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The Bedside Lung Ultrasound in Emergency (BLUE) protocol demonstrated that structured lung ultrasonography can help differentiate major causes of acute respiratory failure. In a cohort of patients with acute dyspnea, combinations of A-lines, B-lines, lung sliding, consolidation and venous findings were used to generate diagnostic profiles. The study showed high sensitivity and specificity for several common causes, including pulmonary edema, asthma or COPD and pneumothorax-related patterns. For internists, the value of POCUS is that it can be performed at the bedside without ionizing radiation and repeated when the patient's condition changes. Lung ultrasound should not replace a full clinical assessment or formal imaging when indicated, but it can accelerate diagnostic reasoning and support early treatment decisions. Training needs to emphasize probe positioning, artifact recognition and integration with cardiac and vascular findings. In resource-constrained settings, the portability of ultrasound is particularly attractive. The evidence supports incorporating basic lung ultrasound into the diagnostic toolkit of acute-care physicians rather than limiting ultrasound to radiology or critical-care specialists.

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The Bedside Lung Ultrasound in Emergency (BLUE) protocol demonstrated that structured lung ultrasonography can help differentiate major causes of acute respiratory failure. In a cohort of patients with acute dyspnea, combinations of A-lines, B-lines, lung sliding, consolidation and venous findings were used to generate diagnostic profiles. The study showed high sensitivity and specificity for several common causes, including pulmonary edema, asthma or COPD and pneumothorax-related patterns. For internists, the value of POCUS is that it can be performed at the bedside without ionizing radiation and repeated when the patient's condition changes. Lung ultrasound should not replace a full clinical assessment or formal imaging when indicated, but it can accelerate diagnostic reasoning and support early treatment decisions. Training needs to emphasize probe positioning, artifact recognition and integration with cardiac and vascular findings. In resource-constrained settings, the portability of ultrasound is particularly attractive. The evidence supports incorporating basic lung ultrasound into the diagnostic toolkit of acute-care physicians rather than limiting ultrasound to radiology or critical-care specialists.
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