Physiological regularity of cardiovascular and spontaneous respiration series in healthy humans

摘要

All cardiovascular and respiratory series are characterized by a variable regular dynamics in human beings, underlying the complexity of the interaction among the control system, the target organs and external/endogenous stimuli. Conditional corrected entropy (CCE) provides information about the regularity of dynamic signal variations: the technique has been applied to RR interval, non invasive systolic arterial pressure, diastolic arterial pressure and spontaneous respiratory signals, from 15 healthy subjects monitored during quiet supine resting. As a regularity index (RI, ranging from 0 to 1), the difference between 1 and the minimum of CCE has been calculated (mean value ±SD,) RI resulting 0.263±0.090 for respiration, 0.500±0.080 for systolic arterial pressure, and 0.459±009 for diastolic arterial pressure. Heart rate and respiratory dynamics appear more complex than arterial pressure dynamics.