Dear Editor-in-Chief: During the last decade, the term "Acute risk factors" was used commonly to describe some activities and events which increase the risk of acute cardiac diseases (1) include: meteorological stress (2, 3), emotional stress (1, 3), overeating (1, 3), nicotine abuse (2), different tensity of physical activity (3), especially heavy physical activity (1, 3), sexual activity (1, 3), during sleep (2), cold or heat exposure (1), coffee or alcohol consumption (1), and cocaine or marijuana use (1). There are some studies which have directly or indirectly studied cardiac risk factors according to gender (4-6), blood group (7) and even among unhealthy people such as patients with metabolic syndrome (8, 9).