Effect of mild asphyxiation influence on voiding in newborns

Objective The aim of this study was to investigate the effect of mild asphyxiation (A) on voiding pattern of newborns. Methods A total of 67 newborns, 34 cases with mild asphyxiation and 33 cases normal, without low urinary tract pathological abnormalitiesdiseases, single birth,hospitalized in NICU were included in this study. They were divided into 4 groups: 16 cases of asphyxiation with normal weight(ANW), 18 cases of asphyxiation with low weight(ALW), 18 cases of no asphyxiation with normal weight (NANW)and 15 cases of no asphyxiation with low weight (NANW). Each group undertook 12 hours (9:00am ～9:00 pm) free voiding observation. We recorded, recording voiding time, the voiding volume, post-voiding residual urine (PVR) by B ultrasound, empty voiding and awake or sleep percentage at voiding. Results Five hundred and thirty three episodes of voiding were recorded. The voiding frequency in ANW (9. 5 ± 2. 7)times is higher than those of NANW(7. 7 ± 2. 3)times (P＜0. 05), but the voiding volume and PVR are no significant difference (P＞0. 05)between 2 groups. The voiding frequency, volume and PVR in ALW and NALW are no significant difference(P＞0.05). The voiding frequency and volume in ANW(9. 5 ± 2. 7)times, (17. 7± 5. 8)ml respectively is higher than ALW(7. 7 ± 2. 3)times, (13. 5 ± 6. 1 )ml (P＜0. 05), but PVR are no significant difference(P＞0. 05). The voiding volume in NANW (21.1 ± 11.0)ml is higher than NALW( 13. 1 ± 6. 2)ml(P＜0. 05), but the voiding frequency and PVR are no significant difference(P＞0. 05). Voiding empty and awake percentage is higher in ANW and NANW, but no significant difference; voiding empty and awake percentage in LNW and NALW are no significant difference.Conclusions Mild asphyxiation induced more voiding frequencies in ANW newborn but it has little impact on voiding volume, PVR, empty voiding percentage and awake voiding percentage in all newboms. Its mechanism is unclear. Key words: Asphyxia neonatorum;  Infant, low body weight;  Urination