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Sidelined

03 Apr 2019
Guest Author
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abdomen, acetaminophen, antigen, athletes, CT scan, Epstein-Barr, fatigue, fever, heterophile antiboyd, hydration, infectious mononucleosis, Lindasy Lafferty, liver, lympahtic system, mono, mononucleosis, monospot, pain releif, Penn State Health, rest, sore throat, spleen enlargenment, splenic rupture, sports, swollen glands, ultrasound, viral capsid antigens, virus

Infectious Mononucleosis: Know the Risks

Infectious mononucleosis, or mono, sidelines high school athletes every year. Kids who play sports aren’t more susceptible to the disease. Instead, adolescent competitors are at a greater risk for one of the illness’s serious complications — splenic rupture.

A gymnast performs on the high bar. (Photo: Getty Images)

Infectious mononucleosis sidelines athletes because they are at a greater risk splenic rupture. (Photo: Getty Images)

Mono starts with fatigue, sore throat, fever and swollen glands. By then, it has invaded the lymphatic system, which can cause spleen enlargement. For athletes, that is a danger because the trauma and pressure on the abdomen involved in many sports can cause the spleen to burst.

”It’s rare — occurring in less than 0.5 percent of patients — but an infected athlete can rupture their spleen without warning within 21 days after symptoms begin,” said Dr. Lindsay Lafferty, a primary care sports medicine physician at Penn State Health. “The rate declines after four weeks, but ruptures have occurred up to eight weeks after an athlete first notices symptoms.”

The onset of mono can be challenging to identify because of its long incubation period and the variable nature of symptoms. Heterophile antibody, or monospot, testing is commonly used to diagnosis it. Antigen testing for the Epstein-Barr virus and viral capsid antigens can provide a more definitive diagnosis earlier.

An illustration of a person showing the main symptoms of infections mononucleosis. (Image: iStock)

Infectious mononucleosis is caused by the Epstein-Barr virus and spread through saliva. (Image: iStock)

 
Lafferty said it is also challenging to determine whether a spleen may rupture. Ultrasounds and CT scans are unreliable because the normal size of a spleen fluctuates. Without a baseline measurement, imaging can’t accurately determine if a spleen is enlarged or in danger of rupture.

“Physical examination of spleen size identifies as few as 17 percent of cases, so deciding when the time is right for a student athlete to return to play can be complex,” she said.

Treatment for mono includes rest, hydration and pain relief. Acetaminophen should be used with caution given the effects mono can have on the liver. Recovery may take months in prolonged cases. Protective equipment, such as flank jackets or protective braces, haven’t been shown to reduce splenic rupture and aren’t recommended. Isolation isn’t necessary, but hand-washing and avoiding the sharing of water bottles can help prevent transmission.

“Athletes may resume non-contact play and exercises that don’t include lifting weights 21 days after the onset of mono if their symptoms have vanished, and they can to return to full play after 28 days,” Lafferty said.

Article by Scott Gilbert of Penn State Health
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