A Swedish study reveals that long-term eye and kidney complications in childhood-onset type 1 diabetes follow different biological timelines, highlighting the need for personalised, lifelong surveillance and management strategies.
A Swedish follow-up study has found that the burden of microvascular complications in childhood-onset type 1 diabetes remains high decades after diagnosis, with diabetic retinopathy and albuminuria appearing to follow different biological clocks. Published online in the Journal of Diabetes and Its Complications, the research followed patients for a median of 33 years and found that 85% developed retinopathy while 45% developed albuminuria.
The team, led by Edvin Hornbrinck at Uppsala University, used linked national registry data to examine how age at diagnosis, early glucose control and perinatal factors shaped later risk. Among 90 patients with follow-up data, diabetes duration emerged as the strongest predictor of retinopathy and proliferative retinopathy, the sight-threatening form of the disease. By contrast, chronological age was more closely tied to albuminuria, a marker of kidney damage, suggesting that eye and renal complications may not advance in parallel.
Glycaemic control still mattered. Higher average HbA1c levels in the first 5 to 10 years after diagnosis were associated with greater risk of retinopathy, proliferative retinopathy and albuminuria. The study also found that women had about a threefold higher risk of proliferative retinopathy, while existing eye disease raised the chance of later albuminuria and albuminuria increased the risk of subsequent retinopathy. The authors said the findings support lifelong intensive management, including attention to factors beyond glucose alone.
The new results fit with earlier research showing that long-term kidney and eye risks remain substantial in people with childhood-onset type 1 diabetes. A British Medical Journal study of 527 patients found that microalbuminuria rose steadily over time and was strongly linked to higher HbA1c. Other cohort studies have also associated younger age at onset, female sex, blood pressure and sustained hyperglycaemia with later retinopathy or nephropathy. Taken together, the evidence points to the need for early and sustained surveillance, with monitoring tailored to age at diagnosis, sex and duration of disease.
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