@jonesc - You might find the following 2020 article helpful as it contains some resource links and other cardiac risk information on Hydroxychloroquine - Dr. Ackerman in National News:
https://connect.mayoclinic.org/blog/genetic-heart-rhythm-disorders/newsfeed-post/dr-ackerman-in-national-news/.
There are also several related discussions where members have shared their experience - https://connect.mayoclinic.org/search/discussions/?search=Hydroxychloroquine%20side%20effects.