ABC | Volume 113, Nº5, November 2019

Guidelines Guideline of the Brazilian Society of Cardiology on Telemedicine in Cardiology – 2019 Arq Bras Cardiol. 2019; 113(5):1006-1056 Grades of recommendation and levels of evidence in this update were applied according to the following standards: Classes (grades) of recommendation Grade I Conditions for which there is conclusive evidence or, in the absence of conclusive evidence, a general consensus that the procedure is safe and useful/ effective. Grade IIa Conditions for which there is conflicting evidence and/or divergent opinions regarding the procedure’s safety and usefulness/effectiveness. Weight or evidence/opinion in favor of the procedure. Received approval by most studies/experts. Grade IIb Conditions for which there is conflicting evidence and/or divergent opinions regarding the procedure’s safety and usefulness/effectiveness. Safety and usefulness/effectiveness are less well established, with no prevailing opinions in favor. Grade III Conditions for which there is evidence and/or consensus that the procedure is not useful/effective and in some cases may be potentially harmful. Levels of evidence Level A Data obtained from multiple, concordant, large randomized trials, and/or robust meta-analysis of randomized clinical trials. Level B Data obtained from less robust meta-analysis, from a single randomized trial, or from nonrandomized (observational) trials. Level C Data obtained through a consensus of expert opinions. 1008