Heart Attacks are Preventable!

EP91: Repeat Scanning

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 practicing cardiologist and author dedicated to improving patient care through heart health education. In this episode, Dr. Bishop discusses the important topic of repeat cardiac scanning, sharing real-world cases that have shaped his evolving approach to patient monitoring and risk assessment. Through these patient stories, he explores when and why rescanning patients' hearts can be crucial for detecting disease progression and preventing cardiac events. Key Takeaways: A zero calcium score doesn't guarantee indefinite low risk—for average patients it provides about 5 years of reassurance, but this timeline is shorter for those with additional risk factors Patients with adverse risk factors like central obesity, elevated triglycerides, poor lipid profiles, or predisposition to diabetes should not be given the same long monitoring intervals as those with truly average risk profiles Non-calcific plaque can develop silently in major coronary arteries even when calcium scores remain low, potentially progressing to high-risk lesions over time Dr. Bishop is shifting his practice to recommend earlier repeat scanning (3-5 years) for intermediate-risk patients with additional metabolic risk factors rather than waiting the standard 5-10 years Plaque can progress significantly despite appropriate medical therapy, requiring intensification of treatment and closer monitoring in some cases Repeat imaging can help assess whether intensive therapy has stabilized plaque, reduced its size, or converted it from cholesterol-dominant to calcium-based forms The decision to repeat scan should be individualized based on patient risk profile, presentation, and imaging findings rather than following a one-size-fits-all protocol Intermediate risk factors like insulin resistance, triglyceride elevation, and abdominal weight gain warrant closer cardiovascular scrutiny even when initial scan results are normal Read more

EP90: Can I Stop My Statins If I Have A Zero Calcium Score?

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 practicing cardiologist and passionate health educator who hosts this podcast to help patients understand heart health through education. In this episode, he addresses a common patient question: whether someone with a zero coronary calcium score on CT imaging can safely stop taking cholesterol-lowering medications (statins). This is an important clinical question that lacks a clear-cut answer and requires individualized assessment. Key Takeaways: A zero calcium score is a very good predictor of low cardiovascular risk in average people with average risk factors, but this data doesn't necessarily apply to people with significantly elevated cholesterol levels or other high-risk characteristics. High cholesterol levels create an environment where arterial plaque can form, even if plaque hasn't developed yet—much like how living near the sea creates conditions for rust to form on steel. Just because someone has no visible plaque now doesn't mean they can safely ignore cholesterol-lowering therapy if they have persistently high cholesterol levels. A zero calcium score is reassuring for approximately five years in average patients, but this timeframe is unknown for patients with elevated cholesterol who may need closer monitoring. For patients adamant about stopping statins despite high cholesterol, a surveillance strategy should be implemented with repeated imaging every 2-3 years rather than the standard 5-year interval. Carotid artery imaging should be checked before discontinuing cholesterol therapy, as it's possible (though rare) to have a zero coronary calcium score while still having plaque in neck arteries. The decision to stop cholesterol medications requires detailed consideration of multiple factors including cholesterol levels, age, sex, family history, lipoprotein(a), weight, exercise habits, and overall risk profile. Current guidelines generally support continuing cholesterol-lowering therapy in patients with elevated cholesterol levels, regardless of calcium score results. Lifestyle modifications (avoiding cigarettes, controlling blood pressure, maintaining healthy weight, regular exercise, and good diet) are essential factors in any decision to discontinue medication. There is no one-size-fits-all answer to this question; it requires individualized discussion and a tailored monitoring plan between patient and physician. Read more

EP89: High Calcium Score May Not Be All Bad

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. Warrick Bishop, a practicing cardiologist and patient educator, shares an intriguing case study of a 60-year-old fit and active man who experienced an alarming heart rhythm abnormality during a stress test. Despite having a high coronary calcium score, advanced imaging revealed an unexpectedly positive clinical picture that challenged conventional risk assessment interpretations. Key Takeaways: Lipoprotein(a) or "Lp(a)" is a cholesterol carrier in the bloodstream that is more likely to cause inflammation, blood clotting, and arterial calcification, and can run in families. Nicotinic acid (a B-group vitamin) and statins are used to lower lipoprotein(a) levels and manage high cholesterol in at-risk patients. During stress testing, the patient developed ventricular tachycardia (VT), a broad complex tachycardia that is considered a cardiac emergency and can be potentially fatal. A calcium score over 1,000 in the 90th percentile would typically indicate very high risk, but this patient's CT angiography showed no soft, cholesterol-dominant plaque. The absence of soft, non-calcific plaque is significant because this type of plaque is most likely to rupture and cause heart attacks, whereas calcified plaque is more stable and inert. Long-term statin therapy, exercise, and niacin treatment likely converted the patient's soft plaque into stable calcified plaque, stabilizing his arterial condition. The patient's rhythm abnormality during stress testing was more likely caused by minor electrical dysfunction rather than poor blood flow to the heart muscle. Comprehensive CT imaging with both calcium scoring and contrast-enhanced angiography provides more complete diagnostic information than calcium scores alone. Read more

EP88: When Heart Valves Fail: Aortic Stenosis

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 practicing cardiologist and author dedicated to educating patients about heart health, believing that informed patients receive better care. In this episode, he explains how heart valves function normally and what happens when they fail, using detailed anatomical descriptions and clinical examples. The discussion focuses primarily on aortic valve dysfunction and the critical factors cardiologists consider when deciding if and when valve replacement is necessary. Key Takeaways The heart's circulation can be visualized as a single tube with the lungs at the top, capillaries at the bottom, and continuous blood flow managed by four one-way valves: tricuspid, pulmonary, mitral, and aortic. Heart valves fail in two primary ways: stenosis (narrowing that blocks blood flow) or regurgitation/incompetence (leaking that allows blood to flow backward). Sudden heart valve failure is typically due to regurgitation (leaking), while stenosis (narrowing) develops gradually over years or decades. Aortic valve stenosis is assessed using two key measurements: the valve area (critical concern when less than 1 cm²) and the pressure gradient across the valve (severe when 80+ mmHg). A narrowed aortic valve forces the left ventricle to work harder, causing the heart muscle to thicken over time as compensation, which can eventually lead to muscle failure if untreated. Secondary complications can occur from aortic stenosis, including mitral valve regurgitation, as the stressed left ventricle may leak blood backward onto the mitral valve. Timing of valve replacement is critical—surgery that occurs too early exposes patients to surgical risks without symptom improvement, while surgery delayed too long risks heart muscle failure or sudden cardiac death. The optimal timing for valve replacement follows a "Goldilocks principle": when patients begin experiencing symptoms, the valve is severely narrowed, and surgical risk is lower than the risk of leaving the damaged valve in place. Read more

EP87: Radio Station Interview - World's Most Amazing People

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 practicing cardiologist and author from Australia dedicated to improving patient care through heart health education. In this episode, he discusses his three books—Atrial Fibrillation Explained, Know Your Real Risk of Heart Attack, and Have You Planned Your Heart Attack?—and shares his mission to help patients become better informed about their cardiovascular health. His passion for prevention was sparked by a pivotal moment when he failed to predict a heart attack in a patient he had seen 18 months prior. Key Takeaways: Atrial fibrillation is a common condition affecting nearly 20% of people over 80 and about 1% of the general population, often causing irregular heartbeats that can lead to stroke and serious complications. Current population-based risk assessment for heart attack is like "rolling the die and gambling," and modern technology can provide more precise, personalized risk evaluation. Dr. Bishop's career shift toward prevention was catalyzed when he resuscitated a patient on the roadside whom he had previously reassured about heart attack risk 18 months earlier. Not all doctors are aware of the latest prevention techniques and imaging technology because specialization means different cardiologists focus on different areas of practice. Advanced imaging technology from leading experts like Professor Matthew Budoff at UCLA can reveal coronary artery disease that traditional risk calculations miss. Education empowers patients to have informed conversations with their doctors about whether advanced testing and preventive measures are appropriate for their individual circumstances. A real-life example: Dr. Bishop identified severe coronary artery disease in a patient named John who sought care after witnessing another driver's heart attack, potentially saving his life. Early intervention and proper medication combined with surveillance plans can prevent life-threatening cardiac events in at-risk patients. Educated patients consistently receive better healthcare outcomes than those without adequate information about their condition. Prevention is the ultimate goal, as many heart attacks are avoidable tragedies that can be prevented with proper awareness and proactive medical care. Read more

EP86: What Goes Wrong With Heart Failure?

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 Introduction Dr. Warrick Bishop is a practicing cardiologist and author dedicated to educating patients about heart health, hosted on the Healthy Heart Network. In this episode, Dr. Bishop explains the cascade of physiological responses that occur when the heart fails to function properly, exploring how the body's evolutionary defense mechanisms—designed to handle blood loss—actually worsen cardiac failure in modern times. Key Takeaways: The body's response to cardiac failure is based on evolutionary mechanisms designed to handle blood loss millions of years ago, not heart dysfunction, creating a problematic mismatch in modern medicine. When the heart doesn't pump efficiently, the body incorrectly registers this as blood volume loss and triggers a neuro-humoral (nerve and hormone-based) response to preserve circulation. The body responds to perceived blood loss by constricting blood vessels to maintain blood pressure and retaining fluid to replenish perceived lost volume—both of which worsen the failing heart's condition. Sympathetic nervous system activation causes the heart to race as part of the "fight or flight" response, further increasing the workload on an already struggling heart. This creates a vicious cycle where the body's protective responses actually load the heart with more volume, higher blood pressure resistance, and increased heart rate, making cardiac failure progressively worse. Associated conditions like atrial fibrillation and coronary artery disease commonly complicate cardiac failure by placing additional strain on the compromised heart. Poor cardiac output reduces blood flow to skeletal muscles, causing fatigue, and impairs kidney filtration, which is dependent on adequate blood flow. Cardiac failure disrupts iron absorption through inflammatory and sympathetic nervous system changes, potentially leading to anemia that further worsens heart function and overall health. Poor cardiac output during day and night hours leads to sleep disturbances, causing memory problems, confusion, and depression that compound the patient's condition. Understanding these interconnected mechanisms is crucial for developing treatment strategies that interrupt the cascade and protect the heart long-term. Read more

EP85: More Specific Tests For Heart Failure

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 practicing cardiologist and author dedicated to improving patient care through heart health education, operating the Healthy Heart Network. In this episode, he provides a detailed examination of the specific diagnostic tests used to evaluate cardiac failure, building on previously discussed foundational approaches. The episode focuses on helping patients understand the various imaging and laboratory tools cardiologists employ to accurately diagnose and assess heart problems. Key Takeaways: Echocardiography (ultrasound of the heart) is the single most important go-to test for evaluating cardiac failure, providing real-time dynamic images of how the heart beats and contracts. The ejection fraction—the percentage of blood the left ventricle expels with each beat—is a critical measurement obtained from echocardiograms that helps determine cardiac function status. Echocardiograms can identify whether heart problems are global (affecting the entire heart equally) or regional (affecting specific areas), with regional abnormalities often indicating blocked blood vessels or previous heart attacks. Brain Natriuretic Peptide (BNP) testing detects heart strain by measuring a substance released by heart cells under stress, serving as a valuable discriminator between cardiac and non-cardiac causes of symptoms. BNP levels are useful for long-term monitoring of valve abnormalities, with changes in BNP helping confirm whether the heart is genuinely deteriorating when compared alongside echocardiogram findings. Coronary artery disease evaluation through stress testing, CT imaging, or invasive coronary angiography is essential when diminished heart function is detected, as many cases are treatable. Cardiac Magnetic Resonance Imaging (CMR) provides excellent visualization of scar tissue and inflammation within the heart muscle, crucial information for determining future management strategies. Heart biopsy is a rare but occasionally necessary procedure that involves extracting tissue samples to examine at the cellular level when other tests fail to provide definitive answers. Read more

EP84: Diagnosis and investigation of Heart Failure

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 practicing cardiologist and author dedicated to educating patients about heart health, believing that informed patients receive better medical care. In this episode, he provides a comprehensive overview of diagnosing and investigating cardiac failure, starting with the fundamental approaches of patient history and physical examination. The discussion covers the key symptoms, clinical findings, and initial diagnostic tests used to identify and assess heart failure in patients. Key Takeaways: Shortness of breath is a primary symptom of cardiac failure and can be quantified using the New York Heart Association classification system (levels 1-4), with level 4 representing severe limitation even at rest. Orthopnea (shortness of breath when lying flat) and paroxysmal nocturnal dyspnea (PND—waking at night gasping for air) are specific breathing symptoms caused by fluid redistribution in the body and are important diagnostic indicators. Swelling in the legs and ankles, including subtle signs like sock marks or pitting edema, represents fluid accumulation and is a key symptom patients should report to their physicians. A complete cardiac history must include childhood health events (murmurs, surgery, rheumatic fever), family history of heart disease, previous heart attacks, and blood pressure history to identify underlying causes. During physical examination, doctors assess jugular venous pressure by observing the neck's jugular vein as a "dipstick" to the right atrium, which reveals elevated fluid pressures characteristic of heart failure. Heart murmurs and extra heart sounds detected through auscultation provide valuable clues about valve function and how the heart has compensated for dysfunction. Fine crackly sounds (crepitations) heard at the lung bases indicate fluid accumulation in the lungs and are a key sign of cardiac failure severity. A 12-lead ECG reveals heart rate, rhythm abnormalities, and whether the heart shows signs of strain or enlargement through changes in the QRS complex. Chest X-rays display heart size and show characteristic "curly B-lines" within the lungs that correspond to fluid accumulation seen in cardiac failure. Routine blood tests assess kidney function, electrolyte balance, liver health, infection status, anemia, thyroid function, and iron levels to identify reversible drivers of heart failure symptoms. Read more

EP83: How Do We Classify Heart Failure?

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 practicing cardiologist and author dedicated to improving patient care through education about heart health. In this episode, Dr. Bishop explains the classification systems used to categorize heart failure, emphasizing that understanding these distinctions helps patients and caregivers grasp their condition better. The episode focuses on two primary ways cardiologists classify cardiac failure: by timeline (acute vs. chronic) and by heart function level (based on ejection fraction). Key Takeaways: Heart failure is classified using two main distinctions: the timeline of onset and how well the heart is functioning. Acute cardiac failure develops rapidly and is commonly caused by coronary artery disease, heart attacks, severe blood flow restriction, arrhythmias, infections, or sudden valve failure. Chronic cardiac failure develops progressively over time and is the more commonly seen type in clinical practice, often resulting from conditions like prolonged high blood pressure, valve problems, or ongoing blood flow issues. Ejection fraction measures the percentage of blood expelled from the left ventricle with each heartbeat, with a normal ejection fraction typically around 60%. Heart failure with reduced ejection fraction (HFrEF) occurs when ejection fraction is 40% or less, representing significantly diminished pumping ability. Heart failure with preserved ejection fraction (HFpEF) occurs when ejection fraction is 50% or higher, often caused by diastolic dysfunction or poor relaxation of the heart. Heart failure with moderately reduced ejection fraction represents cases where ejection fraction falls between 40-49%, filling a gap between reduced and preserved categories. Understanding these classifications helps educated patients and their families better comprehend their diagnosis and engage more effectively in their care. Read more

EP82: How Can We Prevent Heart Failure?

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, a practicing cardiologist and author, hosts this episode of his Healthy Heart Network podcast focused on heart disease prevention. He discusses practical, long-term strategies that patients can implement with their local doctors to prevent heart failure before it develops. The episode emphasizes that educated patients receive better healthcare outcomes through understanding the preventable risk factors for cardiac disease. Key Takeaways: The most common causes of heart failure are coronary artery disease, myocardial infarction (heart muscle death from blocked blood supply), and ischemia (reduced blood flow through narrowed arteries). Regular blood pressure monitoring and control is critical, as elevated blood pressure strains the heart and can eventually lead to heart failure. Routine doctor visits should include listening to the heart for valve problems, which can be detected early without invasive testing. Genetic conditions affecting the heart muscle run in families and warrant screening conversations with your GP and potential referral to a cardiologist for early detection and treatment. Obesity and obstructive sleep apnea create a harmful combination that damages heart health, making weight management and sleep quality essential prevention strategies. Lifestyle modifications including smoking cessation, moderate alcohol consumption, weight control, and regular exercise significantly reduce heart failure risk. Medical treatments such as cholesterol management and blood pressure medication are important components of long-term heart failure prevention. Sodium-glucose transport inhibitors (SGLT2 inhibitors) show promising benefits in reducing heart failure development in diabetic patients. Patients should seek evaluation for nighttime snoring, as it may indicate sleep apnea requiring treatment. Read more