Transient monocular visual loss patterns and associated vascular abnormalities.

Bruno, Askiel; Corbett, James J.; Biller, José; Adams, Hadie; Qualls, Clifford

doi:10.1161/01.str.21.1.34

“…The prevalence of ECS in our study (17.1%) was lower than that in white populations. 2,3,5 In contrast to previous study, 3,4 altitudinal/lateralized visual loss and an onset speed of seconds did not occur more frequently in our ICA-stenosis group. Positive visual phenomena, which were considered as benign, were not rare in our ICA-stenosis group.…”

Section: Discussioncontrasting

confidence: 99%

“…The patterns of visual loss were classified into 4 different types (Table), which might imply different underlying pathophysiological changes as reported previously. 4,9 All of the participants received Duplex ultrasonography of cervical and retrobulbar vessels and transcranial color-coded sonography using a sonography system (Acuson) with suitable probes by the same sonographer. More than 50% diameter reduction of extracranial and intracranial carotid arteries was diagnosed according to the ultrasound criteria used in our laboratory.…”

Section: Methodsmentioning

confidence: 99%

Distribution of Carotid Arterial Lesions in Chinese Patients With Transient Monocular Blindness

Hsu

¹

,

Yang

²

,

Chao

³

et al. 2006

Stroke

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Background and Purpose-Asian patients with cerebrovascular diseases have more intracranial atherosclerosis and less extracranial carotid artery stenosis compared with white patients. We systemically evaluated the distribution of carotid arterial lesions in Chinese patients with transient monocular blindness (TMB), which was rarely reported. Methods-We prospectively evaluated 105 consecutive patients with TMB. All of the patients received ocular and physical examinations, blood tests for coagulation function and autoimmune diseases, and ultrasonography of cervical and intracranial arteries. All of the carotid lesions were confirmed by magnetic resonance angiography or cerebral angiography. Results-Of the 36 (34.3%) patients with significant carotid stenosis (Ն50%), 16 (15.2%) had extracranial carotid stenosis; 17 (16.2%) had carotid siphon stenosis; and 3 (2.9%) had both. The duration, onset, and patterns of visual loss were not different between patients with and without carotid arterial lesion. Conclusions-This

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“…The reported percentage of TMB patients without underlying problems were quite variable, ranging from 18% to 81%, depending on the criteria of patient recruitment and the extent of investigations. [1][2][3][4][5] …”

Section: Discussionmentioning

confidence: 99%

“…The prevalence of ipsilateral extracranial carotid arterial lesion among patients experiencing TMB ranges from 16% to 75%, depending on the patient populations and the methods for detecting carotid lesion. [1][2][3][4][5] Chinese patients experiencing stroke or transient ischemic attack (TIA) have less extracranial carotid stenosis (ECS) and more intracranial arterial stenosis compared with the Western world. 6,7 The prevalence of ECS in Asian patients with TMB is rarely reported.…”

mentioning

confidence: 99%

Distribution of carotid arterial lesions in Chinese patients with transient monocular blindness

Hsu¹,

Yang²,

Chao³

et al. 2006

American Journal of Ophthalmology

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Background and Purpose-Asian patients with cerebrovascular diseases have more intracranial atherosclerosis and less extracranial carotid artery stenosis compared with white patients. We systemically evaluated the distribution of carotid arterial lesions in Chinese patients with transient monocular blindness (TMB), which was rarely reported. Methods-We prospectively evaluated 105 consecutive patients with TMB. All of the patients received ocular and physical examinations, blood tests for coagulation function and autoimmune diseases, and ultrasonography of cervical and intracranial arteries. All of the carotid lesions were confirmed by magnetic resonance angiography or cerebral angiography. Results-Of the 36 (34.3%) patients with significant carotid stenosis (Ն50%), 16 (15.2%) had extracranial carotid stenosis; 17 (16.2%) had carotid siphon stenosis; and 3 (2.9%) had both. The duration, onset, and patterns of visual loss were not different between patients with and without carotid arterial lesion. Conclusions-This

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“…How quick was the recovery phase? Our reason for asking is that we believe that very frequent attacks of TMB where the loss of vision starts gradually over seconds, lasts minutes to hours, and recovers with a similar pattern to onset is suggestive of retinal vasospasm [9][10][11][12][13][14]. If in this case the TMB attacks should persist, they may respond to nifedipine [12][13][14], which would then suggest a vasospastic aetiology.…”

mentioning

confidence: 99%