Adderall is an amphetamine with high potential for abuse, controlled substance, may lead to drug dependence, may exacerbate behavior disturbances and thought disorders, and psychotic episodes. It is true with misuse or abuse may cause heart problems such as heart palpitations, arrhythmia, and even cardiac arrest. Most at risk are individuals that have a preexisting heart condition that the one wasnt aware.
Hope this provides a perspective, it is not definitive but a very good question. Take care, and I wish you well goin forward.
Ken