Letters to the Editor: The possibility of using spectral indices of heart rate variability to improve the diagnostic value of cardiovascular autonomic function tests in rheumatoid arthritis patients

Kiselev, Anton R. Saratov State Medical University - Research Institute of Cardiology, Russia , Kiselev, Anton R. Bakulev Scientific Center for Cardiovascular Surgery, Russia , Karavaev, Anatoly S. Saratov State University - Department of Nano- and Biomedical Technologies, Russia , Mironov, Sergey A. Central Clinical Military Hospital - Department of Cardiology, Russia , Prokhorov, Mikhail D. Institute of Radio Engineering and Electronics, Saratov Branch - Laboratory of Nonlinear Dynamics Modelling, Russia

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