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Point-of-Care ultrasonography can help differentiate cardiac from pulmonary causes of dyspnea. This study found that inferior vena cava B-mode diameter during inspiration of greater than 9 mm predicted dyspnea of cardiac origin with a sensitivity of 84.4% and a specificity of 92.9% Am J Emerg Med. 2014 Dec 26. pii: S0735-6757(14)00934-6.    (retrieved Jan, 2015). There are currently 1090 pearls in the database. While every attempt has been made to ensure accuracy, mistakes can and do occur. Use databank at your own risk. All pearls © 2024 by the Internet Medical Association. Click Here to view more medical pearls.