the hospital was located based on the median value of total number of COVID-19 cases per 100,00 population-into high and low prevalent regions.

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COVID-19 pandemic has led to a change in the way we manage acute medical illnesses. This pandemic had a negative impact on stroke care worldwide. The World Stroke Organization (WSO) has raised concerns due to the lack of available care and compromised acute stroke services globally.

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Background: The novel coronavirus (COVID-19) global pandemic is associated with an increased incidence of acute ischemic stroke (AIS) secondary to large vessel occlusion (LVO). The treatment of these patients poses unique and significant challenges to health care providers requiring changes in existing protocols.

Case Presentation: A 54-year-old COVID-19 positive patient developed sudden onset left hemiparesis secondary to an acute right middle cerebral artery occlusion (National Institutes of Health Stroke Scale (NIHSS) score = 11).

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Background: Tandem basilar artery occlusions (tBAO) are defined as concomitant basilar artery and extracranial dominant vertebral artery occlusions. The prognosis of such tBAO treated by mechanical thrombectomy (MT) has been scantly reported. The purpose of our study was to compare the safety and effectiveness of MT for patients with tBAO compared to those with non-tandem basilar artery occlusions (ntBAO).

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Background: Severe acute respiratory syndrome-coronavirus-2 (SARS-CoV-2) has been associated with a significant risk of thrombotic events in critically ill patients.

Aim: To summarize the findings of a multinational observational cohort of patients with SARS-CoV-2 and cerebrovascular disease.

Methods: Retrospective observational cohort of consecutive adults evaluated in the emergency department and/or admitted with coronavirus disease 2019 (COVID-19) across 31 hospitals in four countries (1 February 2020-16 June 2020).

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