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Signal Intensity Gradient in Cerebral Arteries

NCT05495191 · Status: COMPLETED · Type: OBSERVATIONAL · Enrollment: 294

Last updated 2022-08-10

No results posted yet for this study

Summary

Arterial wall shear stress (WSS) contributes to atherosclerosis from its inception, progression, and disruption of plaque. However, there is no previous study for an association between cerebral artery WSS and clinical outcome in patients with ischemic stroke in lenticulostriate artery.

The researchers aimed to investigate whether the signal intensity gradient (SIG) from Time-of-Flight Magnetic Resonance Angiography (TOF MRA) in cerebral arteries, as a surrogate measure of arterial WSS, is associated with clinical outcome, which was determined with modified Rankin Scale (mRS).

The patients (n=294) with the lenticulostriate artery infarction were collected in 3 hospitals with variable locations and sizes (Gunsan, Jeonju, and Seoul). For a clinical outcome, National Institute of Health Stroke Scale (NIHSS) and modified Rankin Scale (mRS) were checked serially from the date of admission. The mRS 2 or less at the 7th day or discharge was defined as a favorable outcome. The arterial SIGs were measured concurrently in both internal carotid, anterior/middle/posterior cerebral, vertebral arteries, and basilar artery from TOF MRA on initial diagnosis. The independent association between the clinical outcome and cerebral arterial SIG was analyzed adjusting for all the possible potential confounders.

Conditions

  • Ischemic Stroke, Acute

Interventions

DIAGNOSTIC_TEST

Signal intensity gradient

In time-of-flight (TOF) MRA, The signal intensities at the iso-point (Φa; signal intensity at position A \[Xa\] along the arterial contour line) and at the inner point (Φb; signal intensity at position B \[Xb\]) were calculated by using a trilinear interpolation algorithm based on the positions and signal intensities in the eight neighboring voxels. The signal intensities of TOF-MRA were normalized to eliminate the offset and scale effects across the MRA datasets of participants. For each iso-point (position A), the SIG was calculated from the difference in signal intensities between points A and B as follows: Scalar SIG, SI/mm = (Φb - Φa) / │Xb - Xa│ (1) Vector SIG, SI/mm = (Φb - Φa) n / │Xb - Xa│ (2)

Sponsors & Collaborators

  • Korean Society of Neurosonology

    collaborator UNKNOWN

  • Ministry of SMEs and Startups, Republic of Korea

    collaborator UNKNOWN

  • Korean Neurological Association

    collaborator UNKNOWN

  • Chonbuk National University Hospital

    lead OTHER

Principal Investigators

  • Chan-Hyuk Lee, Dr. · Jeonbuk National University Hospital

Eligibility

Min Age
18 Years
Sex
ALL
Healthy Volunteers
No

Timeline & Regulatory

Start
2021-05-10
Primary Completion
2022-05-05
Completion
2022-07-23

Countries

  • South Korea

Study Locations

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Read the full study record

This page highlights key information. For complete eligibility criteria, study locations, investigator contacts, and the full protocol, visit the original record on ClinicalTrials.gov.

View NCT05495191 on ClinicalTrials.gov