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Due to de-centralized cardiovascular control, persons with spinal cord injury (SCI) experience blood pressure (BP) dysregulation which manifests in chronic hypotension with exacerbation during orthostatic positioning. Although many individuals with SCI remain asymptomatic to hypotension and orthostatic hypotension (OH), we recently reported reduced memory and marginally reduced attention and processing speed in hypotensive individuals with SCI compared to a normotensive cohort. Thus, we believe that treatment of overtly asymptomatic hypotension and OH in the SCI population is clinically warranted. Currently the FDA has approved only midodrine hydrochloride for the treatment of dizziness associated with OH and proof of efficacy is limited. Acetylcholinesterase inhibition for treatment of OH is a novel concept and has gained recent recognition in models of neurogenic OH (multiple system atrophy; pure autonomic failure, diabetic neuropathy). The physiological rationale of this concept is unique: acetylcholine (AcH) is the pre-ganglionic neurotransmitter of the sympathetic nervous system. Inhibition of acetylcholinesterase will limit the breakdown of AcH thereby facilitating vascular adrenergic tone and peripheral vasoconstriction. Acetylcholinesterase inhibition has been reported to be efficacious in models of both pre-ganglionic (multiple system atrophy) and post-ganglionic (pure autonomic failure, diabetic neuropathy) origin and persons with SCI reflect a model of a preganglionic disorder. In theory, if an individual has a complete autonomic lesion, acetylcholinesterase inhibition would not be expected to improve orthostatic BP because little/no neural traffic would be transmitted to the pre-synapse. However, individuals with an incomplete autonomic lesion may benefit from this class of agent. Researchers are currently investigating the orthostatic BP effects of acetylcholinesterase inhibition with pyridostigmine bromide (60 mg) in 10 individuals with SCI.
Due to de-centralized cardiovascular control, persons with spinal cord injury (SCI) experience blood pressure (BP) dysregulation which manifests in chronic hypotension with exacerbation during orthostatic positioning. Although many individuals with SCI remain asymptomatic to hypotension and orthostatic hypotension (OH), we recently reported reduced memory and marginally reduced attention and processing speed in hypotensive individuals with SCI compared to a normotensive cohort. Thus, we believe that treatment of overtly asymptomatic hypotension and OH in the SCI population is clinically warranted. Currently the FDA has approved only midodrine hydrochloride for the treatment of dizziness associated with OH and proof of efficacy is limited. Acetylcholinesterase inhibition for treatment of OH is a novel concept and has gained recent recognition in models of neurogenic OH (multiple system atrophy; pure autonomic failure, diabetic neuropathy). The physiological rationale of this concept is unique: acetylcholine (AcH) is the pre-ganglionic neurotransmitter of the sympathetic nervous system. Inhibition of acetylcholinesterase will limit the breakdown of AcH thereby facilitating vascular adrenergic tone and peripheral vasoconstriction. Acetylcholinesterase inhibition has been reported to be efficacious in models of both pre-ganglionic (multiple system atrophy) and post-ganglionic (pure autonomic failure, diabetic neuropathy) origin and persons with SCI reflect a model of a preganglionic disorder. In theory, if an individual has a complete autonomic lesion, acetylcholinesterase inhibition would not be expected to improve orthostatic BP because little/no neural traffic would be transmitted to the pre-synapse. However, individuals with an incomplete autonomic lesion may benefit from this class of agent. Researchers are currently investigating the orthostatic BP effects of acetylcholinesterase inhibition with pyridostigmine bromide (60 mg) in 10 individuals with SCI. The primary objectives of this study are to compare the BP response to head-up tile (HUT: 45°) between no-drug and drug (pyridostigmine 60 mg) in individuals with SCI with documented OH; and to compare the orthostatic BP responses following drug in individuals with SCI.
Subjects will be tested on two separate days. On day 1 of testing, subjects will be transferred onto a tilt table and will remain in the supine position for the entirety of the test. During the first 60 minutes the subject will remain at the resting supine position.
Following the 60 minute resting position, a progressive head-up tilt will be utilized in which the table will be adjusted to 15°, 25°, 35° for 5 minutes at each angle and then maintained at 45° for 45 minutes or until the subjects experiences symptoms of compromised cerebral blood flow, which include, but are not limited to, light headedness, blurry vision, dizziness and nausea.
On day 2 of testing, the protocol will be duplicated with the exception of drug administration. 60 mg of the study drug, pyridostigmine will be administered at the 30 minute mark of the resting supine position. Data for heart rate and blood pressure will be monitored continuously during the progressive HUT maneuver and will be recorded at 10 minute intervals during the 45° HUT.
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| Label | Type | Description | Intervention Names |
|---|---|---|---|
| Spinal Cord Injury | Experimental | After being transferred onto a tilt table, subject with complete SCI will lie in a rested, supine position in which the study drug, pyridostigmine bromide (60 mg) will be administered at the 30 minute time point. Following the administration of the study drug, the subject will remain in the supine position for an additional 30 minutes until the tilting protocol commences. |
|
| Name | Type | Description | Arm Group Labels | Other Names |
|---|---|---|---|---|
| Pyridostigmine Bromide | Drug | After being transferred onto a tilt table, subject will lie in a rested, supine position in which the study drug, pyridostigmine bromide will be administered at the 30 minute time point. Following the administration of the study drug, the subject will remain in the supine position for an additional 30 minutes until the tilting protocol commences. |
| Measure | Description | Time Frame |
|---|---|---|
| Systolic Blood Pressure | Average systolic blood pressure of 10 minutes supine rest before pyridostigmine and after 45 minutes at 45 degrees after pyridostigmine administration compared to 10 minutes supine rest before tilt and at 45 degrees during no-drug head-up tilt maneuver. | |
| Diastolic Blood Pressure | Average diastolic blood pressure of 10 minutes supine rest before pyridostigmine and after 45 minutes at 45 degrees after pyridostigmine administration compared to 10 minutes supine rest before tilt and at 45 degrees during no-drug head-up tilt maneuver. | |
| Heart Rate | Average heart rate of 10 minutes supine rest before pyridostigmine and after 45 minutes at 45 degrees following pyridostigmine administration compared to 10 minutes supine rest before tilt and at 45 degrees during no-drug head-up tilt maneuver. |
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Inclusion Criteria:
Exclusion Criteria:
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| Name | Affiliation | Role |
|---|---|---|
| Jill M. Wecht, EdD | James J. Peters VAMC | Principal Investigator |
| Facility | Status | City | State | ZIP | Country | Contacts |
|---|---|---|---|---|---|---|
| Kessler Institute for Rehabilitation | West Orange | New Jersey | 07052 | United States |
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| ID | Title | Description |
|---|---|---|
| FG000 | Spinal Cord Injury | 10 individuals with spinal cord injury (SCI: C4-C7) were recruited. |
| Title | Milestones | Reasons Not Completed | ||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Day 1 - No Drug |
| |||||||||||||
| Day 2 - 60 mg of Pyridostigmine |
|
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| ID | Title | Description |
|---|---|---|
| BG000 | Spinal Cord Injury | Ten individuals with SCI (C4-C7) were recruited. |
| Units | Counts |
|---|---|
| Participants |
|
| Title | Description | Population Description | Parameter Type | Dispersion Type | Unit of Measure | Calculate Percentage | Denominator Units Selected | Denominators | Classes |
|---|---|---|---|---|---|---|---|---|---|
| Age, Categorical | Count of Participants |
| Type | Title | Description | Population Description | Reporting Status | Anticipated Posting Date | Parameter Type | Dispersion Type | Unit of Measure | Calculate Percentage | Time Frame | Units Analyzed | Denominator Units Selected | Arm/Group Information | Denominators | Classes | Analyses | ||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Primary | Systolic Blood Pressure | Posted | Mean | Standard Deviation | mm Hg | Average systolic blood pressure of 10 minutes supine rest before pyridostigmine and after 45 minutes at 45 degrees after pyridostigmine administration compared to 10 minutes supine rest before tilt and at 45 degrees during no-drug head-up tilt maneuver. |
|
80 minuets after pyridostigmine administration to 200 minuets after pyridostigmine administration.
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| ID | Title | Description | Deaths (Affected) | Deaths (At Risk) | Serious Events (Affected) | Serious Events (At Risk) | Other Events (Affected) | Other Events (At Risk) |
|---|---|---|---|---|---|---|---|---|
| EG000 | Day 1 - No Drug | Following the 60 minute resting position, a progressive head-up tilt will be utilized in which the table will be adjusted to 15°, 25°, 35° for 5 minutes at each angle and then maintained at 45° for 45 minutes or until the subjects experiences symptoms of compromised cerebral blood flow, which include, but are not limited to, light headedness, blurry vision, dizziness and nausea. |
| Term | Organ System | Source Vocabulary | Assessment Type | Notes | Statistical Information |
|---|---|---|---|---|---|
| Drug Side Effect | Nervous system disorders | Systematic Assessment | One participant reported increased sweating and salivation following pyridostigmine administration. |
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| Title | Organization | Phone | Extension | |
|---|---|---|---|---|
| Jill M. Wecht | James J. Peters VA Medical Center | 7185849000 | 3122 | jm.wecht@va.gov |
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| ID | Term |
|---|---|
| D007024 | Hypotension, Orthostatic |
| ID | Term |
|---|---|
| D054971 | Orthostatic Intolerance |
| D054969 | Primary Dysautonomias |
| D001342 | Autonomic Nervous System Diseases |
| D009422 | Nervous System Diseases |
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| ID | Term |
|---|---|
| D011729 | Pyridostigmine Bromide |
| D018667 | Tilt-Table Test |
| ID | Term |
|---|---|
| D011726 | Pyridinium Compounds |
| D011725 | Pyridines |
| D006573 | Heterocyclic Compounds, 1-Ring |
| D006571 | Heterocyclic Compounds |
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| Tilt table test | Device | After 60 minutes in supine resting position, a progressive head-up tilt will be utilized in which the table will be adjusted to 15°, 25°, 35° for 5 minutes at each angle and then maintained at 45° for 45 minutes or until the subjects experiences symptoms of compromised cerebral blood flow, which include, but are not limited to, light headedness, blurry vision, dizziness and nausea. |
|
|
| Participants |
|
| Age, Continuous | Mean | Standard Deviation | years |
|
| Sex: Female, Male | Count of Participants | Participants |
|
| Region of Enrollment | Number | participants |
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| Primary | Diastolic Blood Pressure | Posted | Mean | Standard Deviation | mm Hg | Average diastolic blood pressure of 10 minutes supine rest before pyridostigmine and after 45 minutes at 45 degrees after pyridostigmine administration compared to 10 minutes supine rest before tilt and at 45 degrees during no-drug head-up tilt maneuver. |
|
|
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| Primary | Heart Rate | Posted | Mean | Standard Deviation | bpm | Average heart rate of 10 minutes supine rest before pyridostigmine and after 45 minutes at 45 degrees following pyridostigmine administration compared to 10 minutes supine rest before tilt and at 45 degrees during no-drug head-up tilt maneuver. |
|
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|
| 0 |
| 10 |
| 0 |
| 10 |
| EG001 | Day 2 - Pyridostigmine Bromide | After being transferred onto a tilt table, subject will lie in a rested, supine position in which the study drug, pyridostigmine bromide 60 mg will be administered at the 30 minute time point. Following the administration of the study drug, the subject will remain in the supine position for an additional 30 minutes until the tilting protocol commences. | 2 | 10 | 0 | 10 |
|
| Overheating | Nervous system disorders | Systematic Assessment | One subject terminated head-up tilt intervention due to overheating. |
|
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| D007022 | Hypotension |
| D014652 | Vascular Diseases |
| D002318 | Cardiovascular Diseases |
| D003935 |
| Diagnostic Techniques, Cardiovascular |
| D019937 | Diagnostic Techniques and Procedures |
| D003933 | Diagnosis |