Use of hydroxychloroquine and azithromycin combination to treat the COVID-19 infection

Table 2 Tisdale assessment risk score for drug-associated QTc prolongation. A Tisdale score of < 6 predicts low risk, 7-10 medium risk, and > 11 high risk of drug-associated QT prolongation [Adapted from reference 30]

Risk factors	Points
Age ≥ 68 yrs	1
Female sex	1
Loop diuretic	1
Serum potassium (K+) ≤ 3.5 MEq/L	2
Admission QTc ≥ 450 ms	2
Acute MI (myocardial infarction)	2
≥ 2 QTc prolonging drugs	3