We hypothesized that—as in other common pediatric conditions—acute appendicitis (AA) could be complicated by acute kidney injury (AKI). We aimed to investigate the prevalence of, and the factors associated with AKI in a cohort of patients with AA. We retrospectively collected data of 122 children (63.9% of male gender; mean age 8.6 ± 2.9 years; range: 2.2–13.9 years) hospitalized for AA. AKI was defined according to the Kidney Disease/Improving Global Outcomes creatinine criteria. We considered a basal serum creatinine value as the value of creatinine estimated with the Hoste (age) equation, assuming that the basal estimated glomerular filtration rate (eGFR) was 120 mL/min/1.73 m². Explorative univariate logistic regression analysis was used to explore the associations with AKI. Out of 122 patients, nine (7.4%) presented with AKI. One patient had stage two AKI and the remaining had stage one AKI. The maximum AKI stage was found at admission. The patients with AKI showed a higher prevalence of fever ≥ 38.5 °C (p = 0.02), vomiting (p = 0.03), ≥5% dehydration (p = 0.03), and higher levels of both C-reactive protein (CRP) (p = 0.002) and neutrophils (p = 0.03) compared with patients without AKI. Because all patients with AKI also presented with vomiting, an Odds Ratio (OR) for the vomiting was not calculable. The exploratory univariate logistic regression analysis confirmed that fever ≥ 38.5 °C (OR = 5.0; 95% CI: 1.2/21.5; p = 0.03), ≥5% dehydration (OR = 8.4; 95% CI: 1.1/69.6; p = 0.04), CRP (OR = 1.1; 95% CI: 1.05/1.2; p = 0.01), and neutrophil levels (OR = 1.1; 95% CI: 1.01/1.3; p = 0.04) were all predictive factors of AKI. AKI can occur in 7.4% of patients with AA. Particular attention should be paid to the kidney health of patients with AA especially in the presence of vomiting, ≥5% dehydration, fever ≥ 38.5 °C, and high CRP and neutrophils levels.

Background: Parvovirus B19 (PVB19) is a small, nonenveloped, single-stranded DNA virus commonly causing asymptomatic infections or mild, flu-like symptoms. In children, PVB19 can lead to various clinical conditions, including erythema infectiosum, arthropathy, transient aplastic crisis and papular-purpuric eruptions, among others. Methods: We present 3 pediatric cases treated at Luigi Sacco University Hospital in Milan, Italy, in March 2024, each demonstrating distinct manifestations of PVB19 infection. Case 1 involved a 7-year-old girl with a maculopapular rash and panniculitis-like symptoms. Case 2 described an 8-year-old boy with a maculopapular rash, vasculitis component and mild thrombocytopenia. Case 3 focused on a 7-year-old girl with petechial and purpuric eruptions and a mild decrease in platelets. Serological tests confirmed PVB19 infection in all cases. Results: The discussed cases highlight the heterogeneous clinical spectrum of PVB19 infection and emphasize its potential to cause thrombocytopenia even in healthy children. The recent surge in PVB19 cases in Europe, aligned with known epidemiological cycles, underscores the importance of vigilance in diagnosis, particularly during peak seasons. Additionally, concerning the role of serological testing in the diagnostic process, the potential for cross-reactivity among viral antigens is pointed out. Conclusion: PVB19 is a common infection with a broad range of clinical presentations. Awareness of its potential complications, including thrombocytopenia, even in nonimmunocompromised children, is crucial. Moreover, understanding the epidemiological patterns of PVB19 can aid in anticipating and managing outbreaks, thus minimizing its impact on pediatric health.

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