Bipolar Disorder a Risk Factor for Parkinson’s?

Struggling with bipolar disorder is hard enough, but now a new study suggests these patients are seven times more likely to develop Parkinson's disease.

But U.S. experts cautioned that the absolute risk of developing Parkinson's -- an incurable movement disease -- is still very low for those with the mood disorder.

"I wasn't surprised [by the study's findings], because similar disorders like major depression and anxiety disorder convey a similar increased risk of Parkinson's later in life," said a Dr. "This gives you two reasons to treat bipolar disorder aggressively," he added. 

Also known as manic-depressive illness, bipolar disorder is a mood disorder marked by swings from elated, energized behavior to feelings of sadness and hopelessness. It affects about 2.6% of American adults, according to the researchers.

Parkinson's is a progressive condition causing tremors, rigid muscles and slowed movement, among other symptoms. By 2030, the Parkinson's Foundation projects 1.2 million Americans will be living with the disease.

For the study, researchers  reviewed health records for 56,000 people  who were diagnosed with bipolar disorder between 2001 and 2009. They were compared to 225,000 people with no history of bipolar or Parkinson's. Both groups were tracked until late 2011.

During the study period, 372 people with bipolar disorder -- or 0.7% -- developed Parkinson's. This compared to 222 -- or 0.1% -- of those who didn't have bipolar disorder.

Those with bipolar who developed Parkinson's were nine years younger -- average age 64 -- than others who also developed Parkinson's, the study found.

"When you say there's seven times the risk, it gets scary. But it's still very few [bipolar] patients who get Parkinson's," said a Dr., who reviewed the findings. He's a neurologist specializing in movement disorders and Parkinson's disease. He pointed out that while the study was large, it was limited by including only people in Taiwan.

"We don't know how this would apply more globally or broadly," he said. "I think it's more interesting for physicians to know this and be more aware of the association."

The author said scientists have many theories -- still unproven -- about how bipolar disorder might be connected to the development of Parkinson's. 

"A depressive or manic episode may do something to the brain that renders it more vulnerable" to Parkinson's over time, he said.

And he noted that many medications used to treat bipolar disorder can trigger Parkinson's-like symptoms.

Many experts think Parkinson's is active years or decades before movement problems show up, and mood disorders such as bipolar may actually be an early symptom of Parkinson's, authors said. 

Much more research is still needed, they agreed.

"We definitely need to look more at a global population," he said. "The researchers here did follow patients for 10 years, but it needs to be extended longer to see how many of these patients convert to Parkinson's down the road."

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