EP291: Cardiac Testing Explained - How Doctors Assess The Heart

Welcome to my podcast. I am Doctor Warrick Bishop, and I want to help you to live as well as possible for as long as possible. I’m a practising cardiologist, best-selling author, keynote speaker, and the creator of The Healthy Heart Network. I have over 20 years as a specialist cardiologist and a private practice of over 10,000 patients. Podcast Summary Introduction Dr. Warrick Bishop, a cardiologist, author, and CEO of the Healthy Heart Network, hosts this episode focusing on diagnostic testing used in cardiology. The episode aims to help listeners understand the various tests cardiologists use to evaluate heart health, ranging from simple physical examinations to advanced imaging technologies. Dr. Bishop emphasizes that most heart attacks in Australia could be prevented with proper knowledge and early detection. Key Takeaways: Basic cardiac assessment begins with simple tools: physical examination (checking pulse and blood pressure), auscultation (listening to the heart for valve and fluid issues), and chest X-rays to evaluate heart size and lung fluid. An electrocardiograph (ECG) provides an electrical representation of heart function, and Holter monitors extend this monitoring over 24 hours to capture irregular heartbeats. Echocardiography is the "workhorse" of cardiac testing, using ultrasound to provide detailed structural and functional information about the heart's pumping chambers and valve operation. Risk assessment involves measuring cholesterol levels, blood pressure (including 24-hour monitoring), fasting blood sugar for diabetes detection, and cardiac CT imaging to directly visualize coronary arteries. Stress testing evaluates symptoms by monitoring how the heart responds to exercise, detecting ECG changes that indicate insufficient blood flow to heart tissue caused by blocked arteries. Stress testing can be combined with echocardiography or perfusion/nuclear medicine scans to visualize heart function and blood flow distribution across different regions. Pharmacological stress testing using drug infusions can simulate exercise effects for patients unable to use a treadmill due to conditions like arthritis. Blood tests measuring brain natriuretic peptides (BNP) and atrial natriuretic peptides help determine if shortness of breath is heart-related or lung-related. Cardiac magnetic resonance imaging (CMR) provides exquisite, highly sensitive diagnostic information, though it is time-consuming with limited Medicare rebates in Australia. Heart biopsy, performed through the jugular vein, is reserved as a last-resort diagnostic tool for evaluating specific heart conditions.