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Vasa nervorum is a collective term for a complex microcirculation that provides nutrients to peripheral nerves. Vasa nervorum is known to be disturbed in diabetic neuropathy, mononeuritis multiplex, vasculitic neuropathy and few cases of facial nerve paralysis.1 Sonography has been used to detect focally increased intraneural blood flow in carpal tunnel syndrome.2 In neurolymphomatosis, enlarged nerves showed qualitatively increased blood flow within the area of thickening.3 Similar findings of increased blood flow signals were observed in leprosy.4 As inflammatory vasodilation increases intraneural blood flow in an acute postdenervation period,5 we hypothesised that intraneural blood flow in inflammatory neuropathies becomes abnormal, by employing a quantitative method.
We conducted a prospective study from June 2015 to December 2015. Institutional Review Board approved this study. The participants signed a written consent.
The first group was the control group, which includes healthy non-smoking participants without clinical signs by neurological examination or symptoms of a neurological disease, no known comorbidities such as hypertension, dyslipidaemia and diabetes mellitus and without a history of traumatic injuries. The second group was the inflammatory neuropathy group, which includes participants diagnosed with chronic inflammatory demyelinating polyneuropathy (CIDP), Guillain-Barré syndrome (GBS) and multifocal motor neuropathy (MMN). The third was grouped as other peripheral nerve diseases as disease control, which includes participants diagnosed with amyotrophic lateral sclerosis (ALS) and Charcot-Marie-Tooth Disease type 1A …
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