closed circuit method

closed cir·cuit meth·od

a method for measuring oxygen consumption in which the subject rebreathes an initial quantity of oxygen through a carbon dioxide absorber and the decrease in the volume of oxygen being rebreathed is noted.
References in periodicals archive ?
IRV was considered a closed circuit method for raising mean airway pressure and arterial blood gases, and as emphasized by Lachmann (an early "open lung" advocate), it was imperative not to allow the lung to collapse during the relatively brief expiratory phase.