Landmark research has revealed that almost everyone who experiences a heart attack, stroke, or heart failure exhibits warning signs years before the event, profoundly challenging the widespread belief that cardiovascular disease can strike 'out of the blue'. The study, which meticulously tracked millions of individuals across South Korea and the United States, found that over 99 percent of patients had at least one major risk factor long before their first cardiac emergency. High blood pressure, also known as hypertension, emerged as the most prevalent culprit, affecting more than nine in ten participants.

Scientists from Northwestern University in Chicago and Yonsei University in Seoul meticulously analyzed medical records for over 9.3 million adults in South Korea and nearly 7,000 in the U.S. They were able to follow participants for up to two decades, leveraging routine health screenings that captured crucial data on blood pressure, cholesterol, glucose levels, and smoking history. By cross-referencing these records with subsequent diagnoses of heart attack, stroke, or heart failure, researchers precisely identified the health problems present years before the onset of a cardiovascular event.

The findings were striking across both demographic groups: more than 99 percent of individuals who later developed cardiovascular disease had at least one 'non-optimal' risk factor beforehand, with over 93 percent having two or more. Beyond high blood pressure, other significant factors included elevated blood sugar or a diabetes diagnosis, high cholesterol, and a history of tobacco use. Even among younger women, typically considered to be at lower risk, more than 95 percent showed at least one red flag before experiencing stroke or heart failure.

Dr. Philip Greenland, senior author and professor of cardiology at Northwestern University Feinberg School of Medicine, emphasized the findings: 'These findings show very convincingly that exposure to one or more nonoptimal risk factors before cardiovascular outcomes is nearly 100 percent. The goal now is to work harder on controlling these modifiable risk factors, rather than being distracted by other factors that are not easily treated and not causal.'

Cardiovascular disease remains the leading global cause of death, claiming an estimated 18 million lives annually and accounting for a quarter of all deaths in the UK. Experts stress that these new findings underscore the critical importance of early detection and prevention. Disturbingly, NHS figures indicate a rise in hospital admissions for heart attacks among people in their 30s and 40s in recent years, despite most cardiac events still occurring in older age groups. In the US, heart attacks among adults under 40 have been increasing by approximately two percent annually, and strokes in adults aged 18 to 44 have risen by roughly 15 percent over the past decade.

This worrying trend in younger adults is primarily attributed to factors such as obesity, high blood pressure, and type 2 diabetes, which are becoming increasingly prevalent at younger ages. Cardiologists also point to poor diet, insufficient exercise, and high stress levels as contributors to this emerging generation of patients who would once have been deemed too young for heart disease. Doctors express concern that younger patients are frequently overlooked, as heart disease is still predominantly perceived as an 'older person's' ailment, leading to missed opportunities for vital early intervention.

Many key risk factors, such as raised blood pressure, cholesterol, and blood sugar, can often be effectively managed through lifestyle modifications, including improved diet, regular exercise, and smoking cessation, as well as with medication. However, a significant challenge arises because many individuals are either unaware they have these conditions or struggle to keep them under control. High blood pressure, for example, is often dubbed the 'silent killer' precisely because it rarely presents symptoms until it has already inflicted damage on the heart or blood vessels. Lead investigators advocate for health services to place a greater emphasis on identifying these risk factors during middle age, ideally before irreversible harm occurs. Routine screenings, particularly for blood pressure and cholesterol, could be instrumental in spotting problems in individuals who otherwise feel healthy. This pivotal study, funded by the National Research Foundation of Korea, has been published in the Journal of the American College of Cardiology.