“…By placing a closed chest drainage tube, it can achieve the effects of draining gas and fluids from the chest cavity, promoting lung expansion, preventing chest infections, and rebuilding negative pressure [27,28]. Meanwhile, by observing the amount, characteristics of drainages, and the fluctuation of the water column, some abnormal conditions can be found and treated in time [29]. At present, it is common that SCD is placed after lobectomy of upper lung tissue in China, while DCD are placed after lobectomy of lower lung tissue [14].…”