Thyroid-stimulating hormone, fasting blood glucose and suicidal ideation in Chinese adolescents with major depressive disorder: a cross-sectional study

Abstract

Background Thyroid function and glycolipid metabolic alterations are often associated with major depressive disorder (MDD), yet their roles in suicide risk among adolescents with MDD remain unclear. This study aimed to investigate thyroid-stimulating hormone (TSH) levels, glycolipid metabolism parameters, and their associations with suicidal ideation (SI) in adolescents with MDD. Methods This cross-sectional study was conducted at one general hospital and one psychiatric hospital in Anhui Province, China. Socio-demographic data and laboratory parameters were collected from participants, and the patients’ depressive symptoms and SI severity were assessed using the 24-item Hamilton Depression Rating Scale (HAMD-24) and the Positive and Negative Suicide Ideation Inventory (PANSI), respectively. TSH levels and glycolipid metabolism parameters were also measured. Results A total of 146 adolescents with MDD and 70 healthy controls (HCs) were enrolled in this study. Compared with HCs, patients had lower fasting blood glucose (FBG) levels (P < 0.001). Logistic regression analyses showed that a worse relationship with family, a higher HAMD-24 total score, and higher TSH and FBG levels were independently associated with concurrent SI in adolescents with MDD (all P < 0.05). Furthermore, receiver operating characteristic (ROC) curve analysis showed that the combination of these four factors had a good discriminatory ability for SI, with an area under the curve (AUC) of 0.851. Conclusion In this cross-sectional study, TSH and FBG levels were associated with SI in adolescents with MDD. Nevertheless, whether these parameters can serve as clinically useful biomarkers requires further validation in larger prospective studies.