Curative Effect of Interventional Therapy and Neurological Changes in Ischemic Stroke of Posterior Circulation Evaluated by Magnetic Resonance Imaging under Genetic Algorithm

Objective. This study aimed to evaluate the improvement and neurological function changes of patients with ischemic stroke in the posterior circulation before and after interventional therapy using magnetic resonance imaging (MRI) under genetic algorithm and compressed sensing algorithm. Methods. Thirty-six patients with posterior circulation ischemia who visited the interventional cerebrovascular disease area were included in this study. The treatment effect was observed through abnormal signal changes in the lesion area on each sequence of MRI images before and after treatment. The National Institutes of Health Stroke Scale (NIHSS) was used for the evaluation of the changes in neurological function. Results. The real data experiment results suggested that the peak signal-to-noise ratio (PSNR) = 39.33 and structure similarity (SSIM) = 0.96 in the algorithm reconstructed image, which showed no significant difference with the simulation experiment results of PSNR = 35.19 and SSIM = 0.96 ( P < 0.05 ). In addition, the stenosis rate after interventional treatment (13.89%) was substantially lower than that before treatment (91.67%) ( P < 0.05 ). Cerebral blood flow (CBF) of the bilateral occipital lobes and cerebellum after six months of treatment was higher than that before treatment ( P < 0.05 ), and the incidence of postoperative restenosis was 11.11% (4/36). Conclusion. The combination of genetic algorithm and compressed sensing algorithm had a good effect on MRI image processing. The posterior circulation ischemia interventional stent implantation can effectively improve the stenosis of the vertebral artery and vertebral basilar artery as well as the cerebral tissue perfusion in the ischemic area, which improved the clinical symptoms substantially and reduced the probability of restenosis.

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Abstract TP400: The Differences of Vessel Wall Features Between the Anterior and Posterior Brain Arteries Detected by High Resolution Magnetic Resonance Imaging in Patients With Acute Ischemic Stroke

Stroke ◽

10.1161/str.51.suppl_1.tp400 ◽

2020 ◽

Vol 51 (Suppl_1) ◽

Author(s):

Xiangyan Chen ◽

Lu Zheng ◽

Jia LI ◽

Wenjie Yang

Keyword(s):

Magnetic Resonance Imaging ◽

Ischemic Stroke ◽

Magnetic Resonance ◽

High Resolution ◽

Acute Ischemic Stroke ◽

Vessel Wall ◽

Posterior Circulation ◽

Intraplaque Hemorrhage ◽

Resonance Imaging ◽

Anterior Circulation

Backgrounds: The purpose of this study was to investigate vessel wall features visualization by high resolution magnetic resonance imaging (HRMRI) in a series of ischemic stroke patients and to identify differences between lesions in the anterior and posterior circulation. Methods: We consecutively recruited Chinese patients with acute ischemic stroke or transient ischemic attack from 2016 to 2018. All patients were scanned at 3T magnetic resonance imaging. We evaluated pre-and post-contrast cross-sectional views of M1 and M2 segments of middle cerebral arteries (MCAs), basilar arteries (BA) and V4 segments of vertebral arteries (VAs). Results: A total of 74 patients (males 52.3%; median age 62 years old) were included in this study, among which, 234 lesions were identified on HRMRI, including 117 MCA lesions, 26 BA lesions, and 91 VA lesions. The sensitivity and specificity of MRA for diagnosing stenosis in anterior circulation were 89.3% (95% CI, 81.8%- 94.2%) and 50.0 (95% CI, 9.2%- 90.8%). The sensitivity and specificity of MRA for diagnosing stenosis in posterior circulation were 73.2% (95% CI, 63.9%- 80.9%) and 40.0 (95% CI, 7.3%- 83.0%). VA had a significantly higher contrast enhancement index (43.71± 7.74, p <0.016) than MCA (23.32± 2.46) or BA (22.69± 5.31) . Anterior circulation plaques had higher degree of stenosis (anterior versus posterior: 68.5% vs. 62.9%, p =0.036), more eccentric distribution (anterior versus posterior: 70.1% versus 53.8%, p =0.015) and higher rate of intraplaque hemorrhage (anterior versus posterior: 17.1% versus 7.7%, p =0.046). The plaques in posterior circulation had a thicker lesion wall (posterior versus anterior 16.58± 8.25 mm 2 vs. 9.10± 4.07 mm 2 , p <0.001) and higher enhancement index (posterior versus anterior 39.04± 8.50 vs. 23.32± 2.46, p <0.001) than the plaques in anterior circulation. Conclusions: The lesions in posterior circulations could be obscure on MRA. The area stenosis, intraplaque hemorrhage and enhancement index differed between circulations.

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STROKE ISKEMIK DENGAN MANIFESTASI DIZZINESS/VERTIGO TERISOLASI

Majalah Kedokteran Neurosains Perhimpunan Dokter Spesialis Saraf Indonesia ◽

10.52386/neurona.v37i2.116 ◽

2020 ◽

Vol 37 (2) ◽

Author(s):

Diyan Anita Sari ◽

Sri Sutarni ◽

Ismail Setyopranoto

Keyword(s):

Magnetic Resonance Imaging ◽

Ischemic Stroke ◽

Magnetic Resonance ◽

Diffusion Weighted Imaging ◽

Posterior Inferior Cerebellar Artery ◽

Posterior Circulation ◽

Resonance Imaging ◽

Acute Vestibular Syndrome ◽

Cerebellar Artery ◽

Magnetic Resonance Imaging Mri

ISCHEMIC STROKE PRESENTS WITH ISOLATED DIZZINESS/VERTIGOABSTRACTDizziness/vertigo, unstable walking or loss of balance are symptoms in about 50% of stroke cases. However, only about 20% are accompanied by focal neurological signs. In the last decade, there is increasing evidence that vertigo can be the only ischemic symptom of posterior circulation stroke without a focal sign. The purpose of this systematic review is to examine the literature on ischemic stroke with the manifestation of isolated dizziness/vertigo. The literature search is done through several electronic database (Pubmed, Ebscohost, and Proquest) from 2000 to 2017 using keywords; isolated vertigo, isolated dizziness, ischemic stroke, vertebrobasilar, posterior stroke, magnetic resonance imaging (MRI). Six articles were obtained that meet the criteria. Approximately 9-10% of patients with isolated dizziness/vertigo who had a history of vascular risk factors, found to have infarct lesions from MRI diffusion weighted imaging (DWI) examination. In this case, the territory of posterior inferior cerebellar artery (PICA) is most often involved. Acute ischemic stroke can not be excluded only on the basis of negative DWI examination results. Head impulse, nystagmus, and test of skew (HINTS) plus examination may identify acute vestibular syndrome with a central cause with better accuracy than MRI DWI at the onset of symptom.Keywords: Acute vestibular syndrome, ischemic stroke, isolated dizziness, isolated vertigo, posterior circulation strokeABSTRAKDizziness/vertigo, berjalan tidak stabil atau kehilangan keseimbangan merupakan gejala pada sekitar 50% kasus stroke. Namun, hanya sekitar 20% disertai tanda neurologis fokal. Pada dekade terakhir, semakin banyak bukti bahwa vertigo dapat sebagai satu-satunya gejala iskemik sirkulasi posterior tanpa tanda fokal. Tujuan penulisan tinjauan sistematik ini adalah untuk mengkaji literatur tentang stroke iskemik dengan manifestasi hanya dizziness/vertigo terisolasi. Pencarian literatur dilakukan melalui database elektronik (Pubmed, Ebscohost, dan Proquest) dari tahun 2000 hingga 2017 dengan kata kunci; isolated vertigo, isolated dizziness, ischemic stroke, vertebrobasilar, posterior stroke, magnetic resonance imaging (MRI). Didapatkan 6 artikel yang memenuhi kriteria. Sebanyak 9-10% dari pasien dengan dizziness/vertigo terisolasi yang memiliki riwayat faktor risiko vaskular, ditemukan lesi infark dari pemeriksaan MRI diffusion weighted imaging (DWI). Dalam hal ini, teritori posterior inferior cerebellar artery (PICA) yang paling sering terlibat. Stroke iskemik akut tidak dapat disingkirkan hanya berdasar hasil pemeriksaan DWI negatif. Pemeriksaan head impulse, nystagmus, and test of skew (HINTS) plus dapat mengidentifikasi sindrom vestibular akut dengan penyebab sentral dengan akurasi yang lebih baik dibanding MRI DWI di awal onset gejala.Kata kunci: Dizziness terisolasi, sindrom vestibular akut, stroke iskemik, stroke sirkulasi posterior, vertigo terisolasi

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Use of 3-Dimensional, Black-Blood, Contrast-Enhanced, T1-Weighted Magnetic Resonance Imaging to Identify Vascular Occlusion in the Posterior Circulation After Acute Ischemic Stroke

Journal of Stroke and Cerebrovascular Diseases ◽

10.1016/j.jstrokecerebrovasdis.2019.104373 ◽

2019 ◽

Vol 28 (11) ◽

pp. 104373

Author(s):

Gyung Ho Chung ◽

Seung Bae Hwang ◽

Hyo Sung Kwak

Keyword(s):

Magnetic Resonance Imaging ◽

Ischemic Stroke ◽

Magnetic Resonance ◽

Vascular Occlusion ◽

Posterior Circulation ◽

Black Blood ◽

Resonance Imaging ◽

3 Dimensional ◽

Contrast Enhanced ◽

Weighted Magnetic Resonance Imaging

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Regional Gas Exchange Measured by 129 Xe Magnetic Resonance Imaging Before and After Combination Bronchodilators Treatment in Chronic Obstructive Pulmonary Disease

Journal of Magnetic Resonance Imaging ◽

10.1002/jmri.27662 ◽

2021 ◽

Author(s):

David G. Mummy ◽

Erika M. Coleman ◽

Ziyi Wang ◽

Elianna A. Bier ◽

Junlan Lu ◽

...

Keyword(s):

Magnetic Resonance Imaging ◽

Chronic Obstructive Pulmonary Disease ◽

Magnetic Resonance ◽

Gas Exchange ◽

Pulmonary Disease ◽

Chronic Obstructive ◽

Resonance Imaging ◽

Obstructive Pulmonary Disease ◽

Before And After

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“Yokoyama procedure” efficacy on non-highly myopic patients with acquired esotropia and hypotropia

European Journal of Ophthalmology ◽

10.1177/1120672119850684 ◽

2019 ◽

Vol 30 (4) ◽

pp. 676-679

Author(s):

Massimiliano Serafino ◽

Matteo Scaramuzzi ◽

Edoardo Villani ◽

Paolo Nucci

Keyword(s):

Magnetic Resonance Imaging ◽

Magnetic Resonance ◽

Axial Length ◽

Lateral Rectus ◽

Inclusion Criteria ◽

Resonance Imaging ◽

Spherical Equivalent Refraction ◽

Before And After ◽

Weighted Magnetic Resonance Imaging ◽

The Mean

Objective: To assess the efficacy of “Yokoyama Procedure,” on non-highly myopic patients with acquired esotropia and hypotropia. Methods: The study involved 10 eyes of 5 patients with eso-hypotropia. Inclusion criteria were acquired esotropic-hypotropic strabismus with lateral rectus inferior displacement and superior rectus nasal displacement confirmed by magnetic resonance imaging, refractive errors between ±6 D, and axial length < 27 mm. Range of full duction movements and maximum angles of abduction-sursumduction was measured in each eye before and after surgery. All patients underwent T1- and T2-weighted magnetic resonance imaging. The surgery was aimed at creating a junction between the muscle bellies of the superior and lateral rectus muscles. This junction was made approximately 14 mm behind the insertions using a non-absorbable mersilene 5/0 suture (Yokoyama procedure). Results: Mean patient age was 64.8 ± 4.8 years. The mean globe axial length was 25.4 ± 0.76 mm and a mean corresponding spherical equivalent refraction of −3.7 ± 1.7 D was observed. Eight eyes on 10 had mild limitation in abduction, while the remaining 2 had no limitation. Three out of 10 eyes showed a moderate limited sursumduction, 5 eyes were categorized as mild, and the remaining 2 had no limitation. No evident post-operative limitation was present in any eye, in both abduction and sursumduction (p < 0.01). Pre-operative esotropia and hypotropia were, respectively, 32 ± 11 prismatic diopters and 25 ± 5 prismatic diopters, and they were significantly reduced after surgery as 9 ± 1.7 prismatic diopters and 6 ±1 prismatic diopters (p = 0.043), respectively. Conclusion: Yokoyama procedure is an effective, fast, reversible procedure to face eso-hypotropic acquired strabismus, even in patients with a clear magnetic resonance imaging displacement of superior and lateral rectus muscles, and absence of globe dislocation and of elevated myopia.

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