This work describes the optimization of electrical bioimpedance measurements for indirect intra-abdominal pressure (IAP) assessment. The experimental run was performed on a female Sus scrofa domesticus (domestic pig). Different values of IAP were induced by inflation of the abdominal cavity, using a trocar placed near the umbilicus over the linea alba. The whole experiment was run within 1 h of the subject being sacrificed. The abdominal wall thickness was measured at an IAP of 5 mmHg. An exponential trend linking between the bioimpedance values at 99.8 kHz and the IAP was found. Non-optimized electrode placement presented a strongly reduced sensitivity to IAP changes above 7 mmHg. 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.
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The authors warmly thank David Kushnir, Chief Operation Officer at The Center of Innovative Surgery of Hadassah Medical Center in Jerusalem, Israel.
Support for this research was granted by the Lev Academic Center: Internal Grant 5777-8.
Conflict of interest
The authors declare no conflict of interest.
The experiment and the preparation were done according to the ethical considerations of The Center of Innovative Surgery of Hadassah Medical Center, Jerusalem, Israel, and local regulations (the strictest among them).
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David, M., Amran, O., Peretz, A. et al. Optimized electrical bioimpedance measurements of abdominal wall on a porcine model for the continuous non-invasive assessment of intra-abdominal pressure. J Clin Monit Comput 34, 1209–1214 (2020). https://doi.org/10.1007/s10877-019-00441-6
- Intra-abdominal pressure