The following video depicts the cleaning of an MIT Arrhythmia Case 234 for the purpose of HRV analysis. Click on the image to view the video.

Moody GB, Mark RG. The impact of the MIT-BIH Arrhythmia Database. IEEE Eng in Med and Biol 20(3):45-50 (May-June 2001). (PMID: 11446209)