Influence of the closed suction tube on mechanical ventilation of infants′ end expiratory PETCO2

Objective To explore the influence of closed suction tube on end-tidal carbon dioxide partial pressure (PETCO2) in infants with mechanical ventilation mass ≤10 kg. Methods The study investigated 78 infants with mechanical ventilation of nasal trachea cannula and the closed suction tube was used with constant respirator parameters. Since PETCO2 was continuously monitored for 2 hours before and after the use of closed suction tube, the vital signs and PETCO2 were recorded at every 10 minutes. Results The body temperature, heart rate, breath, systolic pressure, diastolic pressure, and oxygen saturation remained stable before and after the use of closed suction tube. After 60 minutes of using closed suction tube, PETCO2 increased to (41.96±10.90)mmHg (t=-2.914, P<0.05). Conclusions PETCO2 is likely to increase after using closed suction tube for a long time in infants with mechanical ventilation mass ≤10 kg. Key words: Mechanical ventilation; Closed suction tube; Infants; End-tidal carbon dioxide partial pressure