Isolated Left Atrial Cardiac Tamponade Caused by Pleural Effusion.

A localized left atrial tamponade caused by left side pleural effusion is a rare finding that leads to hemodynamic instability. Here, we describe left atrial systolic and diastolic collapse resulting from left pleural effusion. An increase in intrapleural pressure by a pleural effusion can compress the pericardial space and lead to impaired cardiac filling and tamponade physiology. Here, we present a case of a 79-year old African American female who presented with shortness of breath and dry cough for a duration of one week. Chest radiograph and CT scan of the chest showed left pleural effusion. The echocardiogram revealed left atrial systolic and diastolic collapse due to pleural effusion, which triggered cardiac tamponade physiology. With the guidance of a bedside thoracic ultrasound, she underwent a diagnostic and therapeutic thoracentesis which resolved her symptoms. Repeat echocardiogram revealed resolution of the cardiac tamponade with no further indication of left atrial diastolic collapse. In conclusion, pleural effusions can cause tamponade physiology and can be resolved by thoracentesis. Early recognition by a bedside point-of-care ultrasound may help provide prompt relief of tamponade.