A severe heart attack is a medical emergency that can become life-threatening within minutes or hours. Doctors must decide very quickly which patients need the most intensive treatment and monitoring.
Until now, they have relied on symptoms, heart scans, blood tests, and other well-known risk markers. A new study from the University of Münster suggests there may be another simple way to identify patients who face the greatest danger.
The research, published in Nature Cardiovascular Research, found that a routine blood test may reveal how the body’s immune system responds during a heart attack and help predict the risk of dying within the first 30 days.
Although most people think of a heart attack as a problem that only affects the heart, the entire body reacts when blood flow to the heart is suddenly blocked. The immune system immediately becomes active because it treats damaged heart tissue like an injury. One important group of immune cells involved in this response is called neutrophils.
These white blood cells help fight infections and remove damaged tissue. Under normal conditions, only fully developed neutrophils circulate in the bloodstream. During a severe emergency, however, the bone marrow begins releasing younger and less mature cells because it needs extra immune cells as quickly as possible.
Scientists have known for almost one hundred years that neutrophil levels rise after a heart attack. What has remained unclear is whether the maturity of these cells could reveal how sick a patient really is.
To answer this question, researchers led by Professor Oliver Soehnlein studied blood samples from more than 200 people who had experienced heart attacks, strokes, or heart failure, as well as healthy volunteers. Using advanced laboratory methods, they measured how mature the neutrophils were and compared the results with each patient’s condition.
The researchers found a clear pattern. Patients with the most severe heart attacks, especially ST-elevation myocardial infarction, had the highest numbers of immature neutrophils.
They even detected extremely young cells called preneutrophils that are normally kept inside the bone marrow. The appearance of these immature cells showed that the bone marrow had entered an emergency state and was releasing every available immune cell to respond to the crisis.
Perhaps the most important finding was that patients with the largest numbers of immature granulocytes had a much greater chance of dying within 30 days. The team confirmed this result in two additional groups of several hundred patients.
Even after accounting for age and other known risk factors, the immature granulocyte count remained one of the strongest predictors of short-term survival. In fact, it performed better than several commonly used biomarkers.
One reason this discovery is exciting is that doctors do not need expensive new equipment. Immature granulocytes can be measured using a standard differential blood count, a laboratory test already performed in most hospitals around the world.
This means the test could potentially be added to routine emergency care without greatly increasing costs or delaying treatment.
If future studies confirm these findings, doctors could identify the highest-risk patients almost immediately after they arrive at hospital.
Those patients could receive closer monitoring, faster treatment, or earlier transfer to intensive care. This could improve survival by ensuring that limited medical resources are directed toward the people who need them most.
The researchers say more work is still needed before the test becomes part of everyday clinical practice. Larger studies involving different hospitals and patient populations must confirm its accuracy.
They also hope to discover exactly how the damaged heart signals the bone marrow to release these immature immune cells. Understanding this communication could eventually lead to new medicines that reduce harmful inflammation after a heart attack.
Overall, this study provides strong evidence that the immune system offers valuable clues about a patient’s condition after a heart attack. The findings are especially encouraging because they use an inexpensive blood test that is already widely available.
Although the research does not immediately change medical practice, it opens the door to faster risk assessment and potentially better treatment decisions. If confirmed, this simple test could become an important new tool for saving lives after severe heart attacks.
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Source: University of Münster.
