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In page Chest drainage:
"Drainage of the pericardium can be achieved by puncture (transcutaneously) or surgically. In the first case, small-bore catheters not suitable for the drainage of blood (e.g. hemopericard) are used. Pericardial drains are mostly used with the help of gravity. As a pericardial drain is placed surgically, a largo bore drain is used with a decreased probability of clogging.[citation needed]
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