Additional file 1: of Can heart rate variability parameters derived by a heart rate monitor differentiate between atrial fibrillation and sinus rhythm?

Receiver Operating Curve (ROC) for the use of RMSSD to distinguish atrial fibrillation from sinus rhythm in 14 warmblood horses during a 2-min heart rate recording at rest, (A), walk (B) and trot (C). ECGman: RR intervals obtained from a surface ECG after manual correction of QRS detection, using a commercial ECG software program (Televet 100 software version 5.1.2, Engel Engineering Services GmbH, Heusenstamm, Germany) to calculate RMSSD within a commercial software program (Kubios Heart Rate Variability Analysis Software, Varsitie 22, 70,150 Kuopio, Finland). ECGaut: RR intervals after automatic analysis of the surface ECG by a commercial ECG software program (Televet 100) to calculate RMSSD within a commercial software program (Kubios Heart Rate Variability Analysis Software). Five different levels of artifact correction were applied for ECGaut, going from a very low to a very high level of filtering. HRM: RR intervals obtained from a heart rate monitor (Polar heart rate sensor H7, Polar Electro Benelux, Dendermonde, Belgium) using commercial plastic electrodes (Polar equine heart rate electrode set, Polar Electro Benelux, Dendermonde, Belgium) to calculate RMSSD within the manufacturer’s software program (Polar Flow Software, Polar Electro Benelux, Dendermonde, Belgium). (TIF 636 kb)