Failure of endtidal carbon dioxide to confirm tracheal intubation in a neonate with a single ventricle and severe pulmonary stenosis.

On the day of surgery, heart rate (HR) was 139 bpm, noninvasive blood pressure (BP) 93/31 mmHg, SpO2 81% on room air, and temperature 36.5° C. Patient was preoxygenated with 100% O2, which increased SpO2 to 99%. Anesthesia was induced by face mask with sevoflurane in oxygen with gradual increase in concentration to 6%. Immediately after venous access was obtained, propofol 2 mg/kg-1 was administered. Patient was easy to ventilate and saturation was 99% when intubation was attempted for the first time. Upon laryngoscopy, vocal cords could be visualized and uncuffed endotracheal tube (3.0 mm) was inserted easily.