BioTekna PPG Stress Flow - Measure HRV & ANSAnalysis, monitoring and biofeedback of the autonomic nervous system and the heart rate variability INFORMATION Using multi channel measurement plethysmograph technology applied to the distal ends of the limbs, the PPG Stress Flow medical device analysis the overall activity of the autonomic nervous system and heart rate variability. The examination takes a few minutes and allows the study and direct monitoring of all functions of the autonomic