DOUG FARMER, SENIOR EDITOR [email protected]An optical mapping system has demonstrated that hydroxychloroquine (HCQ) can cause arrhythmia in animals, so researchers and clinicians are cautious about its effectiveness as a treatment of COVID-19 in people. Previously, HCQ, a less toxic form of chloroquine (CQ), has been prescribed to those with malaria and various autoimmune conditions and has showed some promise in reducing COVID-19 symptoms in a limited number of cases. Images show the voltage surface on a rabbit heart with and without HCQ. 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