Sudden heart failure: How do conditions like diabetes, hypertension, or even viral infections increase the risk?

Sudden heart failure and cardiac death are random and unpredictable. However, research and international cardiology guidelines continue to clarify those with the highest risk. Some of the major factors are diabetes, hypertension, and viral infections, including myocarditis. Each of these factors increases the risk of arrhythmias, heart failure, and fatal cardiac events in isolation, but together they form a perfect storm that demands aggressive prevention and careful monitoring.Diabetes is known as a macrovascular disease, not simply a metabolic disease. It speeds the progress of the disease from which it derives its name, an accumulation of fatty plaques in the walls of arteries, which can eventually reduce blood flow to a trickle and cause clots. And it contributes to microvascular dysfunction, when the smallest blood vessels in the heart fail to deliver enough oxygen. Both systems are poised to cause ischemia, electrical instability, and ultimately heart failure. The issue is that diabetes also increases the risk of heart attacks, arrhythmias, and heart failure greatly compared with people who don’t have diabetes.If diabetes is the silent cardiovascular accelerator, hypertension is the noisiest and most sustained threat. It still constitutes the most important modifiable risk factor for both cardiovascular morbidity, heart failure, and sudden cardiac death. When you have high blood pressure over time, it causes your heart to work harder—stretching out the left ventricle and making it thicker (left ventricular hypertrophy or LVH). Although LVH is an adaptive response initially, it eventually leads to stiffening of the heart muscle and disturbed electrical conduction, resulting in a markedly increased susceptibility to arrhythmias and failure.The 2024 ESC Guidelines tighten their recommendations for at-risk patients, proposing that there are good enough reasons to aim tighter: the target range is now 120–129/70–79 mmHg. Open-label trials have demonstrated that reducing blood pressure to this range is associated with a large reduction in the risk of heart failure and sudden cardiac death. In patients with multiple risk factors, ie, diabetes and hypertension, attainment as well as preservation of this degree of control is critical for long-term survival.Besides chronic diseases, viral infections have become powerful causes of acute heart failure. Infections like myocarditis or COVID-19 can inflame the heart muscle, which weakens its ability to pump and interferes with its electrical rhythm. Viral myocarditis can lead to acute or fulminant heart failure even in previously healthy persons. For people with pre-existing conditions like diabetes and hypertension, the risks multiply, since an already stressed heart may not be able to withstand the additional inflammatory assault.Accompanying reports from the American College of Cardiology (ACC) and the ESC draw attention to rising rates of arrhythmias, sudden cardiac arrest, and chronic damage to the heart in people who experience viral infections. This evidence has led international guidance to suggest increased monitoring — including early diagnostic imaging, biomarker testing and close follow-up — for patients who develop chest pain palpitations or shortness of breath after viral infections. Early diagnosis and treatment of viral myocarditis can be vital to life-preserving agents.The combination of diabetes, hypertension, and a viral infection presents a clear image: that the heart is at its most vulnerable when these risk factors collide. Three messages are omnipresent in the most recent worldwide cardiology guidelines:Comprehensive control of diabetes and hypertension through a multifactorial approach for blood pressure, cholesterol, and glucose.Early identification and management of both viral myocarditis and COVID-supported cardiac epidemiology.Regular investigation and screening in the high-risk population, specifically with high-risk factors.Dr. Sandeep N, Consultant - Cardiology, Manipal Hospital Vijayawada