Glycemic control and excess mortality in type 1 diabetes

Area of Science:

• Endocrinology
• Cardiology
• Public Health

Background:

• The association between glycemic control and mortality risk in type 1 diabetes is not fully understood.
• This study investigates the excess risk of death from all causes and cardiovascular events in type 1 diabetes patients across different glycemic control levels.

Purpose of the Study:

• To quantify the excess mortality risk associated with varying levels of glycemic control in type 1 diabetes.
• To compare mortality rates between type 1 diabetes patients and matched controls from the general population.

Main Methods:

• A Swedish registry-based observational study using the National Diabetes Register.
• Inclusion of type 1 diabetes patients registered after January 1, 1998, with five age-, sex-, and county-matched controls per patient.
• Follow-up until December 31, 2011, using the Swedish Register for Cause-Specific Mortality.

Main Results:

• Patients with type 1 diabetes had a significantly higher risk of all-cause mortality (aHR, 3.52) and cardiovascular death (aHR, 4.60) compared to controls.
• Increasing glycated hemoglobin levels correlated with progressively higher risks of all-cause and cardiovascular mortality.
• Even with glycated hemoglobin ≤6.9%, patients had double the risk of death compared to controls.

Conclusions:

• Type 1 diabetes patients with glycated hemoglobin ≤6.9% experienced a twofold increased risk of all-cause and cardiovascular mortality.
• Glycemic control is a critical factor in mitigating mortality risks for individuals with type 1 diabetes.
• The findings highlight the need for stringent glycemic management in type 1 diabetes to reduce long-term health consequences.