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Cyproheptadine and Chlorpromazine Effects on Spasticity

Spinal Cord Injuries Clinical Trial

Official title:
Phase 3 Study of Cyproheptadine and Chlorpromazine Effects on Spasticity After Spinal Cord Injury

Clinical Trial Summary

The main goal of this research is to understand the neuronal mechanisms that mediate the development of spasticity and motor dysfunction after spinal cord injury. The investigators examine how neurons and neuronal circuits in an injured nervous system adapt to produce the uncontrolled and unwanted muscle contractions that affect the majority (80%) of patients with spinal cord injury. One of the neurons that the investigators study is the motoneuron that excites the muscles of the limbs to produce movement. Previously, the investigators have shown that after spinal cord injury, the excessive and uncontrolled activity of motoneurons during muscle spasms is mediated, in large part, by the activation of calcium currents in the human motoneuron. In human patients the investigators have used recordings from single muscle fibres to estimate the contribution of these calcium currents in activating the motoneuron during muscle spasms. In this proposal, the investigators study why motoneurons recover these calcium currents and self-sustained activity after chronic spinal cord injury. Because the calcium currents require the presence of the monoamine serotonin (5HT) to activate, and this monoamine is greatly reduced after injury, the investigators examine if the calcium currents recover because the 5HT receptors become spontaneously active without the need for 5HT to bind to the receptor, which the investigators hypothesize to be one of the causes of spasticity after spinal cord injury. This research will pave the way to develop new pharmacological and rehabilitative therapies to both control spasticity after spinal cord injury and augment residual motor movements.

Clinical Trial Description

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Study Design

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Related Conditions & MeSH terms

Clinical Trial Details
NCT number NCT01509885
Study type Observational
Source University of Alberta
Contact
Status Completed
Phase N/A
Start date July 2010
Completion date November 2012
View Details
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