Effect of a Bolus of Clonidine Systemically Administered on the Excitability of the Spinal Motoneurons of the Lower Extremity

  • End date
    Dec 24, 2022
  • participants needed
  • sponsor
    Queen Fabiola Children's University Hospital
Updated on 24 January 2021


The purpose of this study is to assess the effect of IV clonidine administration on lower limb spinal motoneuron excitability during standardized total intravenous anesthesia (propofol and remifentanil).


According to the literature data, intraoperative administration of clonidine reduces the need for morphine per and postoperative and thus reduces the side effects associated related to their administration.

Nevertheless, on the basis of current knowledge, clonidine may disrupt some electrophysiological measures required for the intraoperative monitoring of surgeries with a high risk of neurological complications.

For such surgery, anaesthesiologists are led to inject clonidine after surgery, at a time when the electrophysiological measures are no longer needed, which limits the benefit in terms of intraoperative morphine savings.

Whith this study, investigators would like to investigate if an early administration of clonidine in patients aged 6 to 16 years undergoing ear surgery disturbs excitability of the spinal motor neuron.

The choice of the study population is justified by the fact that the ear surgery does not require electrophysiological monitoring and it is carried out under conditions similar to that of anesthesia of scoliosis corrective surgery for which electrophysiological measurements are essential for the prevention of neurological complications.

Observations will allow investigators to determine therefore whether early administration of clonidine is possible at high risk of neurological complications surgeries for which electrophysiological monitoring is essential.

Condition Analgesia, Intraoperative Neurophysiological Monitoring, pain management, pain control, pain relieving, managed pain, pain therapy, intraoperative neurophysiologic monitoring
Treatment Clonidine hydrochloride, Clonidine hydrochloride, Single bolus of physiologic sodium chloride serum administered IV after induction and obtaining a stable anaesthetic level
Clinical Study IdentifierNCT02592915
SponsorQueen Fabiola Children's University Hospital
Last Modified on24 January 2021


Yes No Not Sure

Inclusion Criteria

Patients aged 6 to 18 years at time of hospital admission
Planned hospital admission for tympanoplasty
Informed Consent signed by both parents

Exclusion Criteria

Known hypersensitivity to clonidine or to any component of the Catapressan
Patient treated with alpha2 agonists
Surgical emergency
Patient treated with antipsychotic drugs(butyrophenone, phenothiazine, tricyclic antidepressant)
Abnormal heart rhythms
Neuromuscular disease
Renal impairment
Patient treated with methylphenidate
Pregnant or breastfeeding woman
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