Relationship Between Body Posture and Lung Fluid Volume Assessed Using a Novel Noninvasive Remote Dielectric Sensing System

Author: Teruhiko Imamura1, Masakazu Hori1, Takatoshi Koi1, Takuya Fukui1, Akira Oshima1, Hayato Fujioka1, Yohei Ueno1, Hiroshi Onoda1, Shuhei Tanaka1, Nobuyuki Fukuda1, Hiroshi Ueno1, Koichiro Kinugawa1
Affiliation: <sup>1</sup> Second Department of Internal Medicine, Toyama University Toyama Japan.
Conference/Journal: Circ Rep
Date published: 2021 Dec 3
Other: Volume ID: 4 , Issue ID: 1 , Pages: 25-28 , Special Notes: doi: 10.1253/circrep.CR-21-0130. , Word Count: 141

Background: The relationship between body posture and lung fluid level has not been quantified thus far. Remote dielectric sensing (ReDSTM) is a recently introduced non-invasive electromagnetic-based technology to quantify lung fluid percentage. Methods and Results: ReDS values were measured at different body postures (i.e., sitting, supine, and supine with legs elevated) in a healthy volunteer cohort (n=16; median age 39 years, 69% men, median [interquartile range {IQR}] body mass index 23.3 kg/m2 [21.0-26.2 kg/m2]). In the sitting position, the median ReDS value was 27% (IQR 25-29%). The ReDS value increased significantly in the supine position (median 28%; IQR 27-30%; P=0.009), and increased further upon leg elevation (median 29%; IQR 28-32%; P=0.001). Conclusions: In this proof-of-concept study, the relationship between body posture and lung fluid level was quantitatively validated in a healthy cohort.

Keywords: Congestion; Heart failure; Hemodynamics.

PMID: 35083385 PMCID: PMC8710642 DOI: 10.1253/circrep.CR-21-0130