Prophylactic

This will be a Prospective, randomized, open- label, parallel-group, center trial, which will include 80 of Children which will be admitted at Pediatric Intensive Care Unit (PICU) of Menoufia university Hospital from August 2026 to Mars 2027. Aim of the study will be: 1. Compare the incidence of clinically significant catheter-related complications (catheter occlusion requiring intervention or catheter-related thrombosis) within 14 days after CVL insertion between children receiving prophylactic anticoagulation and those receiving standard care. 2. Compare time-to- first catheter occlusion. 3. Compare rate of catheter-related bloodstream infection (CLABSI) within 30 days. 4. Compare number of catheter manipulations and unplanned catheter removals. 5. Compare major and minor bleeding events. 6. Assess catheter dwell time and need for thrombolysis or therapeutic anticoagulation.

During hysterectomy bacteria may enter into the peritoneal cavity through vaginal opening and contaminate the healing tissues. The risk for deep infection after hysterectomy is about 5%. By reducing post-hysterectomy infections, it is possible to reduce individual burden of disease in addition to the direct and indirect financial costs. This study primary aim is to assess if prophylactic preoperative use of azithromycin in addition to generally used cefuroxime decreases post-hysterectomy infections as compared to cefuroxime only prophylaxis during 30 days after hysterectomy. Secondary aim is to assess if there is change in post-hysterectomy superficial infections, urinary tract infections, or post-operative fever between the cohorts and to report possible side-effects of the used antibiotics. In addition, the study finds out a possible role of bacterial vaginosis and microbiome n post-hysterectomy infections.