Point-of-care lung ultrasound supports bedside assessment of respiratory and thoracic conditions across adult care. Updated guidance in Intensive Care Medicine revisits the 2012 international PoCLUS recommendations after an expanded evidence base. The focused update concentrates on PoCLUS as a standalone clinical tool, while recognising that bedside decisions also rely on other ultrasound examinations, clinical findings, laboratory data and radiological information. The guidance aims to support more consistent use of lung ultrasound in diagnosis, monitoring and follow-up. It does not cover training, accreditation, procedural use, paediatric practice, COVID-19-specific protocols, artificial intelligence, machine learning or ultrasound physics.
Focused Scope for Adult Bedside Practice
The updated recommendations set out practical guidance for adult patients rather than a broad framework for all ultrasound practice. The scope centres on bedside lung assessment and avoids overlap with areas already addressed elsewhere, including multiorgan ultrasound protocols, perioperative use and education. This narrower focus gives clinicians a clearer structure for using PoCLUS in everyday practice, particularly when rapid assessment is needed at the bedside.
The process followed a Delphi-based consensus model, with expert discussion, anonymous voting and repeated refinement of statements where needed. Experts were selected according to predefined criteria related to scientific work and experience in clinical PoCLUS. The final output includes 83 statements grouped into seven domains. These domains cover general ultrasound signs, pneumothorax, interstitial syndrome, lung consolidations, pleural effusion, monitoring, prognosis and mixed clinical applications.
The guidance also defines important limits. PoCLUS is treated as a clinical method used by personnel directly caring for patients, not as a replacement for broader imaging or specialist morphological ultrasound. The update recognises that lung ultrasound has strong value at the bedside, but its findings still need to be interpreted in the clinical context, particularly when other investigations are needed to confirm or clarify complex presentations.
Key Signs Gain Clearer Definitions
The recommendations focus on elementary lung ultrasound signs rather than trying to define a fully normal lung image. A regular pleural line with A-lines and lung sliding reflects preserved aeration near the pleural surface, but it does not necessarily confirm normal lung structure or function. This distinction matters because PoCLUS does not directly visualise most of the lung parenchyma. Its clinical value depends on recognising patterns, distribution and changes across different chest regions.
Must Read: Expanding Role of Lung Ultrasound
Several signs receive clearer wording. B-lines remain central to the assessment of interstitial syndrome and pulmonary congestion. Lung sliding refers to pleural line movement that occurs with respiration. Lung point marks the boundary between a pneumothorax pattern and aerated lung still in contact with the chest wall. Hydropoint applies when pneumothorax and pleural effusion coexist. Lung pulse describes pulsating movement transmitted from the heartbeat to the pleural line.
For pneumothorax, the approach combines absence of movement signs with absence of lung aeration signs. In a supine patient, scanning begins in the least dependent chest areas and may extend laterally to search for lung point. When lung point is visible, pneumothorax can be confirmed with high certainty. In very large or complex cases, additional imaging may be needed. In extreme instability, ultrasound findings can support immediate drainage when pneumothorax is strongly suspected.
Monitoring Becomes a Stronger Clinical Theme
The update places significant emphasis on monitoring, not only initial diagnosis. Semi-quantitative lung ultrasound scores are considered most reliable when used to track change over time. By contrast, fixed thresholds for prognosis, disease subtypes or treatment response remain variable and still require further investigation. This distinction helps prevent overuse of numerical cut-offs where evidence is not yet sufficient for routine clinical decisions.
In cardiogenic pulmonary oedema, B-lines and the number of affected zones relate to the burden of pulmonary congestion. Repeated assessment can help monitor decongestion. In acute care, absence of B-lines indicates tolerance to fluid administration, but it does not show whether a patient will respond to fluid. During a fluid challenge, new B-lines may indicate possible pulmonary oedema, making ongoing ultrasound assessment important.
The recommendations also address heart failure, haemodialysis, lung aeration, pleural effusion and lung consolidations. In haemodialysis patients, B-line assessment can monitor pulmonary congestion and detect asymptomatic congestion. In acute and chronic heart failure, semi-quantitative assessment has prognostic value and may contribute to treatment optimisation. Lung aeration scoring can follow changes in conditions such as acute pulmonary oedema, acute respiratory distress syndrome and pneumonia. For pleural effusion, ultrasound helps distinguish fluid from consolidation and is more accurate than supine chest radiography for detecting significant effusion.
The updated PoCLUS recommendations strengthen the role of bedside lung ultrasound in adult clinical practice while keeping its scope clearly defined. The guidance supports consistent assessment of key signs, more structured diagnosis of common thoracic conditions and broader use of monitoring in acute and chronic care. It also draws attention to current limitations, especially where thresholds and prognostic categories remain under investigation. The result is a practical framework for using PoCLUS as a bedside clinical method, aligned with the 2012 recommendations but adapted to a larger and more mature evidence base.
Source: Intensive Care Medicine
Image Credit: iStock
