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May 7, 2013

Anti-depressant link to Clostridium difficile infection

Certain types of anti-depressants have been linked to an increase in the risk of Clostridium difficile infection (CDI) finds a study in BioMed Central's open access journal BMC Medicine. Awareness of this link should improve identification and early treatment of CDI.

CDI is one of the most common hospital acquired infections and is responsible for more than 7000 deaths annually in the USA alone. Several types of medications are thought to increase risk of CDI, including anti-depressants, and given that depression is the third most common medical condition worldwide a team from the University of Michigan investigated the exact nature of this risk.

Firstly the team studied Clostridium difficile infection in people with and without depression and found that people with major depression had a much higher chance of CDI (a 36% increase) than people without depression. This association held for a variety of depressive disorders and nervous or psychiatric problems. Age and family support also impacted risk of CDI. Older, widowed Americans were 54% more likely to catch C. difficile than their married peers. Just living alone increased risk by 25%.

Secondly they looked to see if there was an association between antidepressant medication and hospital acquired CDI. They found that use of most types of antidepressants did not affect CDI risk -- out of the twelve drugs tested only mirtazapine and fluoxetine increased risk of CDI, in each case the risk was doubled.

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