Lung-to-finger circulation time can be measured stably with high reproducibility by simple breath holding method in cardiac patients

Abstract Lung to finger circulation time (LFCT) has been used to estimate cardiac function. We developed a new LFCT measurement device using a laser sensor at fingertip. We measured LFCT by measuring time from re-breathing after 20 s of breath hold to the nadir of the difference of transmitted red l...

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Bibliographic Details
Published in:	Scientific reports 2021-08, Vol.11 (1), p.15913-15913, Article 15913
Main Authors:	Tobushi, Tomoyuki, Kasai, Takatoshi, Hirose, Masayuki, Sakai, Kazuhiro, Akamatsu, Manabu, Ohsawa, Chizuru, Yoshioka, Yasuko, Suda, Shoko, Shiroshita, Nanako, Nakamura, Ryo, Kadokami, Toshiaki, Tohyama, Takeshi, Funakoshi, Kouta, Hosokawa, Kazuya, Ando, Shin-ichi
Format:	Article
Language:	eng
Subjects:	Congestive heart failure Heart failure Reproducibility
Online Access:	Get full text
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Summary:	Abstract Lung to finger circulation time (LFCT) has been used to estimate cardiac function. We developed a new LFCT measurement device using a laser sensor at fingertip. We measured LFCT by measuring time from re-breathing after 20 s of breath hold to the nadir of the difference of transmitted red light and infrared light, which corresponds to percutaneous oxygen saturation. Fifty patients with heart failure were enrolled. The intrasubject stability of the measurement was assessed by the intraclass correlation coefficient (ICC). The ICC calculated from 44 cases was 0.85 (95% confidence interval: 0.77–0.91), which means to have “Excellent reliability.” By measuring twice, at least one clear LFCT value was obtained in 89.1% of patients and the overall measurability was 95.7%. We conducted all LFCT measurements safely. High ICCs were obtained even after dividing patients according to age, cardiac index (CI); 0.85 and 0.84 (≥ 75 or
ISSN:	2045-2322 2045-2322