Using radiofrequency activation, an ultrahigh-viscosity cement is prepared and then injected through a cement delivery instrument, in a slow, constant pace, minimizing cement leaking and ensuring uniform cement distribution, in a VP-like manner.
Although the application of dendrimers as drug-delivery instruments has been advertised as a major area of their potential application, this part has really been little studied [ 121].
Intra-partum variables include vaginal delivery with instruments, episiotomy, labor augmentation, retained placenta, vaginal tears, fetal macrosomia (> 3500 g), length of 1st and 2nd stage, and absence of AMTSL.
In unadjusted analyses, Native Hawaiians had the lowest percentage of obstetric trauma from both vaginal deliveries without instruments (1.6%) and vaginal deliveries with instruments (12.6%) across all racial/ethnic groups.
Both groups were compared with respect to the incidence of cesarean delivery or instrument delivery and the incidence of transfer to the neonatal ward.
Chinese (5.7%) had the highest percentage of obstetric trauma from vaginal deliveries without instruments.
Chinese (5.7%) and Japanese (4.5%) had the highest percentage of obstetric trauma from vaginal deliveries without instruments while Hawaiians had the lowest percentages (1.6%) in all groups.
In multivariable models, Chinese women retained significantly higher rates of obstetric trauma for vaginal deliveries without instruments (Rate Ratio (RR): 1.95; 95% CI: 1.53-2.48) compared to whites and Chinese also had significantly higher birth trauma in vaginal delivery with instrument (RR 1.42; 95% CI 1.06, 1.91) in final models.
Japanese and Chinese had significantly higher rates of obstetric trauma for vaginal deliveries without instruments (RR:1.52; 95% CI 1.27-1.81 and RR:1.95 95% CI 1.53-2.48, respectively) compared to whites, and Chinese also had significantly higher rates of birth trauma in vaginal delivery with instrument (RR 1.42; 95% CI 1.06-1.91).
