Clinical trial NCT02865642: Cortical Ischemic Stroke and Serotonin
Official title: CISS: Cortical Ischemic Stroke and Serotonin - Effects of Serotonergic Neuromodulation on Behavioural Recovery and Motor Network Plasticity After Cortical Ischemic Stroke: a Longitudinal, Placebo-controlled Study
Study type: INTERVENTIONAL
Overall status: UNKNOWN
Phase: PHASE2
Conditions: Stroke
Keywords: Stroke
Serotonin
Hand Paresis
Lead sponsor: Insel Gruppe AG, University Hospital Bern
Sponsor class: OTHER
Collaborators: name: Cantonal Hospital of St. Gallen
First posted: 2016-08-12
Enrollment: 90
Sex: ALL
Minimum age (years): 18
Standard ages: ADULT
OLDER_ADULT
Accepts healthy volunteers: yes
Allocation: RANDOMIZED
Intervention model: PARALLEL
Primary purpose: SUPPORTIVE_CARE

Brief summary: In this study the investigators want to test the hypotheses that, serotonergic neuromodulation increases perilesional neuroplasticity, leading to improved behavioural outcomes through a more efficient allocation of functional resources, greater structural reorganization and less remapping via alternative circuits.

Detailed description: Neuroplasticity, i.e. the human brain's innate capacity to structurally remodel and functionally reorganize its neural networks, is essential for recovery of impaired sensorimotor function after focal ischemic injury. However, the potential for spontaneous recovery in the adult brain is limited and needs to be augmented through rehabilitative programs, e.g. intensive exercise, brain stimulation or pharmacologic neuromodulation.

Clinical studies have shown that post-stroke recovery can be augmented by long-term administration of selective serotonin reuptake inhibitors (SSRI). Serotonin modulates excitatory glutamatergic neurotransmission and induces long-term potentiation (LTP), an important mediator of neuroplasticity that supports sensorimotor learning in the healthy brain and reorganization in the post-stroke perilesional cortex. Preliminary data indicate that a single dose of the SSRI Escitalopram is sufficient to induce LTP-like effects in the motor cortex of healthy volunteers (measured by repetitive transcranial magnetic stimulation (rTMS)), and to increase the efficiency of large-scale functional connectivity networks engaged in tactile object manipulation ( measured with functional magnetic resonance imaging (fMRI)).

The investigators thus hypothesize that serotonergic neuromodulation might enhance post-stroke recovery through enlarged plasticity and processing efficiency along integrated neuronal networks, leading to reinforced connectivity and behavioural performance.

To test this hypothesis, the investigators aim to conduct a longitudinal, double blind, placebo-controlled trial in two neurological centers. The investigators aim to test the effect of a daily-administered single dose of Escitalopram over a three months period after cortical ischemic stroke to promote plasticity changes in the perilesional zone of primary sensorimotor cortices (S1 and M1). The investigators will apply behavioural measures of hand function, rTMS and advanced magnetic resonance (MR) imaging techniques as outcome variables.

The investigators will measure hand function kinematics with a data glove to better understand the contribution of effort to hand function recovery and brain activation. Moreover, the investigators intend to apply MR-Spectroscopy of the perilesional premotor cortex, guided by real-time fMRI analysis, as a tool to assess local glutamatergic transmission. Measurements of plasma drug levels and determination of genetic polymorphisms of the Escitalopram-metabolizing genes will help them to assess and control for interindividual variance in Escitalopram bioavailability.

The investigators expect that SSRI-augmented neuroplasticity will lead to increased efficiency in the allocation of neuronal resources in the post-stroke brain, resulting in more precise and less effortful movements, facilitation of LTP-like phenomena, increased grey matter volume of spared perilesional premotor cortex and possibly higher glutamate peaks in the same areas, as compared to placebo treatment.

By combining standard and innovative methods, this study will provide mechanistic insight into the processes that drive cortical neuroplasticity in the post-stroke human brain. From a clinical perspective, results from the study are expected to provide a scientific rationale to select patients that might benefit from SSRI-augmented neurorehabilitation.

Eligibility criteria: Inclusion Criteria:

* First-ever stroke
* Clinically significant contralesional hand plegia or paresis as a main symptom
* Involvement of the pre-and/or postcentral gyri confirmed on diffusion-weighted (DWI) and fluid attenuated inversion recovery (FLAIR) scans.
* Written informed consent

Exclusion Criteria:

* Aphasia or cognitive deficits severe enough to preclude understanding of study purposes
* Prior cerebrovascular events
* Significant stenosis (70-99% according to NASCET) or occlusion of the carotid and intracranial arteries on MR-angiography
* Purely subcortical stroke
* Known brain lesion (tumour, old cerebral haemorrhage)
* Other medical conditions interfering with task performance or SSRI-treatment, specifically: prolonged corrected QT interval (QTc) on electrocardiogram, ongoing drug / alcohol abuse
* Simultaneous intake of medications which can lead to prolonged QTc syndrome known or or suspected hypersensitivity (allergic) to one of the ingredients of Cipralex® or Placebo
* Simultaneous administration of: antidepressants, irreversible non- selective Monoamine Oxidase (MAO) inhibitors, reversible selective MAO inhibitors, reversible non-selective MAO inhibitors, irreversible selective MAO inhibitors, N-methyl-D-aspartate(NMDA)-receptor antagonists/-agonists, dopamine antagonists/-agonists, levodopa, benzodiazepines, amphetamines, methylphenidate, foscarnet, ganciclovir, ritonavir, mianserin, chloroquine, mefloquine, imipenem, penicillin, ampicillin, cephalosporins, metronidazole, isoniazid, levofloxacin, cyclosporin, chlorambucil, vincristine, methotrexate, cytosine arabinoside, lithium, anticholinergics,systemic antihistamines, systemic sympathomimetics
* Conditions interfering with MRI such as patients with magnetic (metallic) particles in the scull or brain, patients with a cardiac pacemaker, deep brain stimulators or cochlear implant.
* Women who are pregnant or breastfeeding
* Women in childbearing age without sufficient birth control (at least 2 contraceptive methods)

Eligibility Criteria for healthy volunteers:

* Normal test-scores at the baseline visit (see section 5.2.2)
* Normal neurological status
* No known brain lesion
* No pregnancy
* Written informed consent

Primary outcomes:
measure: Effect of escitalopram on sensorimotor network
timeFrame: fMRI at month 9
Secondary outcomes:
measure: Imaging patterns of rs-fMRI
timeFrame: rs-fMRI (baseline, month 3, month 9)
measure: Imaging patterns of act-fMRI
timeFrame: act-fMRI, performance of tactile manipulation of objects (baseline, month 3, month 9)
measure: Jebsen-Taylor Test (JTT)
timeFrame: JTT, monthly from baseline to month 9
measure: Mean cortical volume changes
timeFrame: T1 from baseline, month 3, month 9
measure: Serum concentration of escitalopram
timeFrame: Serum concentration at month 3
measure: Genetic polymorphisms in genes
timeFrame: Genetic polymorphisms in genes at month 3
Other outcomes:
measure: Glutamate/Glutamine concentration
timeFrame: Spectroscopy at baseline, month 3, month 9
measure: rTMS
timeFrame: TMS at baseline, month 3, month 9
measure: Number of adverse events due to study medication
timeFrame: Baseline, monthly until month 9
Locations:
city: St. Gallen
country: Switzerland
facility: Neurology Department Kantonsspital St. Gallen
state: Saint Gallen
city: Bern
country: Switzerland
facility: Support Center of Advanced Neuroimaging Institute for Diagnostic and Interventional Neuroradiology Inselspital, University Hospital Bern
Study officials:
affiliation: Support Center of Advanced Neuroimaging Institute for Diagnostic and Interventional Neuroradiology Inselspital, University Hospital Bern
name: Roland Wiest
role: PRINCIPAL_INVESTIGATOR
affiliation: Neurology Department Kantonsspital St. Gallen
name: Georg Kägi
role: PRINCIPAL_INVESTIGATOR
References:
citation: Krammer W, Missimer JH, Habegger S, Pastore-Wapp M, Wiest R, Weder BJ. Sensing form - finger gaiting as key to tactile object exploration - a data glove analysis of a prototypical daily task. J Neuroeng Rehabil. 2020 Oct 8;17(1):133. doi: 10.1186/s12984-020-00755-6.