811 Short-term spectral analysis of heart rate variability during supine-standing-supine test in patients with malignant arrhythmias and normal function of left ventricle

The beat-to-beat heart rate of the lizard, Gallotia galloti, at rest shows short-term oscillations, the frequency of which varies with body temperature. Spectral analysis of the heart rate variability signal shows that, above 20 degrees C, two major frequency components are present: the first component has a mean frequency ranging from 0.032 at 20 degrees C to 0.070 Hz at 35 degrees C and the second from 0.039 at 20 degrees C to 0.10 Hz at 35 degrees C of body temperature. The beat-to-beat heart rate variability does not seem to be correlated with ventilatory activity. The two spectral components could be associated as in mammals with the activity of the control systems that regulate the circulation, especially with the cutaneous vasomotor thermoregulatory and endogenous pressure vasomotor activities. Transient interactions between both components are described.

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Evaluation of Autonomic Nervous System Changes Using Short-term Heart Rate Variability During Apnea

10.21203/rs.3.rs-29549/v1 ◽

2020 ◽

Author(s):

Baolin He ◽

Wenyu Li ◽

Xiaotong Zhang ◽

Yanan Wu ◽

Jing Liu ◽

...

Keyword(s):

Heart Rate ◽

Heart Rate Variability ◽

Nervous System ◽

Autonomic Nervous System ◽

Physiological State ◽

Cardiac Activity ◽

Normal Function ◽

Short Term ◽

Autonomic Nervous ◽

Respiratory State

Abstract Background: Frequent cessations of respiration can greatly increase the prevalence rate of arrhythmia. It has been confirmed that cardiac activity is regulated by autonomic nervous system (ANS). And heart rate variability (HRV) is widely used as a method to evaluate the function of ANS. Therefore, we analyzed whether apnea can affect the balance and normal function of ANS using short-term HRV indices. Methods: Forty-five healthy subjects were asked to breathe normally and hold their breathing to simulate 10 times apnea. Thirty-six patients from the dataset of a sleep laboratory for the diagnosis of sleep disorders with 10 times apnea were included in analysis. We calculated short-term HRV indices of subjects in normal respiratory and apneic states, respectively. Results: Compared with normal respiratory state, respiration cease would lead to the values of the mean-RR, nLF, LF/HF, and α1 were significantly increase whereas the values of rMSSD and nHF were significantly decrease. Conclusions: Cessations of respiration would lead to an imbalance in function of ANS, as well as an increase in fractal characteristics of the heart. These changes in physiological state are likely to induce and cause the occurrence of arrhythmia, which is regulated by ANS.

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VARIABILITY OF ARTERIAL PRESSURE AT SHORT-TERM TIME INTERVALS

Issues of radio electronics ◽

10.21778/2218-5453-2019-1-72-77 ◽

2019 ◽

pp. 72-77

Author(s):

S. M. Zakharov

Keyword(s):

Blood Pressure ◽

Heart Rate ◽

Heart Rate Variability ◽

Spectral Analysis ◽

Arterial Pressure ◽

Real Time ◽

Time Interval ◽

Short Term ◽

Time Intervals ◽

Short Time

The time and spectral analysis of blood pressure signals (BP of systolic, diastolic, pulse) obtained in real time and reflecting the work of the heart at short time intervals is presented. As a time interval, a sequence of one hundred cardiac cycles was chosen. The main parameters of variability are determined. The proposed method of analysis is an analogue of heart rate variability (HRV), based on the study of RR cardiointervals. Spectral analysis of blood pressure signals shows differences in the degree of orderliness or disorder of individual frequencies or the spectrum as a whole. The presented methodology will allow to reveal further features for use in the diagnosis of various pathologies.

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