Correlations between heart rate variability, baroreflex sensitivity, and clinical and echocardiographic variables
| Age | NYHA | LVEF | LVEDD | NSVT+ | RRm | SDNN | rMSSD | |
| Age | ||||||||
| NYHA | 0.08 | |||||||
| LVEF | −0.05 | −0.45 | ||||||
| LVEDD | 0.03 | 0.21 | −0.512-160 | |||||
| NSVT+ | 0.12 | 0.212-160 | −0.232-150 | 0.232-160 | ||||
| RRm | 0.06 | −0.16 | 0.232-150 | −0.03 | −0.04 | |||
| SDNN | −0.07 | −0.192-150 | 0.292-160 | −0.07 | −0.13 | 0.692-160 | ||
| RMSSD | 0.08 | −0.09 | 0.08 | 0.08 | 0.05 | 0.522-160 | 0.582-160 | |
| BRS | −0.13 | −0.222-150 | 0.14 | 0.09 | −0.08 | 0.09 | 0.192-150 | −0.01 |
↵2-150 p < 0.05;
↵2-160 p < 0.01.
BRS, baroreflex sensitivity; LVEDD, left ventricular end diastolic diameter; LVEF, left ventricular ejection fraction; NSVT+, presence of non-sustained ventricular tachycardia; RRm, the mean of all coupling intervals between normal beats; rMSSD, the square root of the mean of the squared differences between adjacent normal RR intervals; SDNN, the standard deviation of all normal RR intervals.