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We performed spectral analysis on the QRS complex of the electrocardiogram obtained using standard limb leads, sampled at 500 Hz with 12 bit precision in 20 normal subjects and 15 patients with panic disorder. We divided the frequency range of the QRS into two bands based on spectral patterns before and after the postural challenge -- mid frequency (MF): 7.8-20 Hz; and high frequency (HF): 21-250...
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