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Invasive cardiopulmonary exercise test
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== Differences from a cardiopulmonary exercise test == An invasive CPET differs from a non-invasive CPET in that two catheters (thin tubes) are inserted into veins and kept in place during the exercise test to provide additional information, and may be used to withdraw some blood. One catheter is placed in a large vein, usually in the arm, neck or below the collarbone, and used to take measurement from the pulmonary artery by using the tube to pass a balloon down the artery,<ref name="hopkinsmedicine">{{Cite web | url = https://www.hopkinsmedicine.org/health/treatment-tests-and-therapies/pulmonary-artery-catheterization | title = Pulmonary Artery Catheterization | last = | first = | authorlink = | date = | website = Johns Hopkins Medicine|language=en|archive-url=|archive-date=|url-status=|access-date=2020-09-21}}</ref> and a second catheter is placed in the radial artery of one arm.<ref name="Maron2013" /> This adds additional risks compared to a noninvasive CPET.<ref name="hopkinsmedicine" />
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