Effects of Baclofen on Presynaptic Inhibition in Humans

Status Withdrawn

Clinical Trial Summary

This study examines the role of the GABA-B receptor in long-lasting presynaptic inhibition of primary afferents in human participants. Participants will come in for two visits, receiving baclofen (a GABA-B receptor agonist) on one visit and a placebo during the other. Electro-physiological measures will be use during both visit to asses presynaptic inhibition.

Clinical Trial Description

The ability to execute purposeful movements relies on sensory information coming from the body. This sensory information tells us where are limbs are in relation to the rest of our body (posture sense), how fast they are moving (kinesthetic sense), how forcefully we are making a contraction (muscular sense) and if we are being contacted by external objects, changes in temperature, pain, etc (somatic sense). Without these senses, the investigators could not make well-controlled movements or navigate in our environment safely. Because of the importance of these sensory inputs, the nervous system has designed a highly regulated system to control the amount and quality of sensory inflow entering into both the spinal cord and brain. The investigators wish to re-investigate how sensory pathways from our body controls the inflow of sensory inputs in adults with and without neurological injury. Specifically, the investigators want to test if the long-lasting suppression of sensory inflow by other sensory nerves is regulated by GABA-B receptors. The investigators will test this by giving participants the GABA-B receptor agonist baclofen. Nerve stimulation and muscle responses will be used to understand how sensory transmission is being controlled in the spinal cord and the GABA-B receptors involvement. Results from these studies will provide important fundamental information about how normal sensory inflow is controlled so that the investigators can better understand how it may be altered after injury to the brain and spinal cord. This information will open new avenues of study into the treatment of sensory-related dysfunction such as spasticity and motor incoordination that occurs after central nervous system injury or disease. ;

Study Design

Related Conditions & MeSH terms

Clinical Trial Details

NCT number	NCT04471714
Study type	Interventional
Source	University of Alberta
Contact
Status	Withdrawn
Phase	Phase 2
Start date	January 10, 2020
Completion date	March 17, 2022

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Clinical trials are conducted in a series of steps, called phases - each phase is designed to answer a separate research question.

Phase 1: Researchers test a new drug or treatment in a small group of people for the first time to evaluate its safety, determine a safe dosage range, and identify side effects.
Phase 2: The drug or treatment is given to a larger group of people to see if it is effective and to further evaluate its safety.
Phase 3: The drug or treatment is given to large groups of people to confirm its effectiveness, monitor side effects, compare it to commonly used treatments, and collect information that will allow the drug or treatment to be used safely.
Phase 4: Studies are done after the drug or treatment has been marketed to gather information on the drug's effect in various populations and any side effects associated with long-term use.