New research suggests that a simple blood
test, which doctors currently use to diagnose heart attacks, may be
useful in predicting the risk of cardiovascular disease.
According to the latest statistics from the American Heart
Association (AHA), almost half of the people living in the United States
have some form of cardiovascular disease. In fact, according to 2016
figures,
121.5 million
US adults, or 48% of the entire population, have cardiovascular disease (CVD), which is a cluster of conditions that includes
hypertension. Doctors often call hypertension the "silent killer" because it does not show any visible symptoms until it is too late.
The same AHA report predicts that by 2035, over 130 million adults
will have a form of CVD that could bring costs in the United States to
1.1 trillion dollars. Currently,
heart disease is the leading cause of death in the United States, while
stroke is the fifth.
But what if there was a blood test that could accurately predict
whether a person will have heart disease or a stroke? New research
suggests that such a test may already exist. By detecting the blood
levels of specific proteins that heart muscles release when they are
injured, scientists may be able to predict a person's risk of eventually
developing CVD.
Dr. Christie Ballantyne, who is the
cardiology
chief at Baylor College of Medicine in Houston, TX, and his team,
detail this idea in a new study that appears in the AHA journal
Circulation.
Troponin levels can predict CVD risk
Troponins
are proteins that signal heart muscle damage, and in the new research,
Dr. Ballantyne and his colleagues wanted to see if detecting troponin in
the blood of healthy middle-aged adults or seniors could predict CVD
risk.
Dr. Ballantyne and colleagues analyzed a group of 8,121 people aged
54–74 who participated in the "Atherosclerosis Risk in Communities"
study. None of the participants had a history of cardiovascular disease.
The scientists identified troponin levels in 85% of the participants
and applied Cox proportional hazards models to examine the links between
these levels and cardiovascular disease. Namely, they studied
correlations with
coronary heart disease, myocardial infarction, ischemic stroke, atherosclerotic cardiovascular disease,
heart failure hospitalization, global cardiovascular disease, and all-cause mortality.
The research found that high levels of troponin correlated strongly
with "increased global CVD incidence in the general population
independent of traditional risk factors." High-sensitivity troponin
tests, therefore, proved to be an accurate way of predicting CVD risk,
especially when combined with a standard method of calculating a
person's 10-year cardiovascular risk.
"What we're finding out is that these tests can be used in the
general population to give us information as to who is most likely to
have a future problem, whether it be a
heart attack,
stroke, or heart failure," says Dr. Ballantyne. "If you can treat
someone much earlier, before [they] have symptoms, you will be far more
effective in preventing events," continues the researcher, who adds,
"Our major problem is that we do too little, too late."
"If the first time you find out that you're at risk for heart failure
is when you actually start getting short of breath and you end up in
the hospital, you probably have advanced heart disease already, and it
is going to be harder to treat than if that person took steps years
earlier."
—Dr. Ballantyne
Instead, knowing the risk in advance can prompt people to take preventive measures, such as exercising more and watching their
blood pressure.
However, the scientists explain that although doctors currently use
troponin tests to diagnose a heart attack, they do not yet accept them
as a tool for predicting risk. Scientists
need to do more research
before using these tests to evaluate risk.
"Research in this area is leading us toward individualized care more
and more, so we can better predict who's at risk for developing adverse
cardiovascular outcomes,"
comments
Dr. Rebecca Vigen, an assistant professor of internal medicine at the
University of Texas Southwestern Medical Center in Dallas, who did not
participate in the research. "This study is a step in the direction of
personalizing care," Dr. Vigen says.
To read more, click
here.