Abstract
Introduction:
Patients in the postoperative period of coronary artery bypass grafting (CABG) present respiratory and autonomic dysfunctions. In this sense, cardiovascular physiotherapy has been offered as an indispensable differential for the improvement of the prognosis of this population. Heart rate variability is a simple, noninvasive method to analyze autonomic modulation, as well as the accentuation maneuver of respiratory sinus arrhythmia, which demonstrates the parasympathetic autonomic control over the heart. Five patients undergoing cardiac surgery performed a protocol of cardiovascular physiotherapy in the postoperative period and had their data referring to the preoperative period, the 1st and 4th postoperative days analyzed.
Keywords:
Heart Rate Variability; Respiratory Sinus Arrhythmia Maneuver; Cardiovascular Physiotherapy; Coronary Artery Bypass Grafting
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Mean; 
Patient. ΔIE=difference between the mean of the highest HR values obtained during the inspiratory phase and the mean of the lowest HR values during the expiratory phase of M-RSA; D01=1st postoperative day; D04=4th postoperative day; E/I ratio=mean of the highest RRi values obtained during the expiratory phase divided by the means of the lowest RRi values of the inspiratory phase of the M-RSA; HR=heart rate; HRV=heart rate variability; M-RSA=maneuver of accentuation of respiratory sinus arrhythmia; RMSSD=square root of the mean square of successive differences between adjacent RRi divided by the number of RRi minus one in ms; RRi=R-R intervals; SDNN=standard deviation of all RRi in ms