The account alleges that during a left atrial appendage [laa] closure procedure, pericardial effusion was observed.The physician had acquired an anteroposterior projection and under fluoroscopic guidance the catheter was inserted, and advanced into the right atrium to mark the location of the aortic valve.The tip of the sheath was then positioned at the patient's fossa ovalis and the transseptal wall was punctured for left atrial access.After successfully puncturing the patient's septum, the patient became hemodynamically unstable.The physician then successfully performed a pericardiocentesis draining 120ml of blood from the patient's pericardium.The patient's status improved an hour later and the patient was then transferred to the recovery unit.
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