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Colegio de Medicina Interna de México.

2020, Number 2

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Med Int Mex 2020; 36 (2)

Behaviour of heart rate and blood gas analysis based on dynamical systems

Medina-Araujo SM, Rodríguez-Velásquez JO, Prieto-Bohórquez SE

Language: Spanish
References: 30
Page: 153-158
PDF size: 177.10 Kb.


ABSTRACT

Background: Nonlinear dynamics have allowed the development of diagnostic methodologies of cardiac dynamics and the evaluation of the behavior of different hemodynamic variables.
Objective: To characterize the chaotic behavior of the heart rate and parameters of the blood gases of patients of the intensive care unit within the framework of dynamic systems theory.
Material and Method: A study was done including clinical reports of blood gases and continuous electrocardiographic records were selected from patients of the intensive care unit. Heart rate, pressure of arterial and venous carbon dioxide, and venous oxygen saturation were systematized. Then, chaotic attractors of these variables were generated in the delay map, and the maximum and minimum values of the attractors were established.
Results: There were included 25 clinical reports. The minimum and maximum values of the attractors of venous oxygen saturation were between 22.1 and 97.3%. The minimum and maximum values of the attractors of PaCO2 were between 17 and 97.9 mmHg. The minimum and maximum values of the attractors of PvCO2 ranged from 14.4 to 64.1 mmHg. Heart rate values were found between 62 and 210 lat/min.
Conclusions: It was possible to characterize the chaotic behavior of the parameters of blood gases and heart rate, in the context of dynamic systems theory.


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