Reduced heart-rate variability in brain-dead patients as compared to comatose patients with and without brain stem lesions and healthy volunteers

Imre Bondar, André Stegemann & Raimund Firsching
Objective: Heart rate variability (HRV) is defined as variation of the beat-to-beat R-R time interval between consecutive heart beats in the electrocardiogram (ECG). HRV reflects autonomic control of the cardio-vascular system, which may be impaired in patients with lesions of brain stem areas associated[for full text, please go to the a.m. URL]