• Marcelo David, Omer Amran, Aviad Peretz, Aviad Raviv, and Francisco Pracca.
• Department of Electrical Engineering, Jerusalem College of Technology - Lev Academic Center, HaVaad HaLeumi 21, 9372115, Jerusalem, Israel. marcelod@g.jct.ac.il.
• J Clin Monit Comput. 2020 Dec 1; 34 (6): 120912141209-1214.

AbstractThis 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.

9 keywords...

hide…