Autonomic dysfunction in patients with orthostatic dizziness: Validation of orthostatic grading scale and comparison of Valsalva maneuver and head-up tilt testing results

Abstract Objectives To investigate whether the Korean version of the Orthostatic Grading Scale (KOGS) is a reliable and valid measure for evaluating the severity of symptoms of orthostatic intolerance (OI) and to compare the diagnostic accuracy of Valsalva maneuver (VM) and head-up tilt test (HUTT)...

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