Is cytotec safe for heart patients with arrhythmia requiring aspirin therapy ?

Cytotec is a relatively safe drug (no cardiac concerns). The only big precaution is that it should not be used by pregnant women. You can find out information about it here - https://www.drugs.com/pro/cytotec.html

Not aware of the need for aspirin for the treatment of an arrhythmia . Were you told what the indication for aspirin was? Please discuss with your doctor.