[Urodynamic study on primipara and bipara after parturition]

To investigate the bladder function in primipara and bipara within 1 week after delivery using urodynamic study.

Investigations on urodynamic changes were performed in 36 primipara volunteers and 12 bipara volunteers according to the recommendations of the International Continence Society (ICS). Fourteen women with upper urinary tract diseases but having normal lower urinary tract function, who had not experienced parturation were included as controls.

Functional bladder volume (FBV) of primipara and bipara after delivery and normal desire cytometric capacity (NDCC) were respectively lower than those of control group (437 +/- 193) ml and (338 +/- 120) ml, however FBV and NDCC between primipara and bipara (310 +/- 154), (215 +/- 90) ml vs (243 +/- 141), (225 +/- 115) ml were not significantly different. The static Pure. max and Pure. clos. max of primipara and bipara were respectively higher than those of control group (87 +/- 7) cm H2O (1 cm H2O = 0.098 kPa) and (78 +/- 8) cm H2O (P < 0.05), but there were no significant differences in Pure. max and Pure. closure. max between primipara and bipara (116 +/- 28) cm H2O and (97 +/- 25) cm H2O vs (120 +/- 31) cm H2O and (106 +/- 37) cm H2O. There were significant differences in functional urethral length between primipara (31 +/- 6) mm and bipara (27 +/- 5) mm. Abrams-Griffiths number (AG) and urethral resistance factor (URA) of primipara and bipara also showed no significant differences from control group (11 +/- 3) cm H2O. Each group had one case with leakage on valsalva action, and valsalva leak point pressure (VLPP) was respectively 50 cm H2O and 67 cm H2O.

It is suggested that bladders of primipara and bipara shortly after delivery are sensitive and static urethral pressure parameters are increased, but voiding ability is still normal. There are no significant differences in urodynamic parameters between primipara and bipara.