Giving patients a sugary drink two hours before gallbladder surgery does not significantly change their blood sugar or adrenaline levels after the operation.
Mechanism
Synthesis from 1 study
Drinking a sugary drink before surgery tells the body it has enough energy, so it lowers some stress hormones like cortisol and noradrenaline. But it doesn’t lower adrenaline or raise blood sugar because those are controlled by different systems that stay active during surgery.
Most probable mechanism
Drinking a sugary solution before surgery tells the body that energy is available, so it doesn't need to ramp up stress hormones like cortisol or noradrenaline. This reduces some stress responses, but not others — blood sugar and adrenaline stay the same because the body doesn't need to release more glucose or adrenaline to cope with the surgery.
Oral ingestion of maltodextrin is rapidly broken down into glucose, increasing circulating glucose availability without triggering a significant rise in blood glucose levels due to concurrent insulin-mediated uptake.
Elevated glucose and improved insulin sensitivity signal metabolic sufficiency to the hypothalamus, reducing the activation of corticotropin-releasing hormone (CRH) neurons.
Reduced CRH release leads to decreased adrenocorticotropic hormone (ACTH) secretion from the pituitary, resulting in lower cortisol production by the adrenal cortex.
Metabolic stabilization reduces hypothalamic and hepatic signals that drive sympathetic nervous system activation, decreasing noradrenaline release from postganglionic nerve terminals and the adrenal medulla.
Adrenaline secretion from the adrenal medulla remains unchanged because the sympathetic drive to chromaffin cells is not sufficiently suppressed by metabolic signals alone, and surgical stress continues to activate this pathway independently.
Evidence from Studies
Supporting (1)
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