This document discusses heart disease and provides information from Dr. V.P. Nair, a cardiologist. Some key points: - Globally, heart disease causes 17.5 million deaths annually. In Singapore in 2009, heart disease caused 23.6% of deaths, or 3933 deaths. - The heart works hard, beating over 100,000 times per day and pumping 10 metric tons of blood. Its energy comes mainly from fats and carbohydrates. - Angina is temporary chest pain or discomfort that occurs during physical exertion. A heart attack is usually caused by a blood clot blocking a coronary artery and treatment is most effective within 1 hour of symptoms starting. -