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Quick technical question, is there any danger in using a 5fr pacer in a 8.5fr cortis? The reason I ask is that currently most of the cortises (percutaneous sheath inducer catheters) on our unit are 6fr which means that no triple lumen and no swan. One nurse that works is ICU at our hospital says that there is a danger of air embolus in using the 8.5 and a 5fr pacer, and I disagree but have no facts.