Optimized electrical bioimpedance measurements of abdominal wall on a porcine model for the continuous non-invasive assessment of intra-abdominal pressure
AbstractThis work describes the optimization of electrical bioimpedance measurements for indirect intra-abdominal pressure (IAP) assessment. The experimental run was performed on a femaleSus scrofa domesticus (domestic pig). Different values of IAP were induced by inflation of the abdominal cavity, using a trocar placed near the umbilicus over thelinea alba. The whole experiment was run within 1 Â h of the subject being sacrificed. The abdominal wall thickness was measured at an IAP of 5Â mmHg. An exponential trend linking between the bioimpedance values at 99.8Â kHz and the IAP was found. Non-optimized electrode placement presented a strongly reduced sensitivity to IAP changes above 7Â mmH g. Upon optimization and placing the electrodes with a separation of about 3.6 times the measured abdominal wall thickness, the sensitivity for high IAP drastically increased, allowing continuous non-invasive monitoring of IAP, confirming the optimization method proposed in this work.
Source: Journal of Clinical Monitoring and Computing - Category: Information Technology Source Type: research
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