A trial in accident and emergency departments (A&E) found that a new way of measuring troponin—a protein released into the blood after a heart injury—could reduce future heart attacks in at-risk patients by 10 percent after five years.
According to a University of Edinburgh research team, patients with a heart muscle injury caused by other heart conditions—such as heart failure, heart valve conditions, and heart arrhythmias—benefitted the most from the new troponin measurement method.
The research team found that these patients saw a nearly 10 percent drop in future hospital admissions and deaths in the five years after getting the new test, compared to those who had the older, less sensitive test.
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Troponin Measurement Test
The updated test measures very low levels of troponin in the blood much more accurately than older versions, the research time observed.
Troponin is released into the blood during a heart attack or when the heart is injured due to other heart conditions. Different troponin blood tests have been used for years by doctors to help diagnose these conditions in people with chest pains and related symptoms.
To assess the benefits of the new test, the researchers studied the results of nearly 50,000 people who arrived at 10 emergency departments across Scotland with a suspected heart attack between 2013 and 2016.
“In the past, clinicians could have been falsely reassured by the results of the less sensitive troponin test, discharging patients that appeared to not have heart disease,” Ken Lee, MD, clinical lecturer in Cardiology at the University of Edinburgh.
This new high-sensitivity test is the tool they needed, prompting them to look deeper and helping them to identify and treat both heart attacks and less obvious heart problems. In our trial, introducing this test led to an impressive reduction in the number of future heart attacks and deaths seen in this at-risk group.
The researchers used routinely collected health record data and DataLoch, a data service, to follow all participants for five years.
Spotting High Troponin Levels
The new test revealed that more than 10,000 patients had high troponin levels, indicating heart injury. With the high sensitivity picking up more subtle warning signs, around one in five of these patients were only spotted by the new test.
By identifying heart injury in patients who may otherwise have gone unnoticed and untreated, the researchers hope that more people could receive the specialist heart care they need to avoid more serious events in the future.
“Medical professionals in emergency departments need the most efficient and accurate tools to look after people,” says professor Sir Nilesh Samani, medical director at the British Heart Foundation. “This particularly applies to those who arrive with a suspected heart attack. Such a time-sensitive and life-threatening condition requires the very best diagnostic tests. It is very encouraging to see that the new test trialled here is better at predicting long-term outcomes for these patients, whether they had a heart attack or a different kind of heart injury. This can lead to improved care for such patients.”
The study, published in the BMJ, was funded by the British Heart Foundation