Kraaijenga JV, et al. - This study was designed in order to comparatively evaluate the accuracy of apnea classification based on diaphragmatic EMG (dEMG) and chest impedance (CI) tracings in preterm infants. An improvement was reported in the accuracy of apnea classification through transcutaneous dEMG when compared to CI in preterm infants. Hence, this technique served as a promising candidate for future monitoring systems.