Radical-7

• Published in: THE JOURNAL OF JAPAN SOCIETY FOR CLINICAL ANESTHESIA Vol. 42; no. 1; pp. 36 - 43
• Main Authors: MORI, Takashi, TANAKA, Katsuaki, YAMASAKI, Hiroyuki
• Format: Journal Article
• Language: Japanese
• Published: THE JAPAN SOCIETY FOR CLINICAL ANESTHESIA 15.01.2022; 日本臨床麻酔学会
• Subjects: Dynamic index; PI; PVI; Radical-7; SpHb
• ISSN: 0285-4945; 1349-9149
• DOI: 10.2199/jjsca.42.36

Radical-7® is a multifunctional pulse oximeter from Masimo Co Ltd. Its features include high-accuracy pulse oximetry at low perfusion, accurate monitoring of respiratory rate, monitoring of oxygenation in the range of PaO2 100–200 mmHg, non-invasive measurement of the hemoglobin concentration（SpHb）, peripheral perfusion status（perfusion index）, and a dynamic hemodynamic index（Pleth Variability Index：PVI）. The PVI is useful as a dynamic index of fluid responsiveness, similar to the previously used dynamic indices, such as stroke volume variation and pulse pressure variation. Pain, respiratory status, catecholamine infusion, and different measurement sites can significantly affect the PVI. However, the PVI is less invasive than other commercially available dynamic indices. The SpHb can be used to continuously monitor hemoglobin concentration, but it is less accurate than actual measurement. However, it is useful for monitoring during the perioperative period when the risk of bleeding is high.