Type A aortic dissection is a catastrophic clinical entity involving the ascending aorta. In this case report, a patient was admitted to the emergency room with a presentation resembling acute myocardial infarction (AMI) that led to the inappropriate administration of anticoagulant agents or platelet. This is a case report of a 69-year-old male patient with early misdiagnosis and analysis of type A aortic dissection with discussion on the causes of misdiagnosis in light of the literature.