• Kamran Mahmood, Scott L Shofer, Barry K Moser, A Christine Argento, Emily C Smathers, and Momen M Wahidi.
• 1 Division of Pulmonary, Allergy, and Critical Care Medicine, Department of Medicine, and.
• Ann Am Thorac Soc. 2014 Jan 1; 11 (1): 73-9.

RationaleClopidogrel is a commonly used antiplatelet medication. The risk of local hemorrhage associated with use of this drug during routine thoracentesis or small-bore chest tube placement is not well established.ObjectivesWe conducted a prospective cohort study to assess the risk of hemothorax in patients taking clopidogrel while undergoing either pleural procedure.MethodsTwenty-five consecutive adult patients who were taking clopidogrel at the time they were offered thoracentesis or small-bore (14 Fr) chest tube placement consented to continue taking the drug through their procedure. A control group consisted of 50 patients undergoing these pleural procedures who were not taking clopidogrel at the time they consented to undergo either procedure. All of the pleural procedures were performed under ultrasound guidance by an interventional pulmonologist or a fellow under direct faculty supervision. Hospitalized patients were screened for hemothorax by observing for a post-procedure drop in blood hemoglobin content of 2 g/dl or reaccumulation of their pleural effusion within 24 hours of the procedure. Outpatients were called within 2 weeks after their procedure to determine whether they had any symptoms suggestive of hemothorax.Measurements And Main ResultsThere was one case of hemothorax after thoracentesis in the clopidogrel group versus none in the control group. The one patient with hemothorax required transfusion with 2 units of packed red blood cells and small-bore chest tube placement, and clopidogrel was withheld. There were no other clinically apparent complications of either procedure.ConclusionsConsidered in combination with other small previously published studies, this single-center, nonrandomized, controlled prospective cohort study suggests that the rate of clinically consequential hemorrhage after ultrasound-guided thoracentesis or chest tube placement in patients taking clopidogrel is sufficiently low to warrant a large, randomized clinical trial designed to determine the safety of performing these procedures without interrupting clopidogrel therapy.

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