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The difference in sympathovagal activity preceding non-sustained ventricular tachycardia (NSVT) was examined between patients with and without a circadian rhythm. Thirty-three patients' Holter monitoring data (41 NSVT episodes) were analyzed regarding the frequency domain measures (low-frequency component [LF: 0.04-0.15 Hz], high-frequency component [HF: 0.15-0.4 Hz], and the ratio of LF to HF [LF/HF]) for each 15-min average from 120 min before each episode of NSVT. The presence of a circadian rhythm was accepted when the rhythm adaptation was significant by cosinor analysis and the acrophase was located at night (22.00-06.00h) in HF (HF-positive group, n=17), and during the daytime (10.00-20.00h) in LF/HF (LF/HF-positive group, n=12). The negative groups were identified by the absence of a circadian rhythm (HF-negative group, n=16; LF/HF-negative group, n=21). The serial changes in the HF power before NSVT were significantly different between the HF-positive and -negative groups (p&lt;0.05). The HF increased from 75-60 min before NSVT in the HF-positive group, whereas the HF decreased from 60-45 min in the HF-negative group. The serial changes in the LF/HF ratio were not significantly different between the LF/HF-positive and -negative groups. Thus, the circadian rhythmicity of vagal activity seems to have an important role in the genesis of NSVT.

Role of Circadian Rhythmicity in the Heart Rate Variability Preceding Non-Sustained Ventricular Tachycardia