The complexity of ECG signal based on multifractal theories and its nonlinear dynamical mechanism

Electrocardiogram (ECG) signal analysis has received special attention of the researchers in the recent past because of its ability to divulge crucial information about the electrophysiology of the heart and the autonomic nervous system activity in a noninvasive manner. Analysis of the ECG signals has been explored using both linear and nonlinear methods. However, the nonlinear methods of ECG signal analysis are gaining popularity because of their robustness in feature extraction and classification. The current study presents a review of the nonlinear signal analysis methods, namely, reconstructed phase space analysis, Lyapunov exponents, correlation dimension, detrended fluctuation analysis (DFA), recurrence plot, Poincaré plot, approximate entropy, and sample entropy along with their recent applications in the ECG signal analysis.

Download Full-text

A nonlinear dynamical mechanism of polar motion

Chinese Astronomy and Astrophysics ◽

10.1016/s0275-1062(99)90116-9 ◽

1999 ◽

Vol 23 (1) ◽

pp. 129

Keyword(s):

Polar Motion ◽

Dynamical Mechanism ◽

Nonlinear Dynamical

Download Full-text

Stability Analysis of Regular and Chaotic Ca2+ Oscillations in Astrocytes

Discrete Dynamics in Nature and Society ◽

10.1155/2020/9279315 ◽

2020 ◽

Vol 2020 ◽

pp. 1-9

Author(s):

Min Ye ◽

Hongkun Zuo

Keyword(s):

Equilibrium Points ◽

Cell Types ◽

Mechanism Analysis ◽

Biological Experiment ◽

Dynamical Mechanism ◽

Nonlinear Dynamical ◽

Dynamical Behaviors ◽

The Stability

Ca2+ oscillations play an important role in various cell types. Thus, understanding the dynamical mechanisms underlying astrocytic Ca2+ oscillations is of great importance. The main purpose of this article was to investigate dynamical behaviors and bifurcation mechanisms associated with astrocytic Ca2+ oscillations, including stability of equilibrium and classification of different dynamical activities including regular and chaotic Ca2+ oscillations. Computation results show that part of the reason for the appearance and disappearance of spontaneous astrocytic Ca2+ oscillations is that they embody the subcritical Hopf and the supercritical Hopf bifurcation points. In more details, we theoretically analyze the stability of the equilibrium points and illustrate the regular and chaotic spontaneous calcium firing activities in the astrocytes model, which are qualitatively similar to actual biological experiment. Then, we investigate the effectiveness and the accuracy of our nonlinear dynamical mechanism analysis via computer simulations. These results suggest the important role of spontaneous Ca2+ oscillations in conjunction with the adjacent neuronal input that may help correlate the connection of both the glia and neuron.

Download Full-text

A nonlinear dynamical mechanism for bruit generation by an intracranial saccular aneurysm

Journal of Mathematical Biology ◽

10.1007/s002850200156 ◽

2002 ◽

Vol 45 (5) ◽

pp. 441-460 ◽

Cited By ~ 6

Author(s):

Henry W. Haslach

Keyword(s):

Saccular Aneurysm ◽

Dynamical Mechanism ◽

Nonlinear Dynamical

Download Full-text

Noise in Nonlinear Dynamical Systems

10.1017/cbo9780511897825 ◽

1989 ◽

Cited By ~ 9

Keyword(s):

Dynamical Systems ◽

Nonlinear Dynamical Systems ◽

Nonlinear Dynamical

Download Full-text

ECG signal feature extraction and classification using wavelet transform and neural network

PsycEXTRA Dataset ◽

10.1037/e605272012-004 ◽

2011 ◽

Author(s):

Thomas Sri Widodo

Keyword(s):

Neural Network ◽

Feature Extraction ◽

Wavelet Transform ◽

Ecg Signal

Download Full-text

The Nonlinear Dynamical Hypothesis in Science Education Problem Solving: A Catastrophe Theory Approach

PsycEXTRA Dataset ◽

10.1037/e667022007-001 ◽

2006 ◽

Author(s):

Dimitrios Stamovlasis

Keyword(s):

Science Education ◽

Problem Solving ◽

Catastrophe Theory ◽

Theory Approach ◽

Nonlinear Dynamical ◽

Dynamical Hypothesis

Download Full-text

Study on Cuff-Less Blood Pressure Measurement Based on Electrocardiography and Photoplethysmography Signal

ICONIET PROCEEDING ◽

10.33555/iconiet.v2i3.34 ◽

2019 ◽

Vol 2 (3) ◽

pp. 206-214

Author(s):

Putri Indes Oktabriani ◽

Fuad Ughi ◽

Aulia Arif Iskandar

Keyword(s):

Blood Pressure ◽

Pressure Measurement ◽

Blood Pressure Monitoring ◽

Blood Pressure Measurement ◽

Ecg Signal ◽

Optimum Location ◽

Blood Pressure Monitor ◽

Pressure Monitor ◽

Left Hand ◽

Measure Blood Pressure

The continuous blood pressure measurement research is widely known for helpingthe development of ambulatory blood pressure monitoring where it measures blood pressureevery 15 to 30 minutes throughout the day. The cuff is a problem for the patient withAmbulatory Blood Pressure Monitor. It can make a person feel uncomfortable and must staystill when the cuff starts to inflate. It is limiting and disturbing their daily activity when thedevice is starting to measure the blood pressure. Blood pressure measurement without cuff isbeing proposed in this research, called cuff-less blood pressure measurement. It will be based onPhotoplethysmography (PPG) and Electrocardiography (ECG) signal analysis. ECG (Lead 1,Lead 2, and Lead 3) with PPG signal produced from index finger on the left hand are comparedand analyzed. Then the relation of PPG and ECG signal and the optimum location for daily usecan be obtained. The optimum location will be based on the electrode’s position that producedthe optimum ECG lead Signal to measure blood pressure. Based on the result, PPG and ECGsignal have a linear relation with Blood Pressure Measurement and Lead 1 is more stable inproducing the ECG signal. The equation from Lead 1 appeared as one of the optimum equationsfor measuring Systolic Blood Pressure (SBP) or Diastolic Blood Pressure (DBP).

Download Full-text