Cardiovascular HealthMar 15, 2026
Most people hear "dysrhythmia" and think of a heart skipping a beat. But the term actually describes any abnormal rhythmic electrical activity in the body, and that includes your brain and your stomach. Cardiac dysrhythmias get the most attention for good reason: they range from completely harmless extra beats to rhythms that can cause stroke or sudden death. But the broader picture matters if you want to understand what your body's electrical systems are actually doing.
In a UK cohort of more than 500,000 adults, new rhythm abnormalities showed up at a rate of 4.7 per 1,000 person-years. The most common culprits were atrial fibrillation, bradyarrhythmias (slow rhythms), and conduction disease. These aren't rare oddities. They're a routine part of aging, and the risk factors that drive them are largely the same ones behind other cardiovascular problems.
Cardiovascular HealthMar 15, 2026
An abnormal ECG reading can point to something that needs urgent attention, or it can mean almost nothing at all. The difference depends on three things: what kind of abnormality showed up, whether you have symptoms, and what your overall cardiovascular risk looks like. This article walks you through how those pieces fit together so you can have a more informed conversation with your doctor and know when to push for faster follow-up.
Heart RateMar 15, 2026
Heart rate variability (HRV) has become an increasingly popular biomarker for assessing cardiovascular health, stress resilience, recovery, and even broader wellness outcomes. Traditionally, HRV has been measured using electrocardiograms (ECGs) in clinical settings, but consumer wearables like the Apple Watch have brought this technology into the hands of millions. With this new accessibility comes a critical issue: can HRV data collected from the Apple Watch be considered medically accurate enough to inform health decisions?
The Apple Watch has undergone extensive evaluation across a variety of populations and contexts, from healthy individuals at rest, to patients with chronic cardiovascular conditions, to users performing exercise. This article explores the clinical evidence supporting its accuracy, identifies situations where it performs well, and highlights its limitations compared to gold-standard medical devices.
Heart RateMar 15, 2026
When people fall ill, one of the first things they may notice is that their body feels different. Fever, fatigue, and rapid breathing are common signs that something is wrong. But what about the heart? If you check your pulse during illness and find it racing at 120 beats per minute, you might wonder: is this normal, or a sign of something more serious? Understanding the connection between sickness and heart rate requires examining how the body responds to infection and fever, as well as what doctors consider a healthy or dangerous range for the heart.
Cardiovascular HealthMar 15, 2026
Junctional tachycardia, often called junctional ectopic tachycardia or JET, is the single most common early arrhythmia after congenital heart surgery in children. It shows up in roughly 2 to 14% of pediatric surgical cases, typically within 72 hours of the operation. Despite being well recognized, treatment options remain limited, and the condition can significantly prolong time on a ventilator and in the ICU. For parents navigating a child's heart surgery, or for the rare adult who develops this rhythm, understanding what JET is and how it's managed matters more than most people realize.
What makes JET particularly tricky is its mechanism. Unlike many fast heart rhythms that loop in a short circuit (called reentry), JET arises from abnormal automatic firing in the atrioventricular node or His bundle region, the electrical relay station between the upper and lower chambers of the heart. That distinction isn't just academic. It changes which drugs work, which don't, and why some standard arrhythmia treatments fall short.
Cardiovascular HealthMar 13, 2026
Catheter ablation is the most effective long-term treatment for atrial tachycardia, yet medications, the usual first step most people encounter, have only moderate long-term efficacy. That gap between what works best and what you're likely to be offered first is worth understanding if you or someone close to you has been diagnosed with this rhythm disorder.
Atrial tachycardia (AT) is a type of supraventricular tachycardia (SVT), meaning the abnormally fast heartbeat originates above the ventricles, specifically in the atria (the upper chambers of the heart). Unlike some other SVTs, AT fires independently of the AV node (the electrical relay station between your upper and lower chambers). It is less common than other SVTs, but it is clinically important because, if it becomes incessant, it can lead to cardiomyopathy or heart failure.
Metabolic HealthMar 13, 2026
Cardiovascular disease (CVD) and diabetes are two of the most prevalent and deadly chronic conditions in the world. These diseases often coexist, share many of the same risk factors, and amplify each other’s progression. As clinicians look for better ways to manage and prevent them, attention has turned to subtle physiological signals that may offer early warnings. One of the most promising is heart rate reserve (HRR).
Heart rate reserve, the difference between a person’s resting heart rate and their maximum heart rate during exertion, is far more than just a fitness metric. It may be a vital tool in detecting and preventing metabolic and cardiovascular decline. By reflecting both cardiovascular efficiency and autonomic nervous system health, HRR could help identify individuals at high risk for diabetes and heart disease before traditional symptoms appear.
