Coronary heart disease affects 12 million Americans. Though it is one of the most serious diseases in the nation, there are many ways to understand and treat it. Author Barry Cohen, M.D., a cardiologist who has treated thousands of patients, addresses all of the most pressing questions, including: What causes coronary heart disease? How does cholesterol affect your heart? What medical tests will you need? What are the newest diagnostic tests available? What medications are prescribed? What is involved with an angioplasty and bypass surgery? What lifestyles changes will improve your health? What are the warning signs of a heart attack? Stay healthier by becoming an informed patient.