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A typical patient example, illustrating one minute changes in heart rate (HR) and dominant atrial cycle length (DACL) during the tilt procedure. An increased sympathetic discharge and withdrawal of vagal activity is known to be the physiological response to the head up tilt table test. Increased sympathetic activity during chronic atrial fibrillation may favour the persistence of the arrhythmia and probably reduces the chances for a resumption of sinus rhythm.
