Hyperbaric Oxygen for Carbon Monoxide Induced Chronic Encephalopathy

Carbon Monoxide Poisoning Clinical Trial

— HACMICE  

Official title:

Hyperbaric Oxygen for Carbon Monoxide Induced Chronic Encephalopathy

Clinical Trial Details — Status: Withdrawn

Administrative data

• NCT number: NCT04118491
• Other study ID #: 0225-18-FB
• Status: Withdrawn
• Phase: N/A
• Start date: July 2020
• Est. completion date: June 6, 2023

Study information

• Verified date: August 2023
• Source: University of Nebraska
• Contact: n/a
• Is FDA regulated: No
• Study type: Interventional

Clinical Trial Summary

In some patients, a few days or weeks after recovery from carbon monoxide poisoning, new symptoms develop. These can affect mood, ability to think or remember clearly, and movements. Some people develop movement problems that are similar to Parkinson's disease. This damage to brain tissue is called "encephalopathy," and this study will look at the effect of pressurized oxygen therapy on long term, or chronic, encephalopathy.

Description:

Carbon monoxide (CO) poisoning is a leading cause of unintentional poisoning deaths in the United States. After a period of apparent recovery, survivors of acute CO-poisoning can develop a potentially permanent neurologic deterioration (DNS). DNS is a rare, poorly known encephalopathy with a 25-50% prevalence among severely poisoned CO-poisoned patients. Its symptoms and signs range from subtle abnormalities to severe dementia, Parkinsonism, gait disturbances, mutism, and incontinence. Recovery from delayed neuropsychiatric syndrome occurs in 50-75% of patients within 1 year. However, this leaves 25-50% permanently impaired. Hyperbaric oxygen therapy (HBO2) is useful after acute poisoning to reduce the chance of developing DNS. However, appropriate therapy for DNS is widely debated; particularly, the role of hyperbaric oxygen therapy (HBO2) after DNS has developed is controversial. This study proposes to ascertain whether hyperbaric oxygen is efficacious in the treatment of chronic DNS brain injury from carbon monoxide (CO) poisoning. Ten participants suffering from DNS for longer than one year will be recruited to the study, which will be prospective, blinded, sham-controlled and crossover in design. Participants will be divided into two groups of five. One group will receive 40 HBO2 treatments [100% oxygen at twice normal air pressure (2 ATA)] followed by 40 sham HBO2 treatments [air at near normal pressure (1.2 ATA)]. Treatments will be done once daily for 2 hours, Monday through Friday. Neurological and psychologic assessments will be done prior to starting treatments, after each group of 40 treatments. The second group will be treated similarly except that they will receive sham treatments in the first and oxygen treatments second. In this manner, all participants will act as both experimental and control subject and will receive treatment which we believe is therapeutic.

Recruitment information / eligibility

• Status: Withdrawn
• Enrollment: 0
• Est. completion date: June 6, 2023
• Est. primary completion date: June 6, 2023
• Accepts healthy volunteers: No
• Gender: All
• Age group: 10 Years to 90 Years

Eligibility

Inclusion Criteria:

• CO induced neurological or cognitive sequelae assessed as at least mild (e.g. UPDRS part 3 (motor)>15).
• chronicity- signs or symptoms present for greater than one year after exposure.

Exclusion Criteria:

• age >90 or less than 10 years
• other morbidities which may contribute to chronic neurocognitive deficits (such as traumatic brain injury, poisoning by other toxins, other neurodegenerative diseases)
• pregnancy (if a subject becomes pregnant she will be removed from the study)
• routine contraindications to hyperbaric oxygen

Related Conditions & MeSH terms

• Brain Damage, Chronic
• Brain Diseases
• Carbon Monoxide Poisoning
• Chronic Encephalopathy
• Poisoning

Intervention

Device:
• hyperbaric oxygen and sham hyperbaric oxygen
see arm descriptions

Locations

Country	Name	City	State
n/a

Sponsors (1)

Lead Sponsor	Collaborator
University of Nebraska

Outcome

Type	Measure	Description	Time frame	Safety issue
Primary	Short Form (36) Health Survey	is a 36-item, patient-reported survey of patient health	4 months (after 80 treatments)
Secondary	Updrs part 3 (motor function)	Unified Parkinson Disease Rating Scale	0, 2 and 4 months: (prior to study, after 40 treatments and 80 treatments)
Secondary	BARS- Brief Ataxia Rating Scale	an assessment of ataxia, 30 point scale with 0 being normal	0, 2 and 4 months: (prior to study, after 40 treatments and 80 treatments)
Secondary	Fahn-Marsden Dystonia Rating Scale	an assessment of dystonia, 120 point scale with 0 being normal	0, 2 and 4 months: (prior to study, after 40 treatments and 80 treatments)
Secondary	Physician assessment	an assessment of global function, this is a verbal description not a scale	prior to study, after 40 treatments and 80 treatments (0, 2 and 4 months)
Secondary	The Montreal Cognitive Assessment	a brief cognitive screening tool for Mild Cognitive Impairment	0, 2 and 4 months: (prior to study, after 40 treatments and 80 treatments)
Secondary	Short Form (36) Health Survey	is a 36-item, patient-reported survey of patient health	0, 2 and 4 months: (prior to study, after 40 treatments and 80 treatments)