Why the study?
Does immersion of the forearm and hand in hot water elicit an abnormal reflex cutaneous vasomotor response in elderly hemiplegics?
Does immersion of the forearm and hand in hot water elicit an abnormal reflex cutaneous vasomotor response in elderly hemiplegics?
Elderly hemiplegics demonstrate a paradoxical vasoconstrictive response to heat, indicating bilateral cortical control of hypothalamic autonomic function.
Paradoxical heat-induced vasoconstriction in hemiplegics may reflect autonomic dysregulation; leaves open bilateral cortical control mechanisms pending prospective validation.
A defect In the thermoregulatory mechanism of hemiplegics has been demonstrated. In six out of 10 elderly hemiplegics, when the forearm and hand were Immersed in hot water, instead of the expected cutaneous vasodilatation, vasoconstriction was observed In the opposite limb. This paradoxical response was bilateral in three subjects, but was restricted to the healthy (ipsilateral) side in the remaining three, Indicating that autonomic vasomotor abnormalities in hemiplegia are not confined to the contralateral (hemlplegic) side as previously assumed. This abnormal response is considered to be due to damage to cortico-hypothalamic connections, and It is concluded that cortical control of hypothalamic autonomic function is bilateral.
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Broe et al. (1970) studied this question.
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