Heart Attacks are Preventable!

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

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. Read more

EP290: Undestanding Blackouts: Causes and Treatments

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 syncope (blackouts) and their various causes. The episode provides a comprehensive breakdown of how blackouts occur, emphasizing that many could be prevented with proper knowledge. Dr. Bishop aims to help listeners understand critical health conditions to improve their quality of life and potentially save lives. Key Takeaways: Blackouts (syncope) are a serious medical concern that can have catastrophic consequences, including falls causing fractures, motor vehicle accidents, and sudden loss of consciousness. Heart-related blackouts can stem from valve problems (such as aortic stenosis) or abnormal heart rhythms, including atrial tachycardia (fast rhythms from the upper heart) and ventricular tachycardia/fibrillation (dangerous fast rhythms from the lower heart). Slow heart rhythms or heart blocks, where the heart misses multiple beats, can also cause blackouts and require evaluation through devices like loop recorders that continuously monitor cardiac activity. Brain-related blackouts can be caused by strokes (either from blood clots or bleeding) or seizures, and may require electroencephalographs (EEGs) to assess abnormal brain electrical activity. Blood pressure drops, particularly from medication increases or dehydration, are a common cause of blackouts and are especially problematic in neurological conditions like Parkinson's disease. Vasovagal episodes (simple faints triggered by the vagus nerve and parasympathetic nervous system) are the most common cause of blackouts and are typically preventable and less concerning for driving privileges. Distinguishing between different causes of blackouts is critical because heart and brain-related syncope may require temporary suspension of driver's licenses until proper diagnosis is confirmed. The parasympathetic nervous system (the "rest and digest" response) can lower heart rate and blood pressure so significantly that profound vagal responses trigger loss of consciousness. Read more

EP289: Cardiovascular Treatment

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 provide an overview of cardiovascular treatments and interventions. The episode covers a comprehensive range of approaches to managing heart disease, from lifestyle modifications to cutting-edge medical technologies, with the goal of helping people understand how to prevent and treat cardiovascular issues that affect millions of Australians. Key Takeaways: Lifestyle modifications—including diet, exercise, and weight management—should be the first consideration for any cardiovascular intervention, as most heart attacks could potentially be prevented with proper knowledge and behavior changes. A Mediterranean-style diet is broadly recommended, emphasizing healthy greens, olive oil, fish, nuts, and limited bread and pasta, rather than the stereotypical Italian diet of daily pizza and pasta. The recommended exercise guideline is five episodes of 30 minutes of moderate-intensity activity like brisk walking per week, though research suggests 7,500 steps daily provides similar cardiovascular benefits to the commonly cited 10,000 steps. Resistance and weight training are increasingly supported by research as beneficial for cardiovascular health by stressing both muscles and bones. Weight management is easier when done incrementally—losing 1-4 kilos is far simpler than losing 15-20 kilos, making early intervention important. Preventative medications include aspirin, blood pressure and cholesterol-lowering drugs, blood thinners, and four cornerstone therapies for cardiac failure, while symptomatic medications address angina, fluid buildup, and irregular heart rhythms. Stents and bypass grafting are established interventional techniques for treating arterial blockages, with stents being minimally invasive and widely available with continuously improving technology. Percutaneous valve implantation—inserting valves through small leg incisions rather than open-heart surgery—represents an exciting frontier, with aortic valves currently most commonly targeted and mitral and tricuspid valves soon to follow. Electrophysiological ablation uses specialized catheters to break problematic heart rhythm circuits through cold, heat, or radio frequency therapy, offering a minimally invasive alternative to traditional defibrillation. Emerging technologies such as stem cell therapy for damaged hearts and mRNA-based cardiovascular therapies are expected to become prominent within the next five to ten years. Read more