<b><i>Introduction:</i></b> The timing of surgical repair for ureterovaginal fistula (UVF) is under debate, here we introduce our experience to compare the safety and efficacy between early and delayed ureteral reimplantation for UVF. <b><i>Methods:</i></b> Between January 2012 and January 2020, 22 patients who were diagnosed with UVF had received ureteral reimplantation. Baseline characteristics, history of previous abdominal surgery, operative profile, and follow-up data were collected and analyzed. <b><i>Results:</i></b> Among 22 patients diagnosed with UVF, 12 patients received early ureteral reimplantation and others received delayed ureteral reimplantation. Both groups were comparable in baseline characteristics and detailed history of previous operations. The mean operative time of the early surgery group was 140.83 ± 35.28 min, while that of the delayed surgery group was 181.00 ± 43.83 min (<i>p</i> = 0.027). Patients of the early surgery group (183.33 ± 107.31 mL) had less blood loss compared with that of the delayed surgery group (285.00 ± 94.43 mL) (<i>p</i> = 0.030). After an overall mean follow-up of 34.55 months, the ureteral stricture rate of two groups was not statistically significantly different (16.67% in early repair vs. 40.00% in delayed repair, <i>p</i> = 0.348). <b><i>Conclusion:</i></b> With similar long-term outcomes, the early ureteral reimplantation had a shorter operative time and less blood loss. Moreover, the stress during the waiting period could be minimized. High-quality clinical studies with larger sample size are needed to confirm the superior nature of early surgery.
In this study, we carried out a classification survey on sterile plants in the F1 population of high-quality and high-yield Dian-type japonica hybrid rice 'Dianheyou 34', combining with the basic agronomic traits and biological information of the backbone restorer line 'Nan34' and its mutant Rf1 restorer gene lost mutant, the phenomenon and cause of function loss of restorer lines were preliminarily explored. The results showed that the loss of function with natural mutation at Rf1 in 'Nan34' was the main factor that led to sterile plants (two years accounted for 0.26% and 0.79% respectively) in 'Dianheyou 34'F1 hybrid population; the seed setting rate of 'Nan34' wild type was no significant difference compared with its mutant, and the wild type was slightly higher than the mutant in pollen fertility, plant height, ear length and grain length, and slightly greater than the wild type in grain width. By cloning the Rf1 locus of 'Nan34' wild type and its mutant, we found that the mutant in ORF region lost a 574 bp long sequence compared with the wild type, which made it unable to encode some PPR proteins. The loss of this sequence may lead to the loss of recovery function. The results lay a theoretical foundation for revealing genetic variation mechanism of restorer genes in three-line hybrid rice breeding and utilization.
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