What killed Muhammad Ali?

(CNN)Boxing legend Muhammad Ali will be laid to rest Friday, one week after he died at age 74. Ali had been publicly battling Parkinson's disease for more than three decades, so it came as a surprise to many that his official cause of death, according to family spokesman Bob Gunnell, was "septic shock due to unspecified natural causes."

"Sepsis is the body's overwhelming and life-threatening response to an infection, which can lead to tissue damage, organ failure and death," according to the Centers for Disease Control and Prevention.
    "A direct link from Parkinson's to sepsis is a long jump. However, there are several features of Parkinson's -- especially later in the course of the illness -- that can place a patient at higher risk for [developing] an infection, which can get into the bloodstream and cause them to become septic," said Dr. Michael S. Okun, national medical director of the National Parkinson Foundation.
    Parkinson's patients are at higher risk when hospitalized because the disease "can set up a scenario that decreases the threshold for getting an infection and makes it more difficult to clear the infection," said Okun, who is also the chairman of neurology at the University of Florida.



      Muhammad Ali dies at 74


    Okun calls Parkinson's the most complex disease in clinical medicine, because it has so many symptoms and such a wide variety of treatments. "Physically, a patient can experience motor tremors, stiffness, slowness and shuffling of the feet," he said. "Non-motor conditions include depression, anxiety and sleeping problems, just to name a few. Multiple studies show that the more disabling features are the non-motor features."
    "Once you have an infection in the system, it makes it more difficult for Parkinson's patients to exist," Okun said. "It's harder to walk, their tremors get worse, but it is rare for them to die of sepsis."
    Okun encourages Parkinson's patients and their families to avoid hospitalizations whenever possible, opting instead for an outpatient setting. Of course, that won't be feasible in all cases, such as when a patient develops a breathing problem or pneumonia. In Ali's case, Okun says, "Sepsis wasn't caused by the hospitalization; it happened as the result of an infection."

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    For all patients, with and without Parkinson's -- and there are certainly far more without -- "Early, aggressive treatment boosts your chances of surviving sepsis," according to the Mayo Clinic. That treatment might include medications like antibiotics, administering oxygen or IV fluids, or being placed on dialysis. In some extreme cases, surgery might even be needed to remove an infection.
    When it comes to preventing sepsis, the CDC recommends getting vaccinated against the flu, pneumonia and other infections that can lead to sepsis. It also says people can prevent infections that can lead to sepsis by cleaning scrapes and wounds, and practicing good hygiene, such as regular bathing and hand washing.

    Read more: http://www.cnn.com/2016/06/09/health/muhammad-ali-parkinsons-sepsis/index.html