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Postprandial cerebral infarction resolved by extracranial-intracranial bypass surgery.
ENeurologicalSci 2020 December
A 51-year-old man with type 2 diabetes mellitus was admitted with a 2-month history of repeated episodes of transient aphasia and right hemiparesis after food intake. His blood pressure (BP) fell when the neurological deficits developed. The fall in BP after each meal was confirmed by 24-h ambulatory blood pressure monitoring (ABPM), which established the diagnosis of postprandial hypotension (PPH). Diffusion-weighted magnetic resonance imaging of the brain showed multiple high-intensity lesions at the borderzone between the anterior and middle cerebral artery (MCA) territories in the left hemisphere. Digital subtraction angiography showed tapered occlusion at the origin of the left internal carotid artery (ICA). Despite sufficient antiplatelet therapy and medication for PPH, the transient symptoms remained. Positron emission tomography scanning using H2 15 O showed decreased cerebral blood flow with increased oxygen extraction fraction in the left MCA territory. As the symptomatic left ICA occlusion was intractable, an extracranial-intracranial (EC-IC) bypass surgery was conducted without any perioperative complications. Although PPH remained, cerebrovascular ischemic events including repeated transient ischemic attack disappeared for 2 months after surgery. The coincidence of stroke with ABPM-proved transient hypotension suggested that the brain infarcts were caused by hemodynamic changes related to PPH co-existent with the chronic left ICA occlusion. ABPM is useful in evaluating hemodynamic infarcts associated with BP fluctuation, and should be considered for patients with chronic ICA occlusion. In addition, EC-IC bypass may be a treatment option for symptomatic chronic ICA occlusion due to PPH.
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