Steady state hormonal secretion in traumatic quadriplegia

Area of Science:

• Endocrinology
• Neuroscience
• Metabolism

Background:

• Physiological complete cervical spinal cord transection causes quadriplegia and disrupts sympathetic pathways.
• This disruption suggests potential metabolic deficiencies and abnormal endocrine function.

Purpose of the Study:

• To investigate non-stimulated secretion of metabolism-influencing hormones in quadriplegic patients.
• To evaluate the impact of paralysis duration on hormone levels.

Main Methods:

• Measured thyroxine, iodothyronine binding index, testosterone, growth hormone, calcitonin, and parathyroid hormone in fasting subjects.
• Repeated evaluations at different time points post-injury in healthy and quadriplegic individuals.

Main Results:

• Thyroxine levels were low initially, normalizing later. Testosterone remained low, with the greatest decrease in the first two months.
• Growth hormone was often elevated early post-injury, returning to near-normal levels later. Calcitonin and parathyroid hormone levels were generally normal.
• Steady-state hormone secretion is not inherently altered by quadriplegia but temporarily modified by injury, lifestyle changes, and sedation.

Conclusions:

• Temporary endocrine changes in early-stage quadriplegia are likely overcome through rehabilitation and an active lifestyle.
• The study suggests that while initial hormone levels may fluctuate, the endocrine system adapts post-spinal cord injury.