Best Cardiologist Bangalore A heart attack happens when the flow of blood that carries oxygen to the heart is suddenly cut off and the patient experiences excruciating chest pain. However sometimes people having a heart attack experience no symptoms at all. The clinical term for this is "silent" heart attack. If you think you or anyone known to you is experiencing signs of a heart attack, make an appointment immediately with Dr. Kumar Kenchappa , Consultant Interventional Cardiologist at SPARSH Hospitals.