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ICU TopicsMonitoring / ultrasound

ICU · Monitoring / ultrasound

Point-of-Care Ultrasound (POCUS) — Lung, Abdominal & Vascular

Also known as Point-of-care ultrasound · POCUS · Lung ultrasound · B-lines · FAST · eFAST · RUSH protocol · BLUE protocol · Compression ultrasonography · Lung point · Lung sliding

Point-of-care ultrasound (POCUS) is the clinician-performed, bedside ultrasound that answers specific clinical questions in real time, across three areas. Lung ultrasound: A-lines (normal), B-lines (interstitial syndrome — pulmonary oedema, ARDS, pneumonia), absent lung sliding (pneumothorax), the lung point (confirms pneumothorax), and the BLUE protocol for acute respiratory failure. Abdominal ultrasound: the FAST/eFAST (free fluid in trauma — Morison's pouch, splenorenal, pelvis, pericardium) and the non-trauma abdominal scan (AAA, gallbladder, hydronephrosis). Vascular ultrasound: compression ultrasonography for DVT (a non-compressible vein is a thrombus), ultrasound-guided line insertion, and AAA screening. POCUS integrates with the RUSH protocol (cardiac, lung, abdominal, vascular) for the bedside diagnosis of shock.

high21 referencesUpdated 20 Aug 202644 min readVerification in progress

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Point-of-care ultrasound (POCUS) is the clinician-performed, bedside ultrasound that answers a focused question in real time, across three domains. Lung: an artefact vocabulary — A-lines (normal), B-lines (interstitial syndrome), lung sliding (present means no pneumothorax), the lung point (confirms pneumothorax), consolidation, effusion — read through the BLUE protocol to diagnose acute respiratory failure (A-profile plus a leg clot is pulmonary embolism; B-profile is oedema; A/B or A-plus-PLAPS is pneumonia; a naked A is asthma or COPD). Abdominal: the FAST/eFAST for free fluid in trauma (the pelvis is the most sensitive view for small volumes — Morison's pouch needs several hundred millilitres before it turns positive) and the non-trauma scan for AAA, gallbladder, and hydronephrosis. Vascular: compression ultrasonography for DVT (a non-compressible vein is a thrombus — 93.8 per cent sensitive and 97.8 per cent specific for proximal DVT), ultrasound-guided line insertion, and AAA screening. POCUS integrates with the RUSH protocol (cardiac, lung, abdominal, vascular) for the bedside diagnosis of shock.[1][14][18]

Meet the patient

A 68-year-old man reaches the resus bay at 4am, breathless and clammy, saturating 84 per cent on 15 litres, respiratory rate 34, blood pressure 96 over 58. He has ischaemic cardiomyopathy with an ejection fraction of 30 per cent, severe COPD, and flew home from London three weeks ago. The chest X-ray shows bilateral infiltrates that no one trusts.[1]

The question that decides his next ten minutes is the one the BLUE protocol was built to answer: why is this lung failing? Is it wet with oedema, dry with a clot, consolidating with pneumonia, or simply wheezy and overdistended? Lung ultrasound plus a venous scan resolves it faster than the history, examination, CXR, and blood gas combined.[1]

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References21ShowHide
  1. [1]Lichtenstein DA, Mezière GA. Relevance of lung ultrasound in the diagnosis of acute respiratory failure: the BLUE protocol Chest, 2008.PMID 18403664
  2. [2]Volpicelli G, Elbarbary M, Blaivas M, et al. International evidence-based recommendations for point-of-care lung ultrasound Intensive Care Med, 2012.PMID 22392031
  3. [3]Lichtenstein DA, Mezière GA, Lagoueyte JF, Biderman P, Goldstein I, Gepner A. A-lines and B-lines: lung ultrasound as a bedside tool for predicting pulmonary artery occlusion pressure in the critically ill Chest, 2009.PMID 19809049
  4. [4]Lichtenstein DA. The lung point, still a sign specific to pneumothorax Intensive Care Med, 2019.PMID 31399778
  5. [5]Quinn AC, Sinert R. What is the utility of the Focused Assessment with Sonography in Trauma (FAST) exam in penetrating torso trauma? Injury, 2011.PMID 20701908
  6. [6]Trowbridge RL, Rutkowski NK, Shojania KG. Does this patient have acute cholecystitis? JAMA, 2003.PMID 12503981
  7. [7]Ashton HA, Buxton MJ, Day NE, et al. The Multicentre Aneurysm Screening Study (MASS) into the effect of abdominal aortic aneurysm screening on mortality in men: a randomised controlled trial Lancet, 2002.PMID 12443589
  8. [8]Randolph AG, Cook DJ, Gonzales CA, Pribble CG. Ultrasound guidance for placement of central venous catheters: a meta-analysis of the literature Crit Care Med, 1996.PMID 8968276
  9. [9]Airapetian N, Maizel J, Alyamani O, et al. Does inferior vena cava respiratory variability predict fluid responsiveness in spontaneously breathing patients? Crit Care, 2015.PMID 26563768
  10. [10]Lichtenstein DA. Fluid administration limited by lung sonography: the place of lung ultrasound in assessment of acute circulatory failure (the FALLS-protocol) Expert Rev Respir Med, 2012.PMID 22455488
  11. [11]Hasani SA, Fathi M, Daadpey M, et al. Accuracy of bedside emergency physician performed ultrasound in diagnosing different causes of acute abdominal pain: a prospective study Clin Imaging, 2015.PMID 25667065
  12. [12]Reissig A, Copetti R Lung ultrasound in community-acquired pneumonia and in interstitial lung diseases Respiration, 2014.PMID 24481027
  13. [13]Blanco P, Volpicelli G Common pitfalls in point-of-care ultrasound: a practical guide for emergency and critical care physicians Crit Ultrasound J, 2016.PMID 27783380
  14. [14]Goodacre S, Sampson F, Thomas S, van Beek E, Sutton A. Systematic review and meta-analysis of the diagnostic accuracy of ultrasonography for deep vein thrombosis BMC Med Imaging, 2005.PMID 16202135
  15. [15]Bernardi E, Camporese G, Büller HR, et al. Serial 2-point ultrasonography plus D-dimer vs whole-leg color-coded Doppler ultrasonography for diagnosing suspected symptomatic deep vein thrombosis: a randomized controlled trial JAMA, 2008.PMID 18840838
  16. [16]Sevestre MA, Labarère J, Casez P, et al. Outcomes for inpatients with normal findings on whole-leg ultrasonography: a prospective study Am J Med, 2010.PMID 20103025
  17. [17]Monnet X, Marik P, Teboul JL. Passive leg raising for predicting fluid responsiveness: a systematic review and meta-analysis Intensive Care Med, 2016.PMID 26825952
  18. [18]Branney SW, Wolfe RE, Moore EE, et al. Quantitative sensitivity of ultrasound in detecting free intraperitoneal fluid J Trauma, 1995.PMID 7674411
  19. [19]Paajanen H, Lahti P, Nordback I. Sensitivity of transabdominal ultrasonography in detection of intraperitoneal fluid in humans Eur Radiol, 1999.PMID 10460387
  20. [20]Von Kuenssberg Jehle D, Stiller G, Wagner D. Sensitivity in detecting free intraperitoneal fluid with the pelvic views of the FAST exam Am J Emerg Med, 2003.PMID 14574655
  21. [21]Monnet X, Marik PE, Teboul JL. Prediction of fluid responsiveness: an update Ann Intensive Care, 2016.PMID 27858374

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