• Marcelo David, Aviad Raviv, Ariel Guttel, Valentina García Reyes, Franco Simini, and Francisco Pracca.
• Department of Electrical Engineering, Jerusalem College of Technology - Lev Academic Center, Jerusalem, Israel. marcelod@jct.ac.il.
• J Clin Monit Comput. 2021 Dec 1; 35 (6): 1437-1443.

AbstractMonitoring intra-abdominal pressure (IAP) has become a standard in intensive care units. Correlation between the abdominal wall's thickness (AWTh) and IAP has been reported previously. The abdominal wall can be modeled as a compound of parallel dielectric slabs; changes in their width have a direct effect on the reflection coefficient of the abdominal wall at microwave frequencies. This work describes the design of a reflectometry system and its proof-of-concept trial on five patients during laparoscopic surgery. The system complies with IEEE Std. C95.1-2005 concerning exposure of humans to microwave electromagnetic fields in controlled environments. The results putatively show an inverse correlation between IAP and the reflection coefficient, and a strong dependence on the body mass index. A better understanding of the dynamics in the changes of the AWTh (during intra-abdominal hypertension) will allow further development of a microwave-based technique for the continuous non-invasive indirect monitoring of IAP in critical patients.© 2020. Springer Nature B.V.

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