Techniques for determining reliability of electrocardiogram (ECG) data are disclosed. ECG data, including waveform data for a patient, is received. An amplitude associated with an R-wave in the waveform data is determined. First and second baseline regions in the waveform data, each relating to the R-Wave, are identified. A signal-to-noise ratio (SNR) is determined, based on the amplitude, the first baseline region, and the second baseline region. The SNR facilitates medical treatment for the patient.
