Perhaps, a research should be made on how chloroquine acts on sars-cov2 to validate its' use..
As for the ventricular arryhtmias, long QT is a known side effect of the drug so a daily routine ECG is being done to evaluate it to be stopped.

I guess the issue here is... can it be a treatment, considering its' serious side-effects? Some patients are sensitive to it so it can be discontinued. Some patients have had no side-effects to it too.