Ventilatory and Perfusion Abnormalities in Individuals With Post-Acute Sequelae of SARS-CoV-2 Infection

Study Purpose

Prospective cohort study to evaluate the utility of quantitative CT analysis to assess ventilation and perfusion defects in patients with Post-acute Sequelae of SARS-CoV-2 (PASC) and functional limitations

Recruitment Criteria

Accepts Healthy Volunteers

Healthy volunteers are participants who do not have a disease or condition, or related conditions or symptoms

Study Type

An interventional clinical study is where participants are assigned to receive one or more interventions (or no intervention) so that researchers can evaluate the effects of the interventions on biomedical or health-related outcomes.

An observational clinical study is where participants identified as belonging to study groups are assessed for biomedical or health outcomes.

Searching Both is inclusive of interventional and observational studies.

Eligible Ages 18 Years - 99 Years
Gender All
More Inclusion & Exclusion Criteria

Inclusion Criteria:

  • - Age ≥ 18.
  • - Self-reported or documented SARS-CoV-2 infection by RT-PCR or Antigen testing > 3 months ago or no previous history of SARS-CoV-2 infection (control group only) - Normal or mild abnormalities on baseline Pulmonary Function Tests (PFTs) - New or worsening symptoms of chronic fatigue, dyspnea or exercise intolerance after COVID-19 with otherwise unclear etiology (PASC group only)

    Exclusion Criteria:

    - SARS-CoV-2 infection by RT-PCR or Antigen testing within the last 3 months.
  • - Inability to provide consent or non-English speaking.
  • - Pregnancy.
  • - Any respiratory infection in last 4 weeks.
  • - PFT relative contraindications.
  • - History of major cardiovascular, pulmonary, renal, hepatic, autoimmune or neuromuscular disease including asthma, COPD, interstitial lung disease, heart failure, pulmonary arterial hypertension, or prior pulmonary embolism.
- Active malignancy undergoing treatment or history of malignancy involving the lung

Trial Details

Trial ID:

This trial id was obtained from, a service of the U.S. National Institutes of Health, providing information on publicly and privately supported clinical studies of human participants with locations in all 50 States and in 196 countries.


Phase 1: Studies that emphasize safety and how the drug is metabolized and excreted in humans.

Phase 2: Studies that gather preliminary data on effectiveness (whether the drug works in people who have a certain disease or condition) and additional safety data.

Phase 3: Studies that gather more information about safety and effectiveness by studying different populations and different dosages and by using the drug in combination with other drugs.

Phase 4: Studies occurring after FDA has approved a drug for marketing, efficacy, or optimal use.

Lead Sponsor

The sponsor is the organization or person who oversees the clinical study and is responsible for analyzing the study data.

Tufts Medical Center
Principal Investigator

The person who is responsible for the scientific and technical direction of the entire clinical study.

Principal Investigator Affiliation N/A
Agency Class

Category of organization(s) involved as sponsor (and collaborator) supporting the trial.

Other, Industry
Overall Status Enrolling by invitation
Countries United States

The disease, disorder, syndrome, illness, or injury that is being studied.

Post-Acute COVID-19, Post COVID-19 Condition, Post Viral Fatigue, Dyspnea
Additional Details

This is a study to describe the overall pattern of lung ventilation and perfusion defects in individuals with PASC. Subjects with PASC with a documented history of COVID-19 and persistent symptoms of fatigue, dyspnea, and/or exercise intolerance will complete questionnaires, and undergo pulmonary function tests, 6-minute walk tests, and a low dose CT chest to describe the overall pattern of lung regional ventilation and blood distribution and to compare this pattern to asymptomatic controls with and without prior COVID-19.

Arms & Interventions


: Post-Acute Sequelae of SARS-CoV-2 (PASC) Group

Subjects with PASC with a documented history of COVID-19 and persistent symptoms of fatigue, dyspnea, and/or exercise intolerance

: Control: Fully recovered COVID-19

Subjects with a history of COVID-19 who have fully recovered from COVID-19 with no post-acute sequelae of SARS-Cov-2

: Control: No history of COVID-19

Healthy subjects without a documented history of COVID-19, no current symptoms, and a normal baseline High resolution CT of the chest


Diagnostic Test: - Computed Tomography of the Chest

Quantitative Computed Tomography of the chest in the inspiratory and expiratory phases will be performed to assess regional lung ventilation as well as pulmonary vascular volume and distribution

Contact a Trial Team

If you are interested in learning more about this trial, find the trial site nearest to your location and contact the site coordinator via email or phone. We also strongly recommend that you consult with your healthcare provider about the trials that may interest you and refer to our terms of service below.

Tufts Medical Center, Boston, Massachusetts



Tufts Medical Center

Boston, Massachusetts, 02111