What is the role of manometry in bladder pressure assessment?

Updated: Jan 16, 2020
  • Author: Pamela I Ellsworth, MD; Chief Editor: Bradley Fields Schwartz, DO, FACS  more...
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Answer

Manometry is one of the original methods used to measure bladder pressure via a Foley catheter. [22] The formal technique involves placement of a manometry tube between the Foley catheter and the drainage bag. A priming volume of fluid must be infused into the bladder to ensure adequate volume to fill the Foley and the manometry tube until equilibrium is reached. The tube must be vented to ambient air pressure. In addition, it requires proper positioning of the zero point, the angle of the manometer, and avoidance of Foley kinking for accuracy.

A limitation of this technique is the need for repeat breaking of the closed system (Foley-drainage bag seal) every time a pressure reading is to be obtained. The vented manometry tube must also be reassembled, which takes time and introduces the risk of infection. In addition, the pressure measurement is in centimeters of water and must be converted to mm Hg (divided by 1.36) to follow current recommendations for management of intra-abdominal compartment syndrome (IACS), which increases the risk of possible miscalculations.


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