The use of lung ultrasound in acute medicine

POCUS (Point of Care Ultrasound) refers to ultrasound performed by clinicians as part of their initial patient evaluation, often with the aim of answering a specific question as opposed to being a comprehensive assessment. Such ultrasound is noninvasive, involves no radiation and can be rapidly performed at the bedside. It is also widely practiced in emergency and intensive care medicine leading to earlier and more accurate diagnoses for a wide range of presentations such as shock, renal failure and dyspnoea. POCUS has evolved from cardiological or radiological studies, reduced in complexity and scoped for clinician use. Lung ultrasound (LUS) has been largely developed by acute care clinicians and is a more recent addition to POCUS. Procedural LUS is widely recommended to improve the safety profile of pleural catheter placement (referring to BTS guidelines) but in the UK diagnostic LUS is not widely practiced despite good evidence and guideline support for its use. In this article we briefly review and describe the role of diagnostic LUS as applied to acute medicine. Potential advantages of LUS include a decreased time to diagnosis, improved diagnostic accuracy, a reduction in radiation exposure and unnecessary expensive tests. Studies have shown that at least one diagnosis was missed in around a fifth of patients with acute respiratory symptoms, resulting in increased length of stay and mortality in a third of patients.