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- Title
Non-invasive indirect monitoring of intra-abdominal pressure using microwave reflectometry: system design and proof-of-concept clinical trial.
- Authors
David, Marcelo; Raviv, Aviad; Guttel, Ariel; García Reyes, Valentina; Simini, Franco; Pracca, Francisco
- Abstract
Monitoring 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.
- Subjects
MICROWAVE reflectometry; INTRA-abdominal pressure; EXPERIMENTAL design; SYSTEMS design; INTRA-abdominal hypertension
- Publication
Journal of Clinical Monitoring & Computing, 2021, Vol 35, Issue 6, p1437
- ISSN
1387-1307
- Publication type
Article
- DOI
10.1007/s10877-020-00605-9