A recent study shows that a blood test that doctors use to determine whether a patient has had a heart attack may be inaccurate, calling it “flawed.” The faulty blood test has led to misleading results, including falsely telling patients that they have suffered a heart attack.
According to the study conducted by British researchers, the blood test at issue is commonly used by hospitals to determine whether a patient has had a heart attack or not. The blood test examines a patient’s blood for the presence of troponin, a protein that is released into a person’s bloodstream during a heart attack. One in twenty patients undergoing this test showed “high” levels of the protein; however, most of them showed no signs of suffering a heart attack.
The misleading data highlights the risk of treating patients for heart attack when they, in fact, have not had one.
Using Troponin to Diagnose Heart Attack.
Prior to this study, it has been common for doctors and health care professionals to use a patient’s troponin level to diagnose—or exclude—the presence of heart attack. The manufacturers of the troponin blood tests recommended a troponin level guideline for doctors to use in this assessment; patients with results exceeding this level, according to the manufacturer’s guidelines, should be considered abnormal and indicate a heart attack.
This test has been, therefore, a type of
lodestar for health care professionals in assessing patients for heart attack.
But this study puts that reliance into question.
The Study’s Findings.
The British study collected data on 20,000 patients over the course of three months in 2017. The researchers collected blood from each patient and tested it for troponin levels. The results showed that a little more than 5% of patients indicated levels of troponin higher than the recommended upper limit of the protein. According to the common use of the test, this would indicate that these 5% of patients had also suffered a heart attack. However, the majority of these patients were, in fact, being seen for conditions unrelated to heart attack and showed no clinical symptoms or sign of a heart attack.
Other studies, too, have shown that a patient’s troponin levels may be elevated for reasons unrelated to heart attack. The high protein level may only indicate smaller cardiac issues, especially in patients with a broad range of medical conditions. Because troponin proteins could be elevated in medical conditions other than a heart attack, researchers warn that relying on this test alone is insufficient to diagnose a heart attack.
Moving Forward with Improvements.
One proposed way to improve the test’s use is to modify it for differing patient groups, such as tailoring the test to factors such as gender, age and health status.
Researchers also emphasize the importance of educating doctors and health care professionals about how to better interpret the results of troponin blood tests. Even if a patient with a high level of troponin in the blood has not actually suffered a heart attack, the high level of the protein indicates a higher risk for subsequent cardiovascular issues.
Thus, while the troponin test still can indicate the presence of heart attack, it should be one of several factors to help guide the patient’s diagnosis—not determine it completely.