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Korean Journal of Anesthesiology 2002;43(4):451-456.
DOI: https://doi.org/10.4097/kjae.2002.43.4.451   
Proper Respiratory Rate during Mechanical Ventilation in Pediatric General Anesthesia.
Il Sook Seo, Yong Hwan Lee, Sae Yeon Kim
Department of Anesthesiology, College of Medicine, Yeungnam University, Daegu, Korea. isseo@med.yu.ac.kr
We experienced unintentional hyperventilation during mechanical ventilation in pediatric general anesthesia. It is very difficult to decide respiratory rate or tidal volume with a patient's condition for adequate ventilation while respiratory gas monitoring is unavailable in many cases. Therefore, we studied to find a proper respiratory rate (RR) with a fixed tidal volume during mechanical ventilation in general anesthesia.
We studied 70 children weighing 10-30 kg during general anesthesia. An endotracheal tube was selected according to 3.5+age (yrs)/4. After intubation with midazolam, thiopental sodium and succinylcholine, mechanical ventilation was applied: tidal volume 8-10 ml/kg, peak inspiratory pressure 15-20 mmHg, RR 20 (infant), 18 (under 3 yrs), 16 (under 5 yrs), 14 (above 5 yrs) breaths/min. We adjusted the RR for a PetCO2 30 33 mmHg and arterial blood gas analysis was done 30 minutes each change. We calculated the RR for a PaCO2 of 36 mmHg according to the equation: RR (applied) = estimated RR estimated PaCO2/ideal PaCO2. In addition, the linear regression was analyzed between the age and RR.
The estimated regression for RR using Pearson's correlation coefficient was as follows: RR = 19.25-0.07Xage (month).
The equation (RR = 19.25-0.07Xage [month]) could be an index for safe ventilatory management without severe hyper- or hypo-carbia in the pediatric general anesthesia.
Key Words: Controlled ventilation; pediatric general anesthesia; respiratory rate


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