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A 59-year-old man with a history of atrial fibrillation presented to the emergency department with several days of progressive dyspnea and three episodes of syncope. On physical examination, blood pressure was 154/124 mm Hg, pulse 149 beats/min, respiratory rate 28 breaths/min, and oxygen saturation 83% on room air. He was diaphoretic (but speaking fluently), had clear lungs, a rapid, irregular heartbeat without murmurs, and bilateral lower extremity edema. An electrocardiogram confirmed atrial fibrillation with rapid ventricular response, and a clinical ultrasound demonstrated no pericardial effusion, a moderately decreased left ventricular ejection fraction, no right ventricular (RV) strain, and a hyperechoic, mobile, serpiginous mass oscillating between the right atrium and right ventricle (Figures 1 and 2). Chest computed tomography (Figure 3) was performed to confirm the diagnosis and evaluate the extent of disease. Pulmonary embolism (PE) in transit refers to the direct visualization of distal thrombi passing through the right side of the heart. Cases with this echocardiogram finding are associated with significantly worse mortality. Recommendations are limited, but favor thrombolysis or embolectomy rather than anticoagulation alone. Although typical echocardiogram findings suggestive of PE include RV strain and McConnell’s sign (RV free wall hypokinesis with preserved apical contractility), this patient had neither of these findings, but the presence of a right-sided thrombus confirmed the likely diagnosis of PE and

Pulmonary embolism in transit: direct visualization of a PE passing through the heart using bedside ultrasonography