Relationship between brain activity and voiding patterns in healthy preterm neonates

In preterm neonates, bladder voiding during quiet sleep was accompanied by cortical arousal that might have emanated from a lower center.Table. Four-hour voiding observations in the three groups.Group IGroup IIGroup IIIPBW (kg)1.41 ± 0.281.70 ± 0.361.90 ± 0.49*0.00VF (times)4.43 ± 0.98*3.29 ± 0.492.79 ± 1.190.01VF/QS (times)2.46 ± 1.051.64 ± 1.081.00 ± 0.92*0.00VV (ml)6.34 ± 4.15*9.39 ± 5.309.18 ± 6.280.04BC (ml)9.08 ± 4.6110.58 ± 5.3611.50 ± 6.150.42BC/BW7.14 ± 4.355.53 ± 2.376.59 ± 3.170.43PVR/BC0.24 ± 0.170.19 ± 0.180.17 ± 0.150.31UFR (ml/sec)2.41 ± 1.601.65 ± 0.961.99 ± 1.260.26Postconceptional ages: Group I, 31-33 weeks; Group II, 33-35 weeks; Group III, 35-37 weeks.BC/BW, bladder capacity/birth weight (BC was defined as the sum of VV and PVR); BW, birth weight; PVR/BC, postvoiding residual volume/bladder capacity; UFR, urinary flow rate; VF, voiding frequency; VF/QS, voiding frequency/quiet sleep; VV, voided volumes.*P < 0.05.