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This study presents results that describe the short term oscillations in SBPV and SVV signals due to calcium channel blockers poisoning with verapamil treated with continuous infusion of levosimendan. In addition, we used average spectra of these oscillations to observe the activity and sympathovagal balance of the autonomic nervous system. Then, we compared the average spectra obtained from both signals. The frequency contents of the average spectra of SVV and SBPV signals to levosimendan treatment of verapamil-poisoned rats were analyzed and related to the activity of sympathetic and parasympathetic tones. In control group, average spectra of SVV and SBPV exhibited a low-frequency band ( LF: 0.03−0.8 Hz) peaked at ∼ 0.4 Hz and a highfrequency ( HF : 0.8−3.0 Hz) peaked at ∼ 1 Hz. LF peak was abolished after verapamil infusion. The LF component of both spectra was observed to recover after continuous infusion of levosimendan. Additionally, a new frequency component was observed at 1 .5 Hz in the spectrum of SBPV. Significant correlations were found between bands of the average spectra in both signals in all groups of treatment studied in this paper. Our results revealed that, like SBPV, SVV can herald useful information regarding the sympathovagal balance and cardiac output improvements.

THE POWER SPECTRA RESPONSE OF STROKE VOLUME AND ARTERIAL BLOOD PRESSURE VARIABILITY SIGNALS TO AUTONOMIC NERVOUS SYSTEM MODULATION OF THE HEART