The worker suffered a minor head injury at work when struck by a falling wire holder.
A few hours later, he collapsed from a ventricular fibrillation (VF) cardiac arrest.
The worker sought initial entitlement for the cardiac impairment, arguing the head injury was a significant contributing factor.
The Appeals Resolution Officer denied the appeal, finding the head injury was minor and did not cause direct chest trauma or irregular cardiac rhythm as required by WSIB Operational Policy 15-03-10.
The evidence indicated the VF arrest was more likely related to the worker's pre-existing congenital heart defect rather than the workplace accident.