IV set with filter for pt with PFO

[seks]

Today was the first time I came across a pt that requires me to use the following for the Baxter IV pump:

Extension Set with 0.22 micron high pressure extended life filter and 1 INTERLINK injection site 6" from male Luer lock adapter

http://www.ecomm.baxter.com/ecatalog/browseCatalog.do?lid=10001&hid=10001&cid=10016&key=10c55e55db25fd594c79724ed21073db&pid=459154

The pt has patent foramen ovale (PFO).

My understanding is is that people with PFO have a higher risks of stroke and TIA. But I am not sure why a filter needs to be in the IV tubing somewhere for people with PFO? Are there particles in IV fluids/meds that would cause stroke and TIA???

[iluvivt, BSN, RN]

It is to prevent an A (air embolism) . One feature of a.22 micron filter is to eliminate air. By trapping the air in the filter you can potentially prevent any air getting into the left a trim and embolization into the circulation.