thanks! I have 2 other ECG videos which you may also find useful on my channel (ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-55JGS96YZps.html - ECG basics / ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-XrqAGYlr_TE.html - common ECG abnormalities)