Screening of Endovascular Thrombectomy With MRI in Acute Ischemic Stroke

Tianjin Huanhu Hospital

Status: Completed

Conditions: Image Evaluation; Fluid-attenuated Inversion Recovery Sequence Vascular Hyperintensity-diffusion-weighted Imaging Mismatch(FVH-DWI Mismatch); Endovascular Thrombectomy

Treatments: Diagnostic Test: Surgical criteria

Study type: Observational

Funder types: Other

Identifiers

NCT06213870

TJHH-2023-WM51

Details and patient eligibility

About

The goal of this observational study is to learn about the role of MRI evaluation based on FVH-DWI mismatch principle in preoperative evaluation of endovascular thrombolectomy.

The main questions it aims to answer are:

• The consistency between MRI and perfusion examination in determining EVT indications.
• The consistency of functional independence rate between patients screening with MRI and perfusion.

Full description

MRI is the preferred imaging mode in many centers,for the diffusion-weighted imaging (DWI) sequences are highly sensitive to acute cerebral ischemia.In addition, MRI does not require intravenous contrast agent, which is simpler and more popular than perfusion.Fluid-attenuated inversion recovery (FLAIR)sequence vascular hyperintensity(FVH) is defined as focal, serpentine, or linear hyperintensity that usually occurs in the Sylvian fissure and is associated with large-vessel occlusion or stenosis.The FVH-DWI mismatch(defined as the FVH extended beyond the boundary of the DWI cortical lesions) had been confirmed has excellent sensitivity and specificity in predicting PWI-DWI mismatch.It is not well established whether MRI based on FVH-DWI mismatch and perfusion evaluation differ in determining EVT indications and outcomes.

The main objectives of this study were to (1) determine the proportion of patients eligible for EVT surgery selected by MRI based on FVH-DWI mismatch vs perfusion in a large multicenter registry and (2) identify statistical differences in functional outcomes and safety outcomes between the two evaluation methods.

Patients with ischemic stroke with anterior-circulation large-vessel occlusion in the late (6-24 h) time window from real-world, single center retrospective cohort registry were compared.In the MRI group, patients with FVH-DWI mismatch underwent EVT surgery or were otherwise treated with medication.In the perfusion group, surgical indications referring the DEFUSE 3 standards. The primary outcome was 90-day functional independence rate (mRS score ≤2) in all patients included(including EVT patient and medication patients).Safety outcomes included symptomatic intracranial hemorrhage (sICH), and 90-day mortality.

Enrollment: 309 patients

Sex: All

Ages: 18+ years old

Volunteers: No Healthy Volunteers

Inclusion criteria

• (1) age ≥ 18 years old;
• (2) symptoms consistent with acute ischemic stroke and an onset time of 6-24h;
• (3) CT ASPECTS score≥6 points;NIHSS≥6points; modified Rankin scale (mRS) of 0-2 points prior to stroke;
• (4) internal carotid artery (ICA) and/or M1 segment of middle cerebral artery (MCA-M1) and M2 proximal segment occlusion with definite diagnosis.
• (5)agree to comply with the protocol follow-up requirements.

Exclusion criteria

• (1)Image unanalyzable.
• (2)3 months follow-up was not completed

Trial design

309 participants in 2 patient groups

MRI group

Description:

MRI Images were acquired on a 3T Siemens Prisma scanner (Siemens AG, Munich, Germany).Image sequences and typical parameter ranges were diffusion tensor imaging (repetition time \[TR\], 5200ms; echo time \[TE\], 80 ms; 4mm slice thickness; 40 slices) by using SE-EPI sequence; T1 imaging (TR, 240 ms; TE, 2.47 ms; 5 mm slice thickness; 17 slices) by using SE sequence;T2 imaging (TR, 4480 ms; TE, 99 ms; 4 mm slice thickness; 24 slices) by using FSE sequence; FLAIR imaging (TR, 8500 ms; TE, 95 ms; 5 mm slice thickness; 21 slices) by using IR sequence; time-of-flight magnetic resonance angiography images (TR, 20 ms; TE, 3 ms; 0.55 mm slice thickness; 40 slices) by using 3D-TOF sequence; In the MRI group, patients with FVH-DWI mismatch were considered to have EVT indications and were treated with EVT, while patients without FVH-DWI mismatch were treated with medication.

Treatment:

Diagnostic Test: Surgical criteria

Perfusion group

Description:

The protocol of CT Perfusion was as follows: 100 mm coverage in the z-axis, tube voltage, 80 kV; tube current, 120 mA; section thickness, 5 mm. Twenty-four consecutive spiral acquisitions with 0.28 seconds of rotation time and 1.70 seconds of inter scan delay time were performed. Patients in the perfusion group were treated with EVT when there exist perfusion mismatch(defined as regional cerebral blood flow (\<30%) was \< 70 ml with mismatch ratio ≥ 1.8 and mismatch volume ≥ 15 ml), and were treated with medication when there was no perfusion mismatch.

Treatment:

Diagnostic Test: Surgical criteria