Heart Attacks are Preventable!

EP301: Discussing Bad cholesterol and CAD Dr Kostner and Dr Sangster

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 Dr. Warrick Bishop, a cardiologist and CEO of the Healthy Heart Network, hosts this episode featuring Dr. Karam Kostner (joining from Austria) and Dr. Tony Sangster (from Adelaide). The discussion focuses on the complex relationship between LDL cholesterol and coronary artery disease, exploring why cholesterol levels alone don't accurately predict heart disease risk and examining the nuances of different cholesterol particle types. Key Takeaways: High LDL cholesterol is recognized by cardiologists as a main driver of coronary plaque formation, though not everyone with high LDL develops coronary artery disease. Not all LDL cholesterol particles are equal; Ronald Krauss's research identified different particle sizes (large fluffy "A pattern" versus small dense "B pattern"), with small dense particles showing much greater correlation with heart disease. Cholesterol levels alone are poor predictors of who will develop heart disease—people with high cholesterol can have healthy arteries and vice versa, making prediction challenging without additional assessment. For people with established coronary disease (previous heart attacks, strokes, or bypass surgery), over 25 years of robust research confirms that lowering cholesterol significantly reduces future cardiac risk. Imaging the arteries (coronary calcium scores or carotid artery imaging) provides better individual assessment of cholesterol's actual impact on arterial health than blood tests alone. The triglyceride-to-HDL ratio is a useful marker: ratios below 1.5 indicate predominantly favorable large LDL particles, while elevated triglycerides correlate with problematic small dense particles. Even large, favorable LDL particles can contribute to plaque formation if present in excessive quantities, as particle size difference alone doesn't completely eliminate risk. High triglycerides in diabetic patients increase risk of microvascular complications affecting small blood vessels in organs like the eyes, kidneys, and extremities. Low-carbohydrate diets may naturally reduce triglyceride levels and improve the LDL particle profile, offering a potential dietary approach to managing these risk factors. Read more

EP300: Dangers of Obstructive Sleep Apnoea

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. Rick Bishop, a cardiologist, author, and CEO of the Healthy Heart Network, hosts this episode dedicated to obstructive sleep apnea (OSA) at the request of a listener. The episode explores this common condition affecting approximately 20 million adults in the United States, explaining its causes, symptoms, diagnosis, and treatment options to help listeners understand and address this potentially serious health issue. Key Takeaways: Obstructive sleep apnea occurs when throat muscles relax during sleep, causing partial or complete airway blockage, and affects tens to hundreds of thousands of Australians. Major risk factors include obesity, age, family history, and male sex, though postmenopausal women experience increased incidence as they age. Common symptoms include loud snoring, choking, gasping, and most significantly, excessive daytime sleepiness, which poses serious safety risks for activities like driving. A polysomnograph sleep test is the gold standard for diagnosis, measuring heart rate, respiratory rate, and oxygen saturation to classify severity as mild (5-15 apneic episodes), moderate (15-30), or severe (>30 per night). Untreated obstructive sleep apnea significantly increases risks of high blood pressure, heart disease, stroke, type 2 diabetes, and increases cardiovascular death risk by five times. Initial treatment focuses on lifestyle modifications including weight loss, sleeping on your side rather than your back, and avoiding alcohol before bedtime. CPAP (Continuous Positive Airway Pressure) therapy is the primary treatment, capable of reducing daytime sleepiness by up to 70% when used consistently. Proper machine fit and comfort are critical for long-term CPAP compliance, as poorly fitting devices lead to abandonment of therapy. Anyone experiencing symptoms or whose partner reports breathing pauses during sleep should seek evaluation, particularly if experiencing daytime somnolence and concentration difficulties. Read more

EP299: CSANZ 23 - Athletes and SCA

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 help people understand cardiovascular health and disease prevention. In this episode, Dr. Bishop synthesizes presentations from the 2023 Cardiac Society conference in Adelaide, covering sports cardiology and arrhythmia management, featuring insights from leading cardiologists including Adrian Elliott, André Laguerche, Chris Samsarian, and Liz Peretz. Key Takeaways: Endurance athletes, particularly men, face an increased risk of atrial fibrillation despite being highly fit, likely due to structural remodeling of the atria and changes in vagal tone from intense training. Athletes with atrial fibrillation respond well to pulmonary vein ablation, the same treatment used for non-athletic populations, though the increased stroke risk in athletes remains theoretically concerning despite lack of supporting studies. Endurance athletes show increased coronary artery calcium scores, which may result from wear and tear on arterial walls rather than dangerous plaque development, and the calcified plaques formed are typically more stable and less likely to cause heart attacks. Genetic testing is crucial for identifying cardiac disease in athletes, covering conditions like cardiomyopathy, arrhythmias, metabolic disorders, and congenital issues, but must follow key principles: establishing correct clinical phenotype, providing pre-test genetic counseling, and involving genetic cardiology experts. Sudden cardiac death in young people (under 35 years) is most commonly caused by coronary artery disease, not coronary artery anomalies as previously believed, challenging historical assumptions based on newer autopsy data. Drug toxicity is the second leading cause of sudden cardiac death in young people, highlighting the critical importance of improving society's use and understanding of drugs. Familial hypercholesterolemia is a significant risk factor for sudden cardiac death in young people and requires aggressive identification through family tracing, genetic testing, and early therapeutic intervention. Read more

EP298: Blue Light Glasses and Smells to Remember

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 podcast dedicated to helping people understand cardiovascular health and live as well as possible for as long as possible. In this episode, Dr. Bishop reviews recent medical research from Medscape, discussing two emerging health topics: the efficacy of blue light blocking glasses and the cognitive benefits of inhaling pleasant scents during sleep. Key Takeaways: Blue light blocking glasses likely do not reduce eye strain or improve sleep quality, according to a systematic review of 17 clinical trials involving 619 people published in the Cochrane Database of Systematic Reviews. Computer screens and artificial light sources expose people to only about one-thousandth of the blue light received from natural daylight, making the concern about screen-based blue light exposure significantly overstated. Blue light filtering glasses typically block only 10-25% of blue light, which combined with the minimal exposure from screens, provides minimal benefit to users. Simple lifestyle modifications like reducing screen time, taking regular breaks, and avoiding screens several hours before bedtime are more effective strategies for managing eye strain and improving sleep quality. Inhaling pleasant essential oil aromas during sleep showed a remarkable 226% improvement in memory in cognitively normal older adults over six months compared to a control group. The olfactory (smell) nerve provides a direct "superhighway" connection into the brain's memory centers, making smell the only sense with direct access to these critical cognitive areas. A study using rose, orange, eucalyptus, lemon, peppermint, rosemary, and lavender scents delivered nightly via diffuser showed improved brain functioning in the left uncinate fasciculus, a memory-linked brain region that typically declines with age. While the aroma research is promising and preliminary, more studies are needed to confirm and understand the mechanisms behind the cognitive benefits of olfactory enrichment. Read more

EP297: Treating Kids Cholesterol and Testosterone Therapy

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 podcast dedicated to helping people understand cardiovascular health factors like blood pressure, weight, and cholesterol. In this episode, Dr. Bishop discusses two important medical stories: evolving guidelines on cholesterol screening in young people and recent findings on testosterone replacement therapy safety in older men. Key Takeaways: The US Preventative Services Task Force recently recommended against lipid disorder screening in children and people under 20 years old, contrasting with Australian practices that support early intervention in familial hypercholesterolemia cases. Familial hypercholesterolemia is a genetic condition where individuals inherit elevated cholesterol levels; heterozygous males may experience heart attacks as early as 40-50 years old, while homozygous individuals face even earlier cardiac events. Genetic testing in Australia now allows identification of the specific genetic defect in an index case, followed by cascade testing through the family to accurately identify who carries the condition. Early lipid-lowering therapy starting at ages 7-8 years old in genetically confirmed familial hypercholesterolemia cases aims to reduce arterial plaque buildup and extend lifespan. The TRAVERSE study of 5,000 men aged 45-80 found that testosterone replacement therapy showed no increased risk of heart attack, stroke, or prostate cancer over a 33-month follow-up period. Testosterone therapy did show small but statistically significant increases in atrial fibrillation (5.2% vs 3.3%), acute kidney injury (3.5% vs 2.4%), and pulmonary embolism risk. Unexpectedly, testosterone treatment was associated with increased fracture risk, which may be explained by improved quality of life and increased activity levels rather than a direct harmful effect. Testosterone replacement improved sexual function and sense of well-being in treated men, providing benefits that may outweigh the small identified risks for appropriate candidates. Read more

EP296: Ingredients to Happiness & Screening Cancers

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 discusses two major topics: insights from the Harvard Study of Adult Development on happiness and recent research into blood-based biomarkers for detecting colorectal cancer early. The podcast aims to educate listeners about health priorities and emerging medical technologies that could improve disease prevention. Key Takeaways: The Harvard Study of Adult Development, running since 1938 with nearly 100 years of data across three generations, identifies the two strongest predictors of happiness: taking care of one's health and building loving relationships with others. Quality relationships are the single best indicator of good long-term health outcomes, surpassing professional success as a determinant of wellbeing. Professional success and career achievement provide gratification but do not guarantee happiness, unlike strong personal relationships. Loneliness poses significant health risks, making it important to actively foster relationships through community engagement, sports, hobbies, and volunteer work. Happiness is not constant but fluctuates naturally, contrary to social media portrayals of worry-free existences; resilience is built through both social skills and meaningful relationships. Blood-based biomarkers using DNA and messenger RNA fragments show promising potential for early cancer detection through simple blood tests, potentially eliminating the need for invasive procedures like colonoscopies. Current blood tests for colorectal cancer are not yet widely recommended in Australia, but this technology will likely expand across multiple cancer types in the near future. Socioeconomic advantages, including better healthcare access and healthier habits, contribute to improved health outcomes alongside strong relationships and personal health management. Read more

EP295: Bitter Sweets

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 raising awareness about health risks that could be prevented with proper knowledge. In this "bittersweet" episode, he discusses two concerning scientific findings related to commonly consumed products that may pose hidden health dangers to consumers and their families. Key Takeaways: Dark chocolate products contain potentially harmful levels of lead and cadmium, with Consumer Reports finding that 23 out of 28 dark chocolate bars tested included dangerous heavy metal levels for people consuming more than one ounce daily. Long-term exposure to lead and cadmium can cause nervous system problems, immune system suppression, kidney damage, and pose particular risks to pregnant women and young children due to developmental concerns. Multiple chocolate manufacturers including Hershey, Mondelez, Theo, and Trader Joe's have been sued since Consumer Reports released its heavy metals findings in dark chocolate products. Aspartame, a common artificial sweetener found in diet drinks and foods, may raise anxiety risk at doses below FDA-recommended maximum daily intake levels, according to recent preclinical research. When consumed, aspartame breaks down into aspartic acid, phenylalanine, and methanol, which can have potent effects on the central nervous system and alter gene expression in the amygdala, the brain region regulating anxiety and fear. Aspartame exposure showed multi-generational effects in research, with anxiety-like behaviors and amygdala gene changes appearing in offspring up to two generations removed from exposed individuals, suggesting potential impacts beyond the direct consumer. The anxiety symptoms induced by aspartame in test subjects responded to diazepam (an anti-anxiety medication), confirming the neurobiological nature of the sweetener's effects. Human populations at risk from aspartame's mental health effects may be significantly larger than currently recognized, potentially including multiple generations beyond direct consumers. Read more

EP294: What Is A Cardiac Arrest?

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 private cardiologist based in Hobart, author, and podcaster dedicated to helping people understand cardiovascular health and live longer, healthier lives. In this episode, he discusses cardiac arrest versus heart attacks, vaccine-related heart concerns, and warning signs of cardiac issues in young athletes, addressing listener questions about heart health risks and prevention. Key Takeaways: Heart attack and cardiac arrest are different conditions: heart attacks involve blocked coronary arteries causing pain and symptoms, while cardiac arrest is an electrical malfunction causing the heart to stop beating and requiring immediate CPR and defibrillation. Treatment priorities differ between conditions: heart attack patients need their blocked artery opened, while cardiac arrest patients first need their heart rhythm restored through defibrillators and CPR before addressing any underlying arterial blockage. mRNA vaccines (particularly Moderna) have been linked to increased inflammation of the heart muscle (myocarditis) and the sac around the heart (pericarditis), but these cases typically occur in young men, are short-lived, and rarely cause long-term problems. Data from the Baker IDI in Melbourne shows no appreciable increase in sudden cardiac death rates following vaccine introduction, despite social media amplification of concerns. Family history of sudden cardiac death is a critical warning sign; electrical abnormalities (channelopathies) and enlarged heart muscle (hypertrophic cardiomyopathy) are hereditary conditions that require screening. Rare cases of cardiac arrest in athletes can be triggered by significant chest trauma or impact during sports, even in young, fit individuals. If uncertain whether chest pain is indigestion or cardiac-related, always seek medical evaluation; however, people who have experienced cardiac events often recognize the distinctive quality of cardiac pain in future episodes. Statins are highly effective for managing high cholesterol in high-risk patients, with nearly three decades of robust clinical data supporting their use, and several promising alternative therapies are in development. Read more

EP293: Heart Rate Variability

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, keynote speaker, and CEO of the Healthy Heart Network, hosts this episode focused on helping people understand cardiovascular health. In this episode, Dr. Bishop explores the emerging topic of heart rate variability (HRV), explaining that while he doesn't routinely use it clinically, it's increasingly appearing in wearable devices and social media, prompting him to research and demystify this complex measurement for his audience. Key Takeaways Heart rate variability measures the subtle, constant changes in the intervals between consecutive heartbeats, reflecting the body's biological complexity and the interplay between the nervous system and the heart. The autonomic nervous system plays a crucial role in HRV through two opposing systems: the sympathetic (fight-or-flight) system that accelerates the heart, and the parasympathetic (rest-and-digest) system that slows it down. Heart rate variability indicates the heart's ability to adapt to changing environmental conditions—good HRV means the heart can quickly accelerate or decelerate as needed by the body. HRV measurement is far more complicated than simple soundbites suggest, involving complex mathematical chaos models and multiple assessment methods that must be measured consistently (24-hour, 5-minute, or shorter periods). The same HRV value can indicate different health outcomes depending on context; for example, increased HRV in atrial fibrillation patients is a bad sign linked to increased mortality, while decreased HRV may indicate autonomic nerve problems. Medications significantly impact HRV measurements, making interpretation challenging for individuals taking drugs that affect the autonomic nervous system. Personal wearable devices and smartphones increasingly measure HRV, but standardized baselines and consistent measurement protocols are needed to meaningfully compare data across different devices and time periods. Future applications of HRV monitoring could include early detection of developing infections, like identifying the onset of a cold before symptoms appear. Read more

EP292: Interview With Angela Peris Discussing Cardiac CT Results

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 and CEO of the Healthy Heart Network, hosts this episode featuring Angela Paris, a cardiac nurse and heart disease prevention advocate. The episode explores Angela's personal cardiac health journey, including her family history of premature coronary artery disease and her proactive approach to heart screening, demonstrating how cardiac imaging can identify and manage cardiovascular risk before a major event occurs. Key Takeaways: Family history of premature coronary artery disease (men at age 55 or less, women at age 60 or less) significantly increases personal cardiac risk and warrants early screening. Women develop coronary artery disease approximately 10 years later than men, which means screening for at-risk women should begin 5-10 years earlier than a male relative's event age to stay ahead of potential disease. Even light smoking (such as weekend-only smoking) has a measurable negative impact on cardiovascular health and can advance disease risk by approximately 10 years. CT coronary angiograms with contrast injection provide superior detail for identifying fatty plaque and tracking plaque progression compared to non-contrast calcium scoring, making side-by-side scan comparisons valuable for monitoring disease stability. The "C+ algorithm" (Calcium score, Calcium percentile, Low-attenuation plaque, Unfavorable remodeling, Stenosis, and Site/location) helps cardiologists identify the "weakest link in the chain" to assess overall cardiac risk accurately. Calcium score percentiles relative to age and gender provide more meaningful risk stratification than absolute calcium numbers alone. Left main coronary artery disease requires treatment regardless of plaque quality, as it represents the weakest link in coronary circulation and carries significant risk. Cholesterol-lowering therapy (statins) stabilizes fatty plaque and converts it to calcified plaque, making it difficult to assess plaque progression on repeat calcium scoring but more visible on contrast-enhanced CT angiograms. Read more