RT Book, Section A1 Reichman, Eric F. SR Print(0) ID 57717638 T1 Chapter 167. Tympanocentesis T2 Emergency Medicine Procedures, 2e YR 2013 FD 2013 PB The McGraw-Hill Companies PP New York, NY SN 978-0-07-161352-1 LK accessemergencymedicine.mhmedical.com/content.aspx?aid=57717638 RD 2022/08/07 AB Tympanocentesis, first described in 1768, is a diagnostic and therapeutic procedure in which a needle is inserted through the tympanic membrane to aspirate fluid from the middle ear space (Figure 167-1). The procedure is considered diagnostic when the material obtained is sent for laboratory and/or microbiological analysis. It is considered therapeutic in most instances because it relieves pressure, thereby reducing pain and many times shortens the course of an acute otitis media (AOM).