Severe hypertransaminasaemia during the acute hepatitis of unknown origin alert of 2022

The impact of acute severe hepatitis of unknown origin in children (SHIC) subject to a medical alert in 2022 medical alert is poorly understood.

Observational study of the incidence, aetiology and clinical presentation of acute hypertransaminasaemia (HTRA) with laboratory values in the severe range (ALT and/or AST ≥ 500 U/L) in paediatric patients (age 0 to 16 years) in one health care zone from 2012 to 2022, comparing the periods of the SHIC alert and the SARS-CoV2 pandemic with previous years.

The incidence of severe HTRA of any cause was 195.28 per 100 000 blood tests, with an incidence of 181.38 in the SHIC alert period and 166.09 during the SARS-CoV-2 pandemic, without statistically significant differences. Hepatitis of unknown origin accounted for 7.42% of total cases and transaminase levels normalised in 126 days (SD, 99.4). During the SHIC alert period there was a nonsignificant trend towards a higher incidence, as occurred in 2012 and 2018. In this group of cases, there was a significant increase in the presence of fever, vomiting and upper respiratory symptoms and lower levels of albumin and alkaline phosphatase. One patient required a liver transplant.

In our setting, there was no significant increase in the incidence of severe HTRA of any aetiology or of unknown source during either the SHIC alert or the SARS-CoV2 pandemic. In the SHIC alert period, a clinical pattern emerged characterised by an increase in nonspecific infectious symptoms, so we cannot rule out a higher prevalence of an infectious agent different from the usual involved pathogens, but it did not cause a significant change in epidemiological trends.