Utility and accuracy of a smartphone-based electrocardiogram device as compared to a standard base-apex electrocardiogram in the horse.

•Smartphone-based ECG device acquires high quality ECGs in horses•Device allows evaluation of cardiac arrhythmias inexpensively•Smartphone-derived heart rate highly agrees with reference ECGs•Smartphone-derived heart rhythm highly agrees with reference ECGs•Smartphone-derived QRS polarity highly agrees with reference ECGs•Small bipole distance between electrodes may result in small P waves•Small waveforms (Ps) may be missed on smartphone ECGs