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Diagnostic accuracy of basic lung ultrasound in breathless patients over 60 years of age; stressing the protocol.
Australasian Journal of Ultrasound in Medicine 2013 November
Introduction: Emergency department differentiation of pulmonary oedema from chronic obstructive airways disease causing acute breathlessness is inaccurate 25% of the time despite clinical acumen, clinician-reported chest x-ray and ECG. This research investigates whether a basic lung ultrasound protocol (LUS) could improve identification of pulmonary oedema in breathless elderly patients. Method: Researchers prospectively sampled patients over 60 years, describing any breathlessness on presentation to a suburban emergency department. LUS studies were acquired by experienced or novice sonologists, interpreted by a blinded reviewer and compared with cardiologist chart audit for diagnosis at admission (gold standard). The admitting doctor's diagnosis, blinded to LUS, was compared with the chart audit result. Results: 204 LUS were collected, 145 by experienced sonologist and 59 by inexperienced. Diagnostic accuracy compared to cardiologist audit was 86.2% (95% CI 80.9 to 90.3), significantly higher than 70.2%, diagnostic accuracy for admission diagnosis, difference in proportion of 16% (95%CI 7.7 to 24.4%). Conclusion: A simple lung scanning protocol can help exclude pulmonary oedema in any breathless elderly patient.
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