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  Indian J Med Microbiol
 

Figure 2: Modification of incentive spirometer using an endotracheal tube and an angle piece. An oxygen tubing can be connected to etCO2port of angle piece if hypoxia is a concern

Figure 2:  Modification of incentive spirometer using an endotracheal tube and an angle piece. An oxygen tubing can be connected to etCO<sub>2</sub>port of angle piece if hypoxia is a concern