RESULTS	Group A patients had higher post-treatment 24-hour HRV than those in Group B. SDNN ( standard deviation of the average normal RR intervals in the entire ECG recording ) , SDANN ( standard deviation of the average normal RR intervals for all five minute segments of an entire ECG recording ) and SDNN indices in Group A were significantly higher than in Group B ( 90 + / - 33 ms vs 41 + / - 12 ms , 78 + / - 32 ms vs 36 + / - 11 ms , and 37 + / - 19 ms vs 16 + / - 7 ms , respectively , all p < 0.05 ) .\