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Cystic fibrosis and CFTR-related disorder with electrolyte imbalance at diagnosis: clinical features and outcome in an Italian cohort

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Abstract

There is limited information available on the clinical data, sweat test trends, and outcomes of individuals with cystic fibrosis (CF) who present with an isolated episode of hypoelectrolytemia with metabolic alkalosis (HMA). This study describes a cohort of Italian individuals with HMA as presenting symptom. The study is a retrospective multicenter analysis of individuals who presented with HMA as an initial symptom and was followed at 8 Italian CF Centers, from March 1988 to March 2022. Demographic, clinical, microbiological, biochemical, and genetic data were extracted from local health records. Ninety-three individuals were enrolled in the study. At first evaluation, 82 (88.2%) were diagnosed with CF, and 11 received a CFTR-Related Disorder (CFTR-RD) diagnostic label. Twenty-three (85.1%) out of the 27 subjects who underwent CF neonatal screening (NBS) resulted falsely negative. After a mean observational period of 11.5 years, most of subjects had a mild pulmonary phenotype, pancreatic sufficiency, and rarely CF-related complications. Four CFTR-RD changed to a CF diagnosis during the study period, resulting in 86 (92.4%) subjects classified as CF.

Conclusions: Most CF patients presenting with isolated HMA have a mild course of disease and rarely CF-related complications.

What is Known:

• Isolated episode of hypoelectrolytemia with metabolic alkalosis is a well-known onset symptom of Cystic Fibrosis in infancy.

• There is limited information available on the clinical data and outcomes of individuals with Cystic Fibrosis who present with electrolyte imbalance at diagnosis.

What is New:

• Most patients with Cystic Fibrosis presenting with isolated hypoelectrolytemia and metabolic alkalosis have a mild course of disease and rarely CF-related complications.

• Electrolyte imbalance at diagnosis of Cystic Fibrosis is a common symptom in children not screened for CF at birth, or in those who received a false negative result from newborn screening.

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Data availability

Data supporting the findings of this study are available from the corresponding author upon reasonable request.

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Authors and Affiliations

Authors

Contributions

Conceptualization: V.T. and D.S. Methodology: V.T, R.P, D.S. Validation: V.T, R.P. D.S. Formal analysis: V.T, C.F., D.S. Investigation: V.T, R.P, D.S. Resources: V.T, R.P, G.L, P.V, A.T, G.T, F.F, A.P, P.P, L.C, C.C, D.S. Data curation: V.T, R.P, C.F, D.S. Writing-original draft preparation: V.T, R.P, D.S. Writing-review and editing: V.T, R.P, D.S. Project administration: V.T, D.S. All authors have read and agreed to the published version of the manuscript.

Corresponding author

Correspondence to Vito Terlizzi.

Ethics declarations

Ethics approval

The study was conducted in accordance with the Declaration of Helsinki and approved by the Ethics Committee of the CF coordinator center (Florence, Ethics Committee number 134/2022). Informed consent was obtained from all patients (or from their legal guardians) for the use of anonymous clinical data for research purposes.

Informed consent

Informed consent was obtained from all subjects involved in the study or from the patients to publish this paper.

Conflict of interest

The authors declare no competing interests.

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Communicated by Peter de Winter

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Terlizzi, V., Padoan, R., Leonetti, G. et al. Cystic fibrosis and CFTR-related disorder with electrolyte imbalance at diagnosis: clinical features and outcome in an Italian cohort. Eur J Pediatr 182, 5275–5283 (2023). https://doi.org/10.1007/s00431-023-05193-9

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