Autonomic Modulation of Sinus and Atrioventricular Nodes in Premature Low‐Birth‐Weight Infants

Respiratory vagal activity is expressed by heart rate variability (HRV) at approximately 1 month of age in premature low‐birth‐weight infants (PLBWI). However, the autonomic inputs into the sinus node (SAN) and atrioventricular node (AVN) in PLBWI are unclear. We evaluated the variability in PP and PR intervals at day zero (day 0) and 1 month (1 month) after birth in 16 PLBWI (gestation 32.3 ± 1.3 weeks, birth weight 1.578 ± 257 g). The...