First thoracic vertebral body as reference for endotracheal tube placement.
Department of Neonatology, Queen's University, Kingston General Hospital, Ontario, Canada.
After intubation in newborn infants, the placement of the endotracheal tube in the trachea must be checked by a chest radiograph. The most commonly used reference point for placement is the medial ends of the clavicles. The position of the clavicles may be variable. The present study was carried out to determine whether the body of the first thoracic vertebra should be used instead of the clavicles because its position on chest radiographs is more constant. Seventy eight radiographs obtained from 35 neonates were examined prospectively. The carina was situated between T3 and T5, most commonly at T3-4 or T4 (85%). The position of the clavicles varied markedly from patient to patient and within the same patient on different days, and this variation was significantly higher than that of the carina. On 65 (83%) examinations the clavicles lay above the first thoracic vertebra. It is recommended that, for accurate placement within the trachea, the tip of the endotracheal tube should be placed at the level of the body of the first thoracic vertebra; this could be used as the sole reference point on chest radiographs obtained in the neonatal period.
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