Health Problems

Infective endocarditis increases tenfold in North Carolina

The number of hospitalizations and the number of surgeries to treat drug-associated infective endocarditis have both increased over tenfold in North Carolina, according to researchers at the University of North Carolina at Chapel Hill.

Endocarditis is an infection of one or more heart valves. Usually, this condition is seen in older patients as these valves age and become weaker. Yet, bacteria introduced into the body through injection drug use can also cause endocarditis, a phenomenon doctors around the state are seeing in startling rates.

“Drug-associated infective endocarditis is markedly increasing across North Carolina,” said Asher Schranz, M.D., the study’s author and a fellow in the UNC Division of Infectious Diseases. “It causes severe illness, and treatment is expensive. This condition has been somewhat overlooked, but it is a huge problem that needs appropriate attention.”

Schranz presented the study’s findings at IDWeek in San Francisco in October.

In collaboration with colleagues at Duke University and the N.C. Division of Public Health, Schranz studied state data on endocarditis hospitalizations from 2007 to 2017. They found a tenfold increase in the number of hospitalizations due to drug-associated infective endocarditis, with the most significant spike in the past four years. As recently as five years ago, less than 10 heart valve replacement surgeries were done to treat drug-associated endocarditis. Now, 109 surgeries are done annually in North Carolina to treat drug-associated endocarditis, and overwhelmingly occur in young persons. The median age of persons undergoing surgery for this condition is 33.

And these surgeries come with an expensive price tag. The median hospital charge for the entire hospitalization with valve replacement surgery $251,000. More than 280 drug-associated endocarditis valve replacement surgeries were performed in North Carolina over the past 10 years, totaling about $78 million.

“We found that 73 percent of patients with drug-associated infective endocarditis were uninsured or on Medicaid,” Schranz said. “This means the cost of the surgery and hospitalization are absorbed by patients, individual hospitals, and government budgets, which finance Medicaid.”

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