ONE AND FOUR WEEKS DYNAMICS OF HEART RATE VARIABILITY IN CARDIAC RESYNCHRONIZATION THERAPY PATIENTS
Background: Acute changes in HRV after cardiac resynchronization therapy (CRT) have not been well assessed.
Objective: To evaluate dynamics in HRV one and four weeks after CRT.
Methods: This prospective study included eleven HF patients (52,7±7,5 years, New York Heart Association functional class III to IV). The analysis of HRV was performed at rest and active orthostatic test (AOT) in the short period (300 RR-intervals) before (baseline) and after one and four weeks of CRT.
Results: Results are shown in the table 49.1. One week after CRT significantly increased SDNN, TP, VLF and LF components at AOT. Four weeks after CRT we found a tendency to increase the high frequency spectral share (HF%), decrease the very low frequency spectral share (VLF%) at rest; increase SDNN and ÒÐ by increasing the power of all frequency components HRV at AOT.
Conclusion: These study results demonstrate the improvement of HRV parameters at rest and AOT after one and four weeks of CRT.