Quick Literature Updates Ep 21

VTE Prophylaxis in Pediatric Trauma

Pediatric trauma patients are at high risk for developing venous thromboembolism 1:02. The question is not whether to anticoagulate high-risk children, but when — and a multicenter cohort study from 2019 to 2022 suggests the window is narrower than many centers practice 1:09.

The study enrolled 460 high-risk pediatric trauma patients younger than 18 years across eight pediatric trauma centers 1:09. More than half received chemical VTE prophylaxis 1:18. The finding that matters: delaying blood thinners beyond 24 hours of hospital arrival increases the risk of blood clots 1:25. VTE prophylaxis is safe and effective for pediatric trauma patients when started within 24 hours of admission 1:32.

For the referring physician, this means the decision to anticoagulate a high-risk pediatric trauma patient should happen on the day of admission, not after the first days of observation 1:25 1:32. The 24-hour threshold is not arbitrary — it marks the point where thrombotic risk begins to climb 1:25. If you are transferring a child with significant trauma to a pediatric center, early communication about VTE risk stratification ensures prophylaxis is not delayed by the logistics of transfer.

Ovarian Tissue Cryopreservation in Childhood Cancer

Gonadotoxic chemotherapy and radiation can render prepubertal girls infertile before they reach reproductive age 2:33. Ovarian tissue cryopreservation — harvesting and freezing ovarian cortex before cancer treatment — offers a fertility preservation option when oocyte or embryo cryopreservation is not feasible 2:33. A systematic review by Gillielli et al. examined outcomes in pediatric cancer patients who underwent this procedure 2:08.

The review included 12 studies after screening 104 abstracts and 34 full-text articles 2:08. Ovarian tissue cryopreservation was performed in 501 patients 2:16. Of these, 5.9% subsequently underwent ovarian tissue transplantation 2:16 — a low rate reflecting both the experimental nature of the procedure and the fact that many patients are still too young to have attempted transplantation 2:16. Among those who did undergo transplantation, 33% were able to become pregnant 2:27.

This is not a mature technology 2:33. The transplantation rate is low 2:16, and the pregnancy rate among those transplanted, while encouraging, is based on small numbers 2:27. The reviewers concluded that ovarian tissue cryopreservation has advantages for pediatric cancer patients but needs further study 2:33. For the oncologist or primary care physician counseling families at cancer diagnosis, this means ovarian tissue cryopreservation is a reasonable option to discuss — particularly for prepubertal girls facing high-dose alkylating agents or pelvic radiation — but it should be framed as investigational, not standard care 2:33. Referral to a fertility preservation program should happen before chemotherapy starts, as the window for tissue harvest is narrow.

Nephron-Sparing Surgery for Wilms Tumor

Radical nephrectomy has been the standard surgical approach for unilateral Wilms tumor, but nephron-sparing surgery — removing the tumor while preserving uninvolved renal parenchyma — has gained traction as imaging and surgical technique have improved 3:25. The question is whether preserving renal tissue compromises oncologic outcomes 3:25.

A meta-analysis by Lee et al. gathered 26 studies evaluating nephron-sparing surgery in unilateral Wilms tumor 3:25. Nephron-sparing surgery increased glomerular filtration after surgery 3:25 — the expected result of leaving more functioning nephrons. The oncologic outcomes were equivalent: no significant differences in overall survival 3:37, recurrences 3:37, hypertension 3:37, or renal dysfunction 3:37 compared to radical nephrectomy.

This is not a mandate to perform nephron-sparing surgery in every case — tumor location, size, and involvement of the collecting system all constrain feasibility — but it establishes that when nephron-sparing surgery is technically achievable, it does not compromise cancer control and it preserves renal function 3:25 3:37 3:37. For the pediatrician following a child with Wilms tumor, this means that if the surgical team proposes nephron-sparing surgery, it is not a compromise or a risk; it is an evidence-supported approach that may reduce the long-term burden of chronic kidney disease in a survivor population already at risk for late effects 3:25 3:37.

When to Involve These Teams

For VTE prophylaxis: high-risk pediatric trauma patients should be identified and started on chemical prophylaxis within 24 hours of admission 1:25 1:32. If you are transferring a child, communicate the mechanism and severity of injury so the receiving team can initiate prophylaxis promptly.

For fertility preservation: refer prepubertal girls facing gonadotoxic cancer treatment to a fertility preservation program before chemotherapy begins 2:33. The discussion should happen at diagnosis, not after treatment has started.

For Wilms tumor: surgical approach is determined by the pediatric surgical oncology team based on tumor characteristics and institutional expertise 3:25. The referring physician's role is early recognition and referral to a center with pediatric oncology capability.