Brain Frailty and Functional Outcomes After Thrombolysis for Acute Ischemic Stroke

Another useless piece of describing a problem with NO solution provided! I'd fire everyone involved in this crapola!

Brain Frailty and Functional Outcomes After Thrombolysis  for Acute Ischemic Stroke

 SpencerP.Loewen,PhD;NishitaSingh,MD;IbrahimAlhabli,MD;FouziBala,MD;BrianBuck,MD;FaysalBenali,MD;WilliamBetzner,MSc;KadenLam,BHSc; LucianaCatanese,MD;AleksanderTkach,MD;DarDowlatshahi,MD,PhD;FedericoCarpani,MD;ThaliaS.Field,MD;GaryHunter,MD;HoumanKhosravani,MD,PhD; AleksandraPikula,MD;MichelShamy,MD,MA;TolulopeT.Sajobi,PhD;MohammedAlmekhlafi,MD,MSc;RickSwartz,MD;BijoyMenon,MD; MaheshKate,DM;AravindGanesh,MD,DPhil(Oxon)

 Abstract 

IMPORTANCE

The cumulative burden of chronic vascular and neurodegenerative changes contributes to brain frailty, which may reduce the brain’s capacity to recover from acute ischemic stroke (AIS). The association between brain frailty markers and post stroke outcomes after thrombolysis is unclear. OBJECTIVE

To evaluate associations between brain frailty assessed on non–contrast-enhanced computed tomography(NCCT) and magnetic resonance imaging(MRI) and functional outcome in patients with AIS treated with intravenous thrombolysis. 

DESIGN, SETTING, AND PARTICIPANTS

This cohort study was a posthoc analysis of the Alteplase compared to Tenecteplase(AcT) trial, an investigator-led, registry-linked, parallel-group, open label, randomized clinical trial that enrolled patients between December10, 2019,and January25, 2022, at 22 primary and comprehensive stroke centers across Canada. Participants included adults 18 years or older diagnosed with ischemic stroke causing disabling neurological deficit, presenting within 4.5 hours of symptom onset, and meeting Canadian guidelines for thrombolysis. Markersof brain frailty(cortical and subcortical atrophy, white matter changes[Fazekas score,grouped as 0,1-2, and3-6],lacunes, chronic infarctions, and[on MRI] microbleeds, siderosis, and enlarged perivascular spaces) were retrospectively assessed while reviewers were blinded to outcome variables. Analyses were performed from July 24, 2024, to March 25,2025. 

  EXPOSURES

Patients underwent baseline NCCT and were randomized to receive intravenous thrombolysis with alteplase(0.9mg/kg) or tenecteplase (0.25mg/kg). Some patients also received post treatment brain MRI. 

MAIN OUTCOMES AND MEASURES

The primary outcome was excellent functional outcome (modified Rankin Scale [mRS]scoreof0-1) at 90days. Secondary outcomes included 90-day ordinal mRS score(trichotomizedas0-2,3-4, and 5-6), symptomatic intracerebral hemorrhage, and mortality. Sensitivity analyses were performed in patients with available MRI scans. 

  RESULTS

Among the 1568 patients (median age,74[IQR,63-83]years;817male[52.1%])with interpretable NCCT findings, after correcting for multiple comparisons, higher total Fazekas score of 3 to 6 compared with 0 was associated with lower odds of a 90-day mRS score of 0 to 1(adjusted odds ratio[OR],0.40[95%CI,0.24-0.65]). Total Fazekas score(adjusted common OR[ACOR],2.80 [95%CI,1.88-4.16]),corticalatrophy(ACOR,2.65[95%CI.1.63-4.32]),andtotalbrainfrailtyscore (ACOR,3.15[95%CI,1.87-5.33])were each associated with worse ordinal mRS, but were not associated with safety outcomes. 

CONCLUSIONS AND RELEVANCE 

In this cohort study of patients with AIS treated with intravenous thrombolysis, brain frailty markers—particularly white matter changes, cortical atrophy, and total brain frailty—were associated with worse outcomes. Consideration of these neuroimaging markers may better inform clinicians and patients about treatment expectations from thrombolytic therapy