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A high-flow nasal cannula (HFNC) generates continuous positive pressure on the upper airway of infants. This study aimed to evaluate the association between pharyngeal pressure and flow rate, and association between pharyngeal pressure and body weight for two types of HFNC devices commonly used in preterm infants the Optiflow Junior, hereafter "FP" (Fisher Paykel, Auckland, New Zealand), and the Precision Flow, hereafter "VT" (Vapotherm, Exeter, NH, USA). Pharyngeal pressure measurements were performed in 12 preterm infants who re