An observational study in Post Acute Sequelae of SARS CoV 2 Infection and Obstructive Sleep Apnea, sponsored by VA Office of Research and Development. Recruiting at 1 site in United States. Open to participants aged 18 Years and older, including healthy volunteers. Per ClinicalTrials.gov, last updated 2026-01-23.
Sponsored by VA Office of Research and Development · Observational
The CDC describes Post-acute sequelae of SARS-COV-2 infection (PASC) for the wide range of physical and mental health consequences experienced by some patients. These sequelae may be present four or more weeks after SARS-COV-2 infection, including patients who had initial mild or asymptomatic acute infection. However, there is complete absence of data whether chronic sleep changes due to COVID-19 infection may influence these physical and mental health consequences. While fatigue is one of the common post-COVID conditions, there are no systematic examinations of sleep disturbances in COVID-19 survivors. This will be a pilot observational retrospective and prospective cohort study, to systematically assess if sleep disturbances and severity of sleep apnea comprise a modifiable facet of PASC as well as the short-term and longer-term effects of COVID-19 infection itself on sleep, cognitive function, exercise capacity and lung function.
This pilot study will systematically collect data to assess if sleep disturbances and severity of sleep apnea comprises a modifiable facet of PASC. This study will be the first step towards collecting preliminary data for a larger, longer-duration and more comprehensive study regarding the relationships between long-COVID and sleep disturbances which can inform future healthcare strategies and clinical decision-making. The study will also explore whether inflammatory biomarkers levels during acute COVID infection predict severity and duration of long-COVID or PASC and sleep fragmentation post-COVID.
Objectives: The overall goal of this project is to determine the associations between chronic post-COVID fatigue and sleep duration and sleep quality in patients after recovery from SARS-CoV-2 infection. The investigators have adopted the CDC definition for Post-COVID Conditions which persist for four or more weeks after SARS-CoV-2 infection and also is known as Post-Acute Sequelae of SARS-COV-2 infection (PASC).
Specific Aim 1: Determine associations between sleep duration and sleep quality on PASC-related fatigue symptoms, cognitive function, biomarker levels and vigilance.
Specific Aim 2. Determine if presence of obstructive sleep apnea (OSA) and level of PAP adherence during and prior to COVID-9 infection in patients with OSA predicts PASC- related fatigue, cognitive function and quality of life (QoL).
Exploratory Aim: Determine whether partial or full/booster vaccinations with COVID-19 mRNA vaccine vs. no vaccination has an impact on chronic post-COVID fatigue and sleep disturbances.
604 studies on the registry are indexed under Post-Acute COVID-19 Syndrome; 201 are open to participants now.
This study's planned enrollment of 200 is above the median of 150 across 173 observational studies indexed under Post-Acute COVID-19 Syndrome.
Browse Post-Acute COVID-19 Syndrome studies →VA Office of Research and Development is the lead sponsor of 1,771 studies on the registry; 392 are open to participants now.
Of its 213 completed or terminated interventional studies of FDA-regulated products, 185 (87%) have results posted.
Counted across the registry records on this site, refreshed daily.
The investigators will include all individuals 18 years or older, both genders, all racial and ethnic groups, with diagnosis of COVID-19 infection, diagnosed using any validated antigen detection test and/or polymerase chain reaction (PCR) test and of any severity level of COVID. Eligible patients with COVID-19 history of infection should be at least 1 month after the diagnosis of COVID-19 and should have been discharged to home if admitted to an acute care facility. COVID-19 antigen test positive patients who were completely asymptomatic at the time of COVID positive testing will be excluded. Controls will be patients without history of COVID-19 infection and age 18 years or older. In addition, patients with OSA (apnea hypopnea index = of 5/hour on polysomnography) with history of COVID-19 infection will be eligible for Aim 2.
Go through the criteria one by one — yes, no or not sure — and take the list to your doctor or the study team. Kept in this browser only.
Exclusion Criteria:
Patients with post-acute sequelae of SARS-COV-2 infection (PSAC) and obstructive sleep apnea (OSA)
Patients with obstructive sleep apnea and no history of COVID-19
Neurocognitive function Trails A and Trails B
Trails A and Trails B test will be administered to evaluate attention and psychomotor function. This score is adjusted for age, race, gender, and years of education. Scored on a Standard scale of 100 +/- 15 for normal ranges, above 115 is above average, below 85 is considered below average.
Time frame: Change from baseline at 3 months
Neurocognitive function PASAT
PASAT (Paced Auditory Serial Addition Test) will be administered to evaluate vigilance and executive function. The PASAT is recorded as the total number of correct responses (from 0-60), or the percent of correct responses out of 60 (from 0-100), where a higher value is a better outcome.
Time frame: Change from baseline at 3 months
Neurocognitive function Stroop color-word interference
Stroop color-word interference test will be administered to evaluate executive function. This score is adjusted for age, and years of education. Scored on a Standard scale of 100 +/- 15 for normal ranges, above 115 is above average, below 85 is considered below average.
Time frame: Change from baseline at 3 months
Neurocognitive function DIGIT
DIGIT test will be administered to evaluate short-term and working memory. This score is adjusted for age. Scored on a Standard scale of 100 +/- 15 for normal ranges, above 115 is above average, below 85 is considered below average.
Time frame: Change from baseline at 3 months
Neurocognitive function WASI
Abbreviated Wechsler Abbreviated Scale of Intelligence (WASI) will be administered to evaluate verbal comprehension and working memory. This score is adjusted for age. Scored on a Standard scale of 100 +/- 15 for normal ranges, above 115 is above average, below 85 is considered below average.
Time frame: Change from baseline at 3 months
Neurocognitive function WMS
Wechsler Memory test (WMS) will be administered to measure Verbal comprehension, and working and visual memory. Scored on a Standard scale of 100 +/- 15, where a higher score is a better outcome.
Time frame: Change from baseline at 3 months
Neurocognitive function PVT
Psychomotor Vigilance Test (PVT) will be administered to measure Alertness and vigilance, in terms of number of lapses and reaction time. The performance score ranges from 0-100, where a higher value is a better outcome.
Time frame: Change from baseline at 3 months
Neurocognitive function HVLT-R
Hopkins Verbal Learning Test - Revised (HVLT-R) will be administered to evaluate Verbal learning and memory. Scored on a Standard scale of 100 +/- 15, where a higher score is a better outcome.
Time frame: Change from baseline at 3 months
Sleepiness ESS
Epworth sleepiness scale (ESS) score will be measured. This score is on a scale of 0-24, where a higher value indicates greater degree of sleepiness.
Time frame: Change from baseline at 3 months
Sleep quality PSQI
Pittsburgh Sleep Quality Index (PSQI) is a detailed assessment of subject sleep quality over the most recent month by considering seven "component" scores: subjective sleep quality, sleep latency, sleep duration, habitual sleep efficiency, sleep disturbances, use of sleeping medication, and daytime dysfunction. The sum of scores for these seven components yields one global score to assess sleep quality on a scale of "poor" to "good".
Time frame: Change from baseline at 3 months
Quality of life SF-36v2
QoL will be assessed using the survey SF-36v2 Health survey. Thirty-five of the SF-36v2 items are used to measure eight domains of health-related quality of life. These are on a scale of 0-100, where higher values indicate a better outcome.
Time frame: Change from baseline at 3 months
Quality of life FOSQ
Disease specific QoL will be assessed using the Functional Outcomes of Sleep Questionnaire FOSQ/(FOSQ). There are 5 subscale domains of the FOSQ (General Productivity, Social Outcome, Activity Level, Vigilance, and Intimate Relationships and Sexual Activity). There all range from 0-20, where a higher value is a better outcome. The total FOSQ is the sum of these subscale domains and ranges from 0-100, where a higher value is a better outcome.
Time frame: Change from baseline at 3 months
Quality of life SGRQ
Disease specific QoL will be assessed using the St. George's Respiratory Questionnaire (SGRQ). The SGRQ has three subscale domains (Symptoms, Activity, and Impacts), which range from 0-100, where a higher value indicates a worse outcome. The total SGRQ is the average of these subscale domains and is on a scale of 0-100, where a higher value is a worse outcome.
Time frame: Change from baseline at 3 months
Fatigue Severity
Fatigue Severity Scale (FSS): FSS measures how fatigue affects motivation, exercise, physical functioning, carrying out duties, interfering with work, family, or social life. Where a higher value is a worse outcome.
Time frame: Change from baseline at 3 months
PROMISE Sleep Disturbance
Sleep disturbance short form assesses sleep disturbance over the past seven days.
Time frame: Change from baseline at 3 months
Horne and Osteberg Morningness/Eveningness Questionnaire
Morningness/Eveningness Questionnaire measures the degree of which respondents are active and alert at certain times of the day. Scale is 1 to 5.
Time frame: Change from baseline at 3 months
Mini Mental State Examination (MMSE)
Mini Mental State Examination (MMSE) is a simple way to quantify cognitive function and screen for cognitive loss. This score is on a scale of 0-30, a larger value is a better outcome.
Time frame: Change from baseline at 3 months
Borg Scale
This measures the level of dyspnea during the 6 minute walk test. It is on a scale of 0-10, where a larger value is a worse outcome.
Time frame: Change from baseline at 3 months
Dyspnea: Six-minute walk test (6MWT) distance
Participants are instructed to achieve maximal distance. There is no scale, but a larger value is a better outcome.
Time frame: Change from baseline at 3 months
Plan to share: No
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