Effects of Sedation and/or Sedation/Analgesic Drugs Administered during Central Venous Catheterization on the Level of End-tidal Carbon Dioxide Measured by Nasal Cannula in Our PICU

摘要

Aims and objectives: Sedatives and analgesics are commonly used in pediatric intensive care units during minor invasive procedures. Here, we aimed to measure the changes in end-tidal carbon dioxide (EtCOsub2/sub) levels with different sedation/analgesic drug administrations (midazolam, ketamine, midazolam + ketamine/fentanyl) during central venous catheterization. Materials and methods: This prospective study included 44 patients who needed sedation/analgesia for central venous catheterization. Patients were sedated with midazolam, ketamine, or midazolam + fentanyl/ketamine. End-tidal carbon dioxide values were measured before and after sedation–analgesia with nasal cannula and recorded from the capnograph. Oxygen saturation (SOsub2/sub) was monitored by pulse oximetry. Whether respiratory depression occurred during the process was recorded. Results: During the procedure, 15 (34%) patients were given 0.1 mg/kg dose of midazolam described as group I, 18 (41%) patients were given 1 mg/kg dose of ketamine only described as group II, and 11 (25%) patients who could not be effective sedated with a single sedative–analgesic agent were given either 1 mg/kg dose of ketamine or 2 μg/kg dose of fentanyl together with 0.1 mg/kg dose of midazolam described as group III. According to our findings, hypoxia (54.5%) and hypercarbia (45.5%) were detected higher in group III but it was not statistically significant (p = 0.255, p = 0.364). Hypercarbia was detected in 29.5% patients, in 62% of these patients hypercarbia was accompanied by hypoxia, and 38% had only hypercarbia. When presedation and postsedation EtCOsub2/sub values were compared, we detected a statistically significant difference in all groups. Conclusion: We detected hypercarbia unaccompanied by hypoxemia in 38% patients. And we think that we have identified these patients early due to measurement of EtCOsub2/sub by nasal cannula. This study demonstrated that EtCOsub2/sub monitoring via nasal cannula is a feasible and practical way to follow ventilation during sedation/analgesia.