- The removal of fluid from a body cavity using a needle, trocar, cannula, or other hollow instrument. A paracentesis may be diagnostic or therapeutic as, for example, in ascites where there is free fluid in the abdominal (peritoneal) cavity. If the cause of the ascites is uncertain, diagnostic paracentesis is done in order to obtain fluid to examine. Therapeutic paracentesis may then be done to remove more fluid, as part of the plan of treatment. Paracentesis of the chest cavity is called a thoracentesis.
* * *The passage into a cavity of a trocar and cannula, needle, or other hollow instrument for the purpose of removing fluid; variously designated according to the cavity punctured. SYN: tapping (2). [G. parakentesis, a tapping for dropsy, fr. para, beside, + kentesis, puncture]
* * *para·cen·te·sis .par-ə-(.)sen-'tē-səs n, pl -te·ses -.sēz a surgical puncture of a bodily cavity (as of the abdomen) with a trocar, aspirator, or other instrument usu. to draw off an abnormal effusion for diagnostic or therapeutic purposes
* * *n.tapping: the process of drawing off fluid from a part of the body through a hollow needle or cannula. In ophthalmology, it involves an incision into the anterior chamber of the eye.
* * *para·cen·te·sis (par″ə-sen-teґsis) [para- + -centesis] surgical puncture of a cavity with a needle or other hollow instrument for diagnostic or therapeutic aspiration of fluid. paracentetic adj
Medical dictionary. 2011.