STEPHEN R. ASH, M.D.
A peripheral density on chest X ray often poses the question of pleural fluid versus parenchymal disease. Due to fluid loculation in inflammatory disease, a lateral decubitus film will not always indicate the presence of fluid. Thoracentesis done with a small needle will indicate free fluid; however, the depth of this fluid is not easily determined by probing with a small needle, and such probing is dangerous, since the lung is usually penetrated before any resistance is felt. Insertion of a large through-the-needle catheter is often done at this point, but the amount of fluid removed through this catheter does
STEPHEN R. ASH. Measurement of Thickness of Pleural Effusions Using an Impedance Probe: An Aid in Thoracentesis. Ann Intern Med. 1975;82:380–381. doi: 10.7326/0003-4819-82-3-380
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Published: Ann Intern Med. 1975;82(3):380-381.
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