Exudative effusions in congestive heart failure patients usually have a non-cardiac cause. Typically, pleural effusions associated with congestive heart failure are transudates, explain investigators, but patients are occasionally found to have congestive heart failure with an exudate.
The investigators, from the Departments of Pulmonary and Critical Care Medicine and Physiology and Biophysics at the University of Oklahoma Health Sciences Center in Oklahoma City, Oklahoma, United States, studied 175 patients who underwent thoracentesis. These patients were identified from a group of 770 patients with congestive heart failure and an effusion. Eighty-six out 175 of these patients had a transudate and 89 had exudates.
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