The features of neuroendocrine changes in cranial injury associated with diabetes mellitus

Aim. To study the features of neuroendocrine regulation in cranial injury associated with diabetes mellitus. Methods. Experiments were carried out on 100 male white rats that were divided into the following groups: the first group (n=10) - control group consisted of 10 intact animals, the second group (n=40) - rats with simulated traumatic cranial injury, the third group (n=10) - rats with experimental diabetes mellitus, the fourth group (n=40) - rats with simulated traumatic cranial injury and experimental diabetes mellitus. Experimental diabetes mellitus was induced by a single streptozotocin solution intraperitoneal injection. Animals were withdrawn from the experiment at 3, 24 hours, 5 and 14 days after the traumatic cranial injury. The mathematical analysis of the cardiac rhythm variability was performed by ECG intervals data analysis. Corticosterone serum levels were measured using ELISA. Results. Based on a comprehensive ECG intervals data analysis, it was found that after experimental traumatic cranial injury the imbalance of autonomic nervous system with increased sympathetic autonomic nervous system function occurs, manifesting as a deregulation of cholinergic and adrenergic effects on sinoatrial node. In diabetes, an increase of the role of sympathetic effects on the sinus node functioning also occurred. Revealed autonomic nervous system deregulation after experimental traumatic cranial injury associated with experimental diabetes mellitus were associated with sympathetic autonomic nervous system over-function, parasympathetic autonomic nervous system exhausting and decreased recovery speed. There was a relevant increase in corticosterone serum concentration reaching its maximum 24 hours after traumatic cranial injury. Conclusion. A significant autonomic nervous system sympathetic shift and autonomic regulation intensifying characterizes the clinical course in traumatic cranial injury associated with diabetes mellitus, a positive correlation of corticosterone serum concentration and sympathetic autonomic nervous system over-function was revealed in animals with experimental traumatic cranial injury, particularly when associated with experimental diabetes mellitus.

traumatic cranial injury, diabetes mellitus, ECG intervals data analysis, corticosterone