Fast Breathing, Faster Thinking: How the Bedside Lung Ultrasound in Emergency (BLUE) Protocol Prevented a Missed Pulmonary Embolism.

Pulmonary embolism is a potentially life-threatening condition with highly variable and often misleading presentations. We report a case of a 51-year-old woman who presented with atypical symptoms, including severe back pain and mild chest discomfort, along with unexplained tachypnea on reassessment, and was ultimately diagnosed with bilateral pulmonary embolism using the bedside lung ultrasound in emergency (BLUE) protocol. Despite the absence of classic features of pulmonary embolism or deep vein thrombosis and preserved blood pressure on presentation, her marked tachypnea prompted a point-of-care ultrasound, which revealed a non-compressible femoral vein. Computed tomography pulmonary angiography confirmed bilateral pulmonary embolism. Laboratory results, which became available only after imaging, further supported the diagnosis. This case highlights the value of integrating point-of-care ultrasound into emergency care, especially in patients with atypical presentations. Ultrasound is truly the modern stethoscope of the emergency physician.