Hi Junaid,
I don't have the Avensys material but I am about to have a new text book I have written specifically for new bio-meds published. One of the many subjects it covers is cardiology and ECG. The book is due for publication at the end of April but it is hoped that the electronic copy will be available at the end of March.
If you wish to see its contents then please follow the link below. Please select 'Forthcoming Titles' and enter my name David Mulvey in the search bar. The book is also available from Amazon and Google. Published by Routledge
https://www.routledge.com/Essential...t-Principles/Mulvey/p/book/9781041003564I hope this may be of interest
Kind regards
David M