Due to your difficulties, there was an indication for implanting cardiac resynchronization therapy (CRT).
Here you can read all about cardiac resynchronization therapy (CRT).
Instructions and the implantation procedure is the same as the implantation of the permanent cardiac pacemaker (see: Instructions for patients when implanting permanent pacemaker)
Here you can download and complete the consent forms for cardiac resynchronization therapy
An important difference in the implantation of CRT is the implantation of a third electrode, which can extend the duration of the procedure due to its complexity.
The procedure can last 1-4 hours.
If you have questions about your CRT, you can always contact your doctor or nurse.