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Background:    Syncope is characterized by sudden and transient loss of consciousness and postural tone, followed by a fall. From a physiological point of view autonomic nervous dysfunctionis noted in neurocardiogenic syndrome. The aim of this study was to assess the heart rate variability (HRV) in different postures in a patient with neurocardiogenic syncope.
    Case Report:    The patient was a 25-year-old male diagnosed with neurocardiogenic syncope. The protocol was to assess the cardiac autonomic modulation during postural changes: supine, sitting, and standing for 10 minutes in each position. Additionally, the HRV was evaluated during respiratory sinus arrhythmia maneuver. The results were the following: obtained during the assessment of HRV in patient bringer of syncope in neurocardiogenic, supine position and sitting on respiratory sinus arrhythmia maneuver, are arranged, means with the patient in a sitting position, and 7 minutes and 36 seconds to the patient presented the beginning of syncopation, was stopped the record of 7 minutes, to BTV during the patient’s recovery.
    Conclusions:    Although it is know that neurocardiogenic syndrome is link to autonomic control injured, in this study, the patient not presented relevant change in the HRV and pulmonary and cardiovascular parameters during experimental conditional.

Keywords: Nervous System, eurocardiogenic syncope, Autonomic Nervous System