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Steady State Hormonal Secretion in Traumatic Quadriplegia

^* Departments of Rehabilitation, Physiology, Biochemistry, Medicine, Physical Medicine, and Neurology, Baylor College of Medicine Houston, Texas 7703
^{* *} Department of Internal Medicine, Endocrinology, and Metabolism, The University of Texas Medical Branch Galveston, Texas 77550

Reprint requests to: Jacqueline Claus-Walker, Ph.D., Texas Institute for Rehabilitation and Research, PO BOX 20095, Houston, Texas 77030.

Physiologically complete cervical spinal cord transection results in motor and sensory quadriplegia and interruption of the sympathetic neural pathways; this condition leads to metabolic deficiencies suggestive of abnormal endocrine function. An investigation of the non-stimulated secretion of some of the hormones influencing metabolism was undertaken by evaluating thyroxine, iodothyronine binding index, testosterone, growth hormone, calcitonin, and parathyroid hormone in venous blood of fasting healthy subjects and quadriplegic patients. The effect of the duration of the paralysis was examined by repeating the evaluations at different periods after onset. The results show that 1) thyroxine was low for 2 months after onset in 21 patients and normal thereafter in 53 patients, 2) testosterone was low throughout the study in 62 patients; the decrease is greatest during die first 2 months, 3) growth hormone was often increased in 46 patients for 8 months after onset, and nearly normal afterward in 25 patients, 4) calcitonin was normal in 22 patients throughout the study, and 5) parathyroid hormone was normal in relation to normal serum calcium as early as 6 days after onset in 79 out of 83 patients. These data do not preclude a parathyroid hormone increase at onset, or alterations in the patterns of circadian secretion and in the responses to specific stimulation for the hormones evaluated. Therefore, it may be concluded only that the steady state secretion of these hormones is not altered by traumatic quadriplegia per se, but is temporarily modified by the original insult to the nervous system, and by changes in life pattern and the heavy sedation that follows. The results suggest that the minor endocrine changes occurring in quadriplegic patients during the early period of paralysis will be rapidly overcome by rehabilitation to an active life pattern.

Supported by grant from Rehabilitation Services Administration, #16 P 56813/6, Department of Health, Education, and Welfare, Washington, D. C, and from the Schlumberger Foundation, Houston, Texas.

Received March 20, 1976.

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