Fig. 1

Assessment of Lung Collapse Score. The degree of lung collapse during one-lung ventilation was evaluated by measuring the Lung Collapse Score (Lung Collapse Score), evaluating the lung volume and the lung surface color. The upper panel shows a lung volume evaluation. In the distant view, with the video directed to the upper edge of the thoracic cavity, both the upper edge of the thoracic cavity and vertebral bodies are visible. The lung volume shown here is determined as 2. The lower panel shows a lung surface color evaluation. In this panel, as the white areas occupy between one-third and two-thirds of the lung surface, the color score is determined as 2