Electronic Barostat System

A polyethylene bag in the rectum is fixed to a multilumen tube, which is connected to a baro-stat device. The pressure in the bag is measured via a separate lumen of the tube. The barostat is connected to a computer, where the pressure, volume, and compliance (mL/mmHg) are constantly monitored and recorded as the pressure-volume curve.

The bag can be distended in steps to either a fixed pressure (isobaric) or a fixed volume (iso-volumetric). It is also able to keep the pressure in the rectal beg at a preselected level, which means that when the rectum relaxes, the system injects air, and when it contracts, the barostat

Figure 10.4. Manovolumetry. An example of rectal volume and anal pressure response to rectal distention with a preset distention pressure. A steady rate is accomplished within 60 seconds. (Modified from Akervall et al,23 with permission of Springer.)

Figure 10.4. Manovolumetry. An example of rectal volume and anal pressure response to rectal distention with a preset distention pressure. A steady rate is accomplished within 60 seconds. (Modified from Akervall et al,23 with permission of Springer.)

aspirates air. Thus, the barostat can measure rectal motor activity as changes in the intrarec-tal volume at a constant intrarectal pressure.20'21

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