It would have been important to know the difference in PaCO2 between the baseline and after experimentation rather than just knowing the difference at the end of the experiment. We have no information regarding the airway resistance, compliance, or peak airway pressure, which could help us for a better interpretation. Secondly, there is insufficient information on the baseline of mechanical ventilation in both situations, which may influences our interpretation of higher pCO2 levels. We have not been provided with any information in regards to these well known consequences, as well as whether or not any attempt was made to measure such complications. However, some major considerations and questions should be taken into consideration for the definitive clinical implications of their results.įirstly, clinical consequences of the removal of HME for 15 minutes without compensatory use of another artificial humidification may lead to serious implications, such as cilia and endothelial injury, increase in airway resistance, hypothermia, and etc. They reported that PaCO2 was significantly influenced by HME and the difference was correlated with weight (P < 0.001) and age (P = 0.002) of a patient. We would like to congratulate the authors on their original hypothesis and results, which have clinical crucial implications. On this issue, Kwon analyzed the effects of HME on dead space in 20 relatively healthy paediatric patients, during their exposure to general anaesthesia for minor surgical procedures. Smaller HME appears to be preferable, but there is a lack of information regarding their applicability and suitability in paediatric population. We know that Heated Moisture Exchanger (HME) may lead to larger dead space and can negatively impact mechanical ventilation and gas exchange. Pulmonary dead space under general paediatric anaesthesia is a useful and relevant parameter.
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