We studied the effects of yohimbine on heart rate (HR) variability in 13 normal controls and 13 patients with panic disorder. Yohimbine produced a significant increase in SD of HR in standing posture in both patients (p = 0.01) and normal controls (p = 0.025). Panic disorder patients had a significant increase in standing absolute midfrequency (MF) power (0.07–0.15 Hz) after administration of yohimbine (p = 0.002). The ratio of post- to preyohimbine standing MF power (0.07–0.15 Hz) during standing was significantly higher in patients as compared with controls (2.3 ± 1.08 vs. 1.33 ± 0.38; p = 0.01), which suggests an increased responsivity of panic disorder patients to the adrenergic effects of yohimbine.
- Heart rate variability
- Normal controls
- Panic disorder
- Spectral analysis-sympathetic
ASJC Scopus subject areas
- Cardiology and Cardiovascular Medicine