Assessing prefrontal cortex activity in Graves' disease: a functional near-infrared spectroscopy study

Area of Science:

• Neuroscience
• Endocrinology
• Cognitive Psychology

Background:

• Graves' disease (GD) is linked to cognitive, emotional, and fatigue issues.
• Objective cognitive dysfunction measures in GD have produced inconsistent findings.
• Understanding GD's impact on brain function is crucial for managing patient well-being.

Purpose of the Study:

• To investigate cognitive fatigability in premenopausal women with first-time hyperthyroid GD.
• To assess prefrontal cortex (PFC) functional activity using fNIRS during a demanding cognitive task.
• To explore potential differences in PFC activation between GD patients and healthy controls.

Main Methods:

• Compared 28 hyperthyroid GD patients and 28 controls using the Animal Stroop test.
• Administered a 30-minute cognitively exhausting reading comprehension task.
• Utilized functional near-infrared spectroscopy (fNIRS) to measure PFC activity before and after the task.

Main Results:

• Both groups improved on the Stroop task post-exercise; no cognitive performance differences were found.
• Controls showed increased left dorsolateral PFC activation post-task, unlike GD patients.
• Exploratory analysis indicated reduced PFC involvement in GD patients, with lower oxy-hemoglobin level increases.

Conclusions:

• This fNIRS study did not detect changes in PFC functional activity after prolonged mental exertion in hyperthyroid GD patients.
• The mechanisms underlying self-reported fatigue in Graves' disease require further investigation.
• Future studies should explore alternative methods to elucidate GD-related fatigue.