Heart Attacks are Preventable!

EP350: Talking Heart and Aging With Dr Luong Part 1

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 welcomes Dr. Rebecca Long, an accredited practicing dietitian specializing in sports nutrition and cardiometabolic health, and co-founder of Heartful Flavours. The episode explores Rebecca's career journey into dietetics and focuses on dietary strategies for managing cardiometabolic health, particularly through carbohydrate control and whole dietary pattern approaches. Key Takeaways: Rebecca's path to dietetics was driven by a lifelong love of food combined with firsthand observations of the importance of health management during her work as a medical receptionist while studying food science. Cardiometabolic health is a term coined in 1999 that encompasses interconnected risk factors including blood pressure, blood glucose levels, cholesterol, and central adiposity that collectively predict heart disease and diabetes risk. Modern nutrition research emphasizes analyzing complete dietary patterns rather than single nutrients, as the synergistic effects of combined foods and nutrients provide a more accurate understanding of health impacts. For pre-diabetic and high blood sugar patients, carbohydrate control (not elimination) is recommended, with typical targets of 30-45 grams per meal at breakfast, lunch, and dinner, with testing two hours after meals to monitor blood sugar response. Glycemic index distinctions matter: low glycemic index foods like basmati rice raise blood sugar more slowly with lower peaks, providing sustained energy, while high glycemic index foods cause rapid spikes and drops in blood sugar. Whole grains are universally recommended across healthy dietary patterns over refined grains, and processed foods high in sugar should be limited as part of overall cardiometabolic management. The discussion will continue in a follow-up episode focusing on protein and fat intake in the context of frailty and heart health, emphasizing that carbohydrate reduction is one component of a broader healthy dietary pattern approach. Read more

EP349: Climate and Environment with Dr Fiona Foo 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 Summary Introduction Host Warwick Bishop welcomes back Dr. Fiona Fu, a general and interventional cardiologist specializing in women's cardiovascular health, sports cardiology, and the intersection of climate change with cardiovascular disease. This is the second episode in a series exploring environmental factors affecting heart health, building on their previous discussion about air pollution and expanding to cover traffic-related emissions and extreme weather impacts on cardiovascular systems. Key Takeaways: Traffic-related air pollution in Australia contributes to over 11,000 deaths annually and more than 12,000 cardiovascular disease hospitalizations, making it a significant public health crisis. Traffic emissions represent approximately 10% of Australia's total emissions and are the fastest-growing source, requiring urgent mitigation strategies. The "idle-off" initiative encourages drivers to turn off engines when stopped, particularly in school zones where children with developing lungs are most vulnerable to pollution exposure. Active transport options—walking, cycling, and public transportation—reduce both cardiovascular disease risk and emissions while providing incidental health benefits through increased physical activity. Diesel vehicles and larger vehicles produce more toxic emissions and ultrafine particles that penetrate deeper into the lungs than standard PM 2.5 particles. Extreme heat is the leading cause of death from natural disasters in Australia and significantly increases risk of heart attacks, strokes, heart failure, and arrhythmias. Heat and humidity combined create synergistic effects on cardiovascular mortality, with the combined impact greater than each factor independently. Vulnerable populations include elderly and young people, pregnant women, those with chronic diseases, low-income individuals lacking air conditioning, outdoor workers, and athletes, though heat-related illness can affect anyone regardless of age. Proper hydration (at least 2 liters daily, more in heat) and electrolyte replacement are essential for protection against heat-related cardiovascular events, particularly for athletes. Extreme heat combined with bushfires in Australian summers creates compounded cardiovascular health risks through synergistic effects on disease mortality and hospitalizations. Read more

EP348: Climate and Environment with Dr Fiona Foo Part 1

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. Episode Summary Dr. Warwick Bishop hosts Dr. Fiona Foo, a Sydney-based interventional cardiologist with expertise in women's heart disease and sports cardiology, to discuss the critical intersection of climate, environment, and cardiovascular health. In this first part of a two-part series, they explore how environmental factors—particularly air pollution—represent a major modifiable risk factor for heart disease worldwide, one that many people fail to recognize or act upon. Key Takeaways: Environmental factors, including air pollution, are the fourth highest modifiable risk factor for cardiovascular disease globally—ranking higher than smoking—alongside behavioral and metabolic risk factors. Air pollution causes approximately 6.7 to 8 million deaths annually worldwide, with over 50% of these deaths attributed to cardiovascular disease, including heart attacks and strokes. PM2.5 particulate matter (2.5 microns in diameter) from fossil fuel burning, forest fires, and traffic exhaust is so small it can penetrate the lungs, enter the bloodstream, and damage every organ in the body through inflammatory and oxidative pathways. More than 90% of the global population is exposed to annual PM2.5 levels exceeding WHO guidelines, and Australia is not immune despite perceptions otherwise—particularly during bushfire and back-burning seasons. Switching to renewable energy sources (solar, wind) and electrifying home systems previously powered by fossil fuels and gas is one of the most impactful personal actions to reduce air pollution while improving cardiovascular and respiratory health. During high air pollution events (bushfires), individuals should stay indoors, avoid outdoor exercise, use N95 masks if outside, install air filters, seal door gaps, and set car air conditioning to recirculation mode rather than drawing in outside air. Domestic gas stoves and oil/gas production facilities release multiple pollutants (methane, ozone, nitrogen oxide) beyond PM2.5 that significantly increase asthma, respiratory illness, and cardiovascular disease risk, particularly affecting vulnerable populations. Climate change is intensifying both air pollution exposure and extreme weather events (heat and cold), creating compounding cardiovascular and broader health risks that require both individual action and systemic policy changes. Read more

EP347: What Do You Know About Your Appendix?

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. Episode Summary: What Do You Know About Your Appendix? Dr. Warwick Bishop, a physician and podcaster, explores the emerging medical perspective on the appendix in this episode. Drawing from recent medical literature, Bishop challenges the traditional view of the appendix as a useless vestigial organ and discusses new research suggesting it plays important roles in gut health and immune function. The episode examines whether preserving the appendix through antibiotic treatment, rather than surgical removal, might be beneficial for long-term health. Key Takeaways: The appendix may not be useless as previously thought; it could serve as a "safe house" that stores beneficial gut bacteria and helps restore the microbiome after infections like salmonella. Antibiotic therapy is emerging as a viable alternative to appendectomy (surgical removal) for uncomplicated appendicitis, raising questions about whether routine surgical removal is always necessary. People who have undergone appendectomy show more than double the risk of serious non-typhoidal salmonella infections requiring hospitalization, suggesting a protective role of the intact appendix. Removal of the appendix is linked to increased risk of irritable bowel syndrome, type 2 diabetes, lupus, and potentially colorectal cancer and Parkinson's disease. The appendix contains special M cells that detect invasive bacteria and viruses, suggesting it functions as a training ground for the immune system. Comparative anatomy studies show the appendix has undergone at least 29 evolutionary changes across mammalian species, indicating it likely has adaptive functions rather than being merely vestigial. Research on zoo animals demonstrated that species with an appendix lived longer and experienced less diarrhea than those without, supporting a protective health function. Before automatically removing an appendix during treatment with antibiotics, consideration should be given to whether the antibiotics themselves might harm the beneficial bacterial reservoir the appendix maintains. Read more

EP346: Cholesterol and Statin Non-Believers

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. Warwick Bishop, a cardiologist, author, keynote speaker, and CEO of the Healthy Heart Network, hosts this episode to address common misconceptions and skepticism surrounding cholesterol and statin therapy. With heart disease claiming a life every 20 minutes in Australia, Dr. Bishop discusses myths held by "cholesterol and statin non-believers" that could prevent people from receiving beneficial treatment. The episode aims to clarify the science behind cholesterol management and cardiovascular health. Key Takeaways: Cholesterol itself is essential for body functions like vitamin transport, bile acid production, and cell membranes, but becomes problematic when it accumulates in arteries as part of atherosclerosis. While high blood cholesterol levels alone don't perfectly predict who has arterial plaque, for people with identified plaque or previous cardiac events, lowering cholesterol is unquestionably beneficial and well-supported by scientific evidence. Saturated fats increase LDL cholesterol levels, which can be problematic for people with existing arterial plaque; more research is needed on whether dietary approaches like ketogenic diets can offset saturated fat risks through inflammation reduction. Cholesterol is necessary for hormone production, but the body can function adequately with very low blood cholesterol levels since cells synthesize 80% of the cholesterol they need internally rather than relying on dietary sources. LDL particle size is likely an indicator of other metabolic problems like insulin resistance and inflammation rather than the primary driver of atherosclerosis, making the overall metabolic picture more important than particle size alone. Statins cause significant harm only when prescribed to low-risk individuals without evidence of arterial disease; for high-risk patients with documented plaque, the risk-benefit equation strongly favors statin therapy. Statin side effects are likely overreported rather than underreported, with studies showing that 75% of people reporting statin side effects can successfully take the medication when evaluated in double-blind trials, indicating a substantial nocebo effect. For patients with significant coronary artery disease, every millimole reduction in cholesterol produces a 20% relative risk reduction in recurrent cardiac events—a substantial and well-documented benefit. The distinction between how cholesterol enters arterial walls (from inside-out versus outside-in via small blood vessels called the vasa vasorum) doesn't change the clinical reality that lowering cholesterol reduces risk in high-risk patients. Inflammation is important in atherosclerosis development, but it is not the sole explanation; cholesterol plays a healing response role in inflammatory sites, making the process more complex than inflammation alone. Read more

EP345: 5 Highlights From PD 2024

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. EP345: 5 Highlights From PD 2024 Dr. Auric Bishop, a cardiologist and CEO of the Healthy Heart Network, hosts this episode featuring Dr. Warwick Bishop discussing key highlights from the 2024 Port Douglas Heart Meeting and Expo. The episode focuses on five major clinical advances and topics presented on day one of this prestigious international cardiology conference, which brings together leading experts from renowned institutions like the Mayo Clinic to share practical, clinically-guided teaching relevant to everyday cardiology practice. Key Takeaways: Angiovac technology represents an innovative intervention for bacterial endocarditis, functioning like a "vacuum cleaner" that uses ultrasound guidance to remove bacterial vegetations from heart valves, thereby reducing infective load and preventing dangerous complications like stroke or kidney infarction. Current evidence suggests earlier surgical intervention for aortic stenosis and mitral regurgitation may be beneficial, as delaying surgery while the heart remains under strain can lead to irreversible fibrosis and scarring of the ventricle, compromising surgical outcomes even after valve replacement. High-risk pregnancy categories for cardiac patients include women with elevated pulmonary pressures, reduced left ventricular function, severe valve disease, severe aortic dilatation (associated with Marfan syndrome and Ehlers-Danlos syndrome), and peripartum cardiomyopathy, which requires pre-pregnancy risk assessment and counseling. The athlete's heart exhibits training-specific adaptations: endurance athletes develop enlarged hearts with greater stroke volume, while strength-trained athletes develop thickened, more powerful hearts, both representing normal responses to elite-level training stimuli. Strain technology, specifically longitudinal strain measurement, provides a sophisticated way to assess myocardial damage and guide optimal timing for mitral valve surgery before irreversible cardiac damage occurs. Percutaneous mitral valve correction using clips inserted through blood vessels offers a less invasive surgical alternative to traditional open-heart surgery for patients with inadequate mitral valve closure. Read more

EP344: Climate Change and CVD and PFO at PD 2024

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: Climate Change and CVD and PFO at PD 2024 Introduction Dr. Auric Bishop, a cardiologist and CEO of the Healthy Heart Network, hosts this episode with guest Warwick Bishop, who follows up on presentations from the Port Douglas medical conference. The episode focuses on two major topics: the cardiovascular impacts of climate change highlighted by renowned Mayo Clinic cardiologist Bernard Gersh, and patent foramen ovale (PFO) closure procedures, with Warwick sharing his personal experience of having a stroke caused by an undiagnosed PFO. Key Takeaways: Climate change and environmental deterioration significantly impact cardiovascular health through increased inflammation and hypercoagulability, which accelerate atherosclerosis progression and increase heart attack and sudden death risk. Heat stress and temperature extremes negatively affect thermoregulation, particularly impacting patients with cardiac failure who experience worsening symptoms like swollen ankles and shortness of breath in hot conditions. Electrolyte imbalances from excessive sweating, increased respiration, and fluid loss during heat exposure can trigger dangerous cardiovascular complications. Micro-nanoplastics from air pollution accumulate in arterial plaques and are closely linked to worsening cardiovascular outcomes; these microplastics are now being found in human bodies and plaque development. Community-based secondhand smoke regulations in Pueblo, Colorado achieved a remarkable 30-40% reduction in heart attack risk, demonstrating how public health initiatives can dramatically reduce cardiovascular disease in populations. Noise pollution from increased urbanization, transport, and air traffic directly correlates with elevated blood pressure, a critical driver of heart attacks, strokes, atrial fibrillation, cardiac failure, renal failure, and dementia. Patent foramen ovale (PFO) occurs in approximately 25% of the population when a fetal heart opening fails to close properly after birth, potentially allowing blood clots to bypass the lungs' filtering action and cause strokes. PFO poses particular danger for divers (risk of decompression sickness) and anyone with venous blood clots, as these can cross through the opening into the arterial circulation and lodge in the brain or other organs. PFO closure is a minimally invasive, low-risk procedure performed via catheter through a leg vein, using umbrella-like devices to secure and close the opening, with high success rates despite a slightly increased risk of developing atrial fibrillation. Read more

EP343: Triglycerides and Heart DIsease (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. Auric Bishop (also known as Warwick Bishop), a cardiologist, author, and CEO of the Healthy Heart Network, hosts this episode focused on managing elevated triglycerides. The episode is part two of a triglyceride series, diving into both lifestyle interventions and medical approaches to lowering triglycerides, which affect millions of Australians and contribute to preventable heart disease. Key Takeaways: Elevated triglycerides are markers of underlying metabolic dysfunction including insulin resistance, central weight gain, visceral fat, inflammation, and high blood pressure—creating a "nasty pack" of cardiovascular risk factors. Lifestyle management of triglycerides should be the first step and includes reducing saturated fats and refined sugars in the diet, since both can be converted to fatty acids and triglycerides. Exercise lowers triglycerides through two mechanisms: by improving insulin resistance and directly using triglycerides as fuel when energy expenditure increases. Alcohol significantly elevates triglycerides through enzymatic pathways that convert it to acetyl-CoA, a building block for fatty acid production, making alcohol reduction critical. The landmark GISSI-P trial demonstrated that one gram of fish oil daily reduced sudden cardiac death by 45% and overall mortality by 20% in post-heart attack patients, suggesting marine omega-3s are most beneficial for secondary prevention. Subsequent large trials (VITAL, ASCEND, ORIGIN) showed limited benefit of fish oil supplementation in primary prevention populations without prior cardiac events, indicating timing and patient selection are crucial. The REDUCE-IT trial demonstrated that icosapent ethyl (a pure EPA supplement) reduced major adverse cardiac events by approximately 20% in high-risk patients on statin therapy, suggesting the benefit may relate to anti-inflammatory effects rather than triglyceride reduction alone. The Physician's Health Study found that individuals in the highest quartile of omega-3 blood levels had a 90% relative risk reduction in cardiovascular events, with omega-3 index being a stronger predictor of sudden cardiac death than cholesterol or inflammation levels. EPA appears particularly cardioprotective, while DHA is more important for fetal brain and eye development, suggesting different roles for the two marine omega-3 fatty acids. Read more

EP342: Triglycerides and Heart Disease (Part 1)

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. Episode Summary: Triglycerides and Heart Disease (Part 1) Dr. Auric Bishop, a cardiologist and CEO of the Healthy Heart Network, hosts this episode with Warwick Bishop to explore triglycerides—fats that travel in the blood and are significantly associated with heart disease risk. The episode aims to help listeners understand what triglycerides are, why they matter for cardiovascular health, and how they relate to the broader metabolic factors that increase heart disease risk in Australia, where someone suffers a heart attack every 20 minutes. Key Takeaways: Triglycerides are three fatty acids bound to a glycerol backbone and serve as the body's primary energy storage unit, sourced mainly from dietary fats, oils, and processed foods. High triglyceride levels are associated with lower HDL (good cholesterol), increased small dense LDL particles (bad cholesterol), and significantly increased cardiovascular disease risk. Elevated triglycerides are linked to central adiposity (belly fat) and visceral fat around organs, which also correlates with high blood pressure, pre-diabetes, diabetes, and increased blood clotting risk. Both carbohydrate and alcohol consumption increase triglyceride production through similar metabolic pathways—both convert to acetyl-CoA, which the body uses to synthesize fatty acids and triglycerides. Regular physical exercise of at least 150 minutes per week is highly effective at lowering triglycerides because exercise depletes the body's energy reserves and improves insulin sensitivity. Insulin resistance creates a "gang of usual suspects" that includes elevated triglycerides, low HDL cholesterol, and small dense LDL particles, all closely linked to excess weight and obesity. Triglycerides themselves do not directly deposit into atherosclerotic plaques; instead, they serve as a marker of poor metabolic health and underlying processes that drive cardiovascular disease. The relationship between triglycerides and heart disease is complex and involves multiple interconnected factors including inflammation, blood pressure, metabolic function, and cholesterol particle composition rather than triglycerides acting alone. Read more

EP341: The Art 2 Aging - A Healthy Heart Even In Your 90s...

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. Warwick Bishop is a preventative cardiologist, bestselling author, and CEO of the Healthy Heart Network who advocates for proactive heart health management rather than treating disease after it occurs. Host Chris Henry interviews Dr. Bishop about cardiovascular prevention, emphasizing that heart disease affects Australians significantly—with someone suffering a heart attack every 20 minutes—yet most cases could be prevented with proper knowledge and early intervention. The episode explores how people of all ages, particularly those over 65, can minimize or avoid heart problems through lifestyle changes and appropriate medical monitoring. Key Takeaways: Preventative cardiology focuses on identifying risk factors early and delaying or preventing heart problems before they occur, rather than waiting to treat disease after symptoms appear. Aging alone doesn't necessarily guarantee heart deterioration; while wear and tear is natural, individuals can significantly minimize the impact of aging on cardiovascular health through proactive measures. Atrial fibrillation is a "final common pathway" for multiple heart insults including high blood pressure, obesity, poor sleep, and alcohol consumption; it can be managed but not cured with current medical knowledge. An ECG alone is insufficient for comprehensive heart assessment; imaging tests like echocardiograms and coronary artery calcium CT scans are essential to evaluate heart structure, function, and arterial narrowing that may show no symptoms. The coronary arteries ("fuel lines") must be directly imaged to detect narrowing and assess future risk, as external characteristics cannot reliably predict coronary artery disease. A Mediterranean diet with balanced vegetables, protein, fish, nuts, and olive oil provides the strongest evidence-based approach to preventing obesity, high cholesterol, and plaque buildup. Early weight management is critical; losing 1-3 kilos when weight gain first appears is vastly easier than losing 20-30 kilos later, with carbohydrate reduction being the first recommended strategy for weight around the middle. High blood pressure is a major driver of heart problems and should be actively managed, as it significantly contributes to conditions like atrial fibrillation and arterial damage. Lifestyle factors including stress management, adequate sleep, limiting alcohol consumption, and avoiding excess carbohydrates are foundational to long-term cardiovascular health. Early intervention and recognition of negative health trends allows people to implement corrective strategies sooner, resulting in better long-term outcomes than waiting until disease develops. Read more