Heart Attacks are Preventable!

EP288: Chewing The Fat

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 focused on educating people about cardiovascular health and wellness. In this episode, Dr. Bishop explores the fascinating science of brown fat versus white fat, explaining how understanding these two types of body fat could potentially revolutionize approaches to weight management and metabolic health. Key Takeaways: White fat is the energy storage fat that accumulates around the abdomen when excess calories are consumed and is driven into cells by insulin, but excessive white fat causes inflammation and insulin resistance. Brown fat is metabolically active tissue characteristically found in babies and young mammals, located around the upper chest and back, and serves an important thermoregulation function. Brown fat generates heat through non-shivering thermogenesis, a process where it metabolizes fuel to create warmth without muscle shivering, helping young mammals maintain body temperature. Mitochondrial uncoupling protein 1 (UCP1) is a key protein that allows brown fat to bypass normal ATP energy production and instead generate heat directly. A purine derivative chemical compound naturally blocks UCP1 function, but scientists are exploring ways to inhibit this blocker to enhance brown fat's calorie-burning potential. Brown fat becomes more effective at glucose management, actively drawing glucose from the bloodstream, which could have therapeutic applications for metabolic health. Future therapeutic interventions may target blocking the purine process to activate brown fat for non-shivering thermogenesis, potentially offering a novel weight loss strategy. Cold exposure, including cold showers, cold baths, and wearing light clothing in cold weather, can naturally stimulate brown fat activation and increase metabolism. Cold stress activates cold shock proteins in tissues, triggering increased metabolic activity that could help burn additional calories and support weight management. Read more

EP287: Heart Attack vs. Heart Failure and the Role of AI

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 Dr. Warrick Bishop is a cardiologist, author, and CEO of the Healthy Heart Network based in Hobart, Australia. In this ABC Radio Hobart episode, he discusses the critical differences between heart attack and heart failure, and explores the emerging use of AI diagnostic tools in cardiology. The conversation emphasizes the importance of understanding cardiovascular health to prevent the one heart attack that occurs in Australia every 20 minutes. Key Takeaways: A heart attack occurs when a sudden blockage in a major artery cuts off blood supply to the heart muscle, potentially causing dangerous irregular rhythms and collapse, whereas heart failure is when the heart fails to pump enough blood to adequately supply the body's organs. Heart failure causes fatigue and fluid retention because the body's evolutionary defense mechanisms misinterpret poor heart function as blood loss, triggering the kidneys to retain excess fluid that accumulates in the lungs or legs. Symptoms of heart failure include swollen ankles (typically both legs simultaneously), shortness of breath that worsens with physical activity or lying flat, and difficulty with previously manageable tasks like climbing stairs. Heart failure can develop suddenly with acute shortness of breath requiring emergency care, or develop gradually with symptoms that patients may mistakenly attribute to aging, necessitating GP evaluation and cardiology referral. The heart can fail in two distinct ways: either the squeezing function is impaired or the relaxation function is impaired, requiring proper diagnostic scanning to determine the correct treatment approach. Effective medications exist for treating heart failure, and early identification combined with prompt treatment at optimal doses significantly improves patient outcomes. Approximately 40% of people with dangerous arterial plaques have no symptoms because the blockage doesn't limit blood flow until the plaque ruptures and forms a clot, making many heart attacks seemingly unpredictable. AI diagnostic tools like Clearly are already being used commercially in the US to interpret cardiac scans with high accuracy, potentially saving considerable time compared to manual radiologist review. AI technology could dramatically accelerate the analysis of large volumes of medical scans without fatigue or breaks, offering enormous potential benefits to healthcare efficiency. The AMA's cautious response to AI diagnostic tools reflects the importance of thoroughly understanding how these systems work before widespread clinical adoption, despite their promising capabilities. Read more

EP286: Heart Anatomy and Function

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 to educate listeners about heart health and disease prevention in Australia. In this episode, Dr. Bishop provides a comprehensive overview of heart anatomy and function, returning to basics to explain how this vital organ works to deliver oxygen throughout the body and remove waste products. The podcast aims to help Australians understand that most heart attacks are preventable with proper knowledge of cardiovascular health. Key Takeaways The heart's primary function is to pump oxygen-rich blood to body tissues and return carbon dioxide-depleted blood to the lungs for gas exchange, making it essential for cell survival and metabolism. Blood circulation involves two interconnected pumps: the right heart receives deoxygenated blood from the body via the superior and inferior vena cava and pumps it to the lungs, while the left heart receives oxygenated blood from the lungs and pumps it throughout the body via the aorta. The heart consists of four chambers: two thin-walled atria that receive blood and two thick-walled ventricles that pump blood, with the left ventricle being the most powerful chamber responsible for systemic circulation. Four one-way valves (tricuspid, pulmonary, mitral, and aortic) ensure blood flows in only one direction, preventing backflow and maintaining efficient circulation. The heart's electrical system acts as a timing mechanism, with every heart cell capable of generating its own electrical impulse through ion exchange across cell membranes. The heart's electrical signals originate in the right atrium's specialized cells, which depolarize fastest and coordinate the sequential contraction of the atria and ventricles to efficiently pump blood. Specialized conduction cells act like "copper wires" to distribute electrical signals to the ventricles' furthest regions, ensuring proper squeezing direction that expels blood rather than compressing inward. The heart can be analogized to a car engine, where the electrical system provides timing, the chambers function like pistons, and the valves control directional flow—together creating an exquisitely coordinated pumping system. Read more

EP285: Heart Related Problems and Symptoms

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 is a cardiologist, author, keynote speaker, and CEO of the Healthy Heart Network dedicated to helping people live well for as long as possible. In this episode, he addresses the reality that heart disease is prevalent in Australia, with someone suffering a heart attack every 20 minutes, and explains that most could be prevented with proper knowledge. The podcast focuses on understanding heart-related symptoms by analyzing the heart as an engine with distinct systems: electrical, pistons/valves, and fuel lines. Key Takeaways: The heart functions like a car engine with an electrical system that maintains timing, pistons and valves that create the engine block, and fuel lines that deliver blood to the heart muscle. Palpitations occur when the electrical system malfunctions, causing the heart to race or flutter, and can manifest as extra beats (atrial or ventricular ectopic beats) or more sustained arrhythmias like supraventricular tachycardia or atrial fibrillation. Syncope (blackouts) result from electrical problems, either from complete heart block or from the heart racing so fast that blood flow to the brain is compromised, potentially leading to sudden cardiac death. Problems with the pistons (heart muscle) and valves produce similar general symptoms: shortness of breath, fluid retention in the lungs and ankles/feet, and diminished exercise capacity, requiring an echocardiogram to identify the specific cause. Blocked fuel lines (coronary arteries) cause oxygen deprivation to heart muscle, initially presenting as chest tightness or cramping (angina), and if completely blocked, leading to myocardial infarction and tissue death. Angina can occur suddenly from plaque rupture causing complete blockage, or gradually through exertion-induced symptoms that improve with rest when blood flow is insufficient. Women with coronary artery disease often present with shortness of breath as their primary symptom rather than chest pain, making diagnosis more challenging than in men. Any symptoms suggestive of heart problems—palpitations, blackouts, shortness of breath, fluid retention, or chest pain—warrant immediate medical evaluation rather than delayed appointment scheduling. Read more

EP284: Risk Factors

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 focused on understanding the various risk factors associated with different types of heart disease. Rather than discussing heart disease as a single condition, Dr. Bishop explores how risk factors vary depending on whether the problem involves coronary arteries, heart valves, the electrical system, or the heart muscle itself. The episode aims to educate listeners on preventative measures and early detection strategies. Key Takeaways: Heart disease encompasses multiple types of problems beyond blocked arteries, including electrical issues, valve problems, and muscle dysfunction, each with distinct risk factors. Age is the most significant risk factor for coronary artery disease, as atherosclerotic plaque buildup is largely a response to arterial wear and tear over time. Blood pressure is one of the most important modifiable risk factors, as higher blood pressure accelerates wear and tear within arteries and plaque development. Men face coronary artery disease risk approximately one decade earlier than women, making sex an inherent biological risk factor. Familial hypercholesterolemia, characterized by extremely high cholesterol levels running in families, can lead to premature heart attacks (before age 50 for men, 60 for women). Lifestyle factors including obesity, lack of exercise, diabetes, depression, and low socioeconomic status all significantly increase heart disease risk. Atrial fibrillation risk increases dramatically with age, alcohol consumption, high blood pressure, and obesity, and once developed is difficult to reverse. Congenital valve abnormalities like bicuspid aortic valves can lead to earlier wear and failure, emphasizing the importance of family health history screening. Sudden cardiac death can result from ventricular electrical problems, particularly in hearts damaged by previous heart attacks or those with familial electrical abnormalities. Genetic predisposition plays a crucial role in dilated and hypertrophic cardiomyopathies, making family history assessment essential for early intervention. Read more

EP283: Heart Disease - What is it?

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 focused on understanding heart disease. He aims to help Australians understand the various causes and mechanisms of heart disease, noting that one person suffers a heart attack every 20 minutes in Australia, with many cases potentially preventable through proper knowledge. Key Takeaways: Heart disease most commonly refers to problems with the arteries, where cholesterol builds up in a process called atherosclerosis, which can rupture suddenly and cause a myocardial infarction (heart attack). Atherosclerotic plaques can also gradually narrow arteries, restricting blood flow during exercise and causing the heart muscle to become oxygen-starved, similar to leg cramps during prolonged physical activity. Electrical problems in the heart can cause various conditions including atrial fibrillation (irregular pulse), supraventricular tachycardia (rapid heartbeat), and sudden cardiac death, with symptoms ranging from palpitations to blackouts. The heart's four valves (tricuspid, pulmonary, mitral, and aortic) can malfunction through wear and tear, with the aortic valve becoming narrowed and the mitral valve prone to leaking. Heart muscle itself can be directly affected by infections (myocarditis), inflammation (pericarditis), and bacterial infections on the valves (subacute bacterial endocarditis). Toxins such as alcohol and chemotherapy drugs (particularly anthracyclines) can damage the heart and impair its function. Infiltration of substances into the heart, such as amyloid protein (similar to Alzheimer's pathology) or iron, can disrupt normal heart function by accumulating between cells. Heart disease encompasses multiple pathological mechanisms beyond arterial problems, requiring broad diagnostic thinking when evaluating patients with cardiac issues. Read more

EP282: St Lukes Joins Forces With Healthy Heart Network To Combat Heart Disesase in Tasmania

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 Episode Summary Introduction Dr. Warrick Bishop, a cardiologist, author, and CEO of the Healthy Heart Network based in Hobart, hosts this episode focused on addressing Tasmania's significant heart disease problem. He is joined by Luke Cameron, Chief Health Officer of St Luke's Health, to discuss an exciting new partnership aimed at improving cardiovascular health outcomes in Tasmania. The episode centers on a pilot study using coronary artery calcium scoring via CT scanning as a more precise method for identifying and assessing individual heart disease risk. Key Takeaways: Heart disease is the leading cause of death in Tasmania, accounting for approximately one in eight deaths, with around 38,000 Tasmanians currently living with heart disease. Traditional risk calculators are population-based tools that don't accurately reflect individual risk, whereas CT scanning for coronary artery calcium provides precision medicine by directly visualizing plaque buildup in arteries. The St Luke's Health and Dr. Warrick Bishop partnership will launch a pilot study recruiting 100 participants for virtual heart assessments, with recommendations for coronary artery calcium score CT scans based on results. Calcium scoring identifies calcification in arteries, which appears as bright white spots on CT scans and serves as a surrogate marker for cholesterol deposits and plaque buildup. Medical practitioners have been reluctant to mainstream calcium scoring because double-blind, randomized controlled trials (the gold standard for evidence) are ethically impossible to conduct with this diagnostic tool. Lifestyle modifications like exercise and healthy eating don't necessarily eliminate plaque once it has formed, making direct scanning the most reliable way to assess individual cardiac status rather than guessing based on risk factors. Coronary artery calcium CT scanning costs hundreds of dollars—comparable to a set of tires—and is currently self-funded as there is no Medicare rebate, though it's available through GPs and Dr. Bishop's VirtualHeartCheck.com website. The pilot study has already achieved 20-30% uptake from St Luke's Health members within days of launch, indicating strong community interest in better heart health outcomes. Coronary artery disease kills one in four people, making it responsible for more deaths than all cancers combined, underscoring the critical importance of screening and prevention. Read more

EP281: Drunk Mice and Grafting Hearts

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 Episode Summary Introduction Dr. Warrick Bishop, a cardiologist, author, and CEO of the Healthy Heart Network, hosts this episode focused on cardiovascular health and emerging medical research. The episode covers two fascinating scientific studies: one on a liver hormone that may help treat severe alcohol intoxication, and another on the best graft options for coronary artery bypass surgery. Both topics have practical implications for emergency medicine and cardiac care. Key Takeaways: Fibroblast growth factor 21 (FGF21) is a liver-produced peptide hormone that shows promise in treating severe alcohol intoxication by stimulating the brain to release norepinephrine (adrenaline). In mouse studies, FGF21 injection helped severely intoxicated mice regain balance and alertness nearly twice as fast as untreated mice (1 hour 40 minutes vs. 3 hours 46 minutes). FGF21 works by triggering the body's "fight or flight" response through norepinephrine release, which increases alertness and attention in the brain. The hormone is not a "party drug" and will neither allow intoxicated individuals to drive safely nor prevent hangovers. FGF21 appears to work specifically on alcohol intoxication and showed no effect on other sedatives like diazepam, barbiturates, or ketamine. The left internal mammary artery is the superior graft conduit for coronary artery bypass surgery, with the radial artery from the wrist being the second-best option. A 10-15 year Australian study confirmed current best practices for selecting graft conduits in bypass surgery, providing important guidance for surgical planning discussions. FGF21 also shows potential benefits for treating non-alcoholic fatty liver disease, weight loss, and insulin control beyond its acute intoxication applications. Read more

EP280: Talking Osteoporosis With Doctor Cooley (Rhuematologist) Part 3

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, interviews Dr. Helen Cooley, a rheumatologist from Hobart, in the third episode of a series on osteoporosis. This episode focuses specifically on the medications used to treat osteoporosis, their mechanisms of action, implementation strategies, and how to guide patients through treatment options, using a postmenopausal woman with significant osteoporosis as a case study. Key Takeaways: Treatment decisions for osteoporosis must be patient-centered and fully involve the patient in weighing risks and benefits against their individual circumstances. Bisphosphonates (such as alendronate/Fosamax and risedronate) are long-established oral medications taken weekly that work by slowing bone turnover to prevent bone loss, with compliance being a significant challenge. Intravenous bisphosphonates like zoledronic acid offer convenience as an annual infusion lasting 3-5 years, but can cause significant aches and pains for 24-48 hours after administration. Denosumab (Prolia) is a monoclonal antibody injection given every six months that blocks osteoclast activity, but requires continuity of treatment as rapid bone loss occurs if injections are missed. Anabolic agents like teriparatide and romosozumab actually build new bone rather than just slow loss, but are currently only accessible after fracture and failure of other treatments with very low T-scores. The risk of osteonecrosis of the jaw (a serious dental complication) from bisphosphonates is rare at approximately 1 in 20,000 patients, significantly lower than the 30-40% fracture risk in untreated osteoporotic women. Treatment selection should consider patient preference regarding delivery method (oral tablets, intravenous infusions, or subcutaneous injections) and tolerance for potential side effects. Adequate vitamin D levels and normal kidney function are prerequisites for certain osteoporosis medications, particularly intravenous bisphosphonates. Pre-treatment dental evaluation and completion of necessary invasive dental work before starting bisphosphonates can prevent anxiety and reduce complication risks. Read more

EP279: Talking Osteoporosis With Doctor Cooley (Rhuematologist) Part 2

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 Episode Summary Introduction: Dr. Warrick Bishop, a cardiologist, author, and CEO of the Healthy Heart Network, hosts this episode featuring Dr. Helen Cooley, a Hobart-based rheumatologist. The discussion focuses on managing osteoporosis in patients, particularly perimenopausal and postmenopausal women, with emphasis on lifestyle interventions and diagnostic approaches to determine fracture risk. Key Takeaways: Comprehensive medical history is essential when evaluating patients for osteoporosis, including childhood illnesses, medication use (particularly glucocorticoids, epilepsy treatments, and breast cancer drugs), and previous fractures. Fracture risk assessment tools like the Garvin Risk Calculator (available free online) should be used to guide treatment decisions rather than relying solely on bone density test numbers. Smoking and alcohol consumption significantly impact bone health beyond their other health effects and should be specifically addressed in lifestyle counseling. Weight-bearing exercise such as walking and resistance activities are crucial for building and maintaining bone density, though care must be taken with fall-prone elderly patients. Obtaining calcium from dietary sources (dairy, leafy greens, nuts, and fortified soy products) is preferable to supplements due to conflicting evidence about calcium supplementation increasing heart disease risk. When calcium supplements are necessary, they should be divided across meals with food, and calcium citrate may be better absorbed than calcium carbonate, especially in patients taking proton pump inhibitors. Vitamin D deficiency is common, particularly in winter months in Tasmania, and is important for calcium and phosphate absorption; supplementation may benefit those in nursing homes or with limited sun exposure. Vitamin K2, while theoretically beneficial for bone mineralization, has conflicting evidence for treating osteoporosis and is best obtained through dietary sources like leafy green vegetables rather than supplements. Medication decisions for osteoporosis should be considered when hip fracture risk is around 4% or overall fracture risk reaches 16-20% over 5-10 years. Read more