Very early glucose tolerance abnormalities in children with cystic fibrosis.

Diabetes is a comorbidity of cystic fibrosis (CF) that worsens prognosis. Abnormal glucose tolerance is associated with decreased lung function and poorer nutritional status. Data are lacking on glucose tolerance abnormalities in young children. We report three infants with abnormal glucose tolerance, beginning under the age of one year, including two cases of very early diabetes which started before the age of six months. None of our patients required long-term insulin treatment, and glycaemia spontaneously improved. All three patients had early pulmonary infection with Pseudomonas aeruginosa and poor nutritional status. This case series presents three unique patients with early dysglycaemia, then improvement over time. This adds to the understanding of the spectrum of early dysglycaemia in CF and highlights the difficulty of diagnosis in this age group.