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?:definition
  • A type of chronic orthostatic intolerance lasting greater than or equal to 3 months associated with excessive upright tachycardia in the absence of orthostatic hypotension, plus a constellation of typically daily symptoms that may include lightheadedness, dizziness, nausea, dyspnea, diaphoresis, headache, fatigue and other symptoms of autonomic dysfunction. Excessive tachycardia is defined by present consensus as a heart rate increase of at least 30 beats/min in adults (40 beats/min for adolescents), or a heart rate greater than 120 beats/ min, within 10 min of upright tilt table testing.
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