In one of (I think Raoult's) studies, there were a few readings of slight prolongation, but nothing came of it, no cardiac deaths. I can send data to date on QT prolongation if I can find it in my notes.
(I had 1000's of links on my Twitter account,and both the account and every bit archive disappeared Sat. July 11 without notification, without cause and without a trace.)
Dr Raoult’s HCQ study was done without zinc. However, the diet in the area where he did his research includes seafood which is rich in zinc. After he has spoken with Dr. Z, it is reported that Dr. Raoult has added zinc to his treatment with HCQ. See my Comment #49 regarding HCQ toxicity.