Characteristics influencing expected cognitive performance during hypoglycaemia in type 2 diabetes

Area of Science:

• Neuroscience
• Endocrinology
• Psychology

Background:

• Acute hypoglycemia is linked to cognitive impairment in type 2 diabetes patients.
• Limited understanding exists regarding the discrepancy between perceived and actual cognitive deficits during non-severe hypoglycemia.

Purpose of the Study:

• To investigate demographic and clinical factors influencing the gap between self-assessed and objectively measured cognitive function in type 2 diabetes patients during acute non-severe hypoglycemia.

Main Methods:

• A double-blinded, cross-over study involving 25 type 2 diabetes patients undergoing normoglycemic and non-severe hypoglycemic clamps.
• Cognitive function was assessed using subjective self-evaluation (visual analogue scale) and objective neuropsychological testing.
• A novel statistical formula calculated a 'cognitive discrepancy' score, with multiple regression analysis identifying associated factors.

Main Results:

• Patients generally underestimated their cognitive abilities during hypoglycemia compared to normoglycemia (p < 0.01).
• This underestimation was more pronounced in younger patients (p=0.02), those with higher verbal IQ (p=0.03), and individuals reporting more shakiness (p=0.03).

Conclusions:

• Type 2 diabetes patients tend to underestimate cognitive deficits during non-severe hypoglycemia.
• Younger age, higher IQ, and increased shakiness are associated with greater underestimation, suggesting potential for heightened anxiety regarding cognitive challenges in daily life.