Distribution of Ventilation, Respiratory Drive and Gas Exchange: Measurements and Monitoring

Study Results

Results pending

The study team has not published outcome measurements, participant flow, or safety data for this trial yet. Check back later for updates.

Basic Information

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Recruitment Status

ENROLLING_BY_INVITATION

Total Enrollment

40 participants

Study Classification

OBSERVATIONAL

Study Start Date

2022-07-19

Study Completion Date

2026-12-30

Brief Summary

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Respiratory physiology involves a complex interplay of elements including control of breathing, respiratory drive, pulmonary mechanics, distribution of ventilation and gas exchange. Body position may also play an important role in respiratory mechanics. While effective methods exist for measuring these variables, they are typically measured in isolation rather than in combination. In pulmonary disease, decreasing mechanical stress and strain and optimizing transpulmonary pressure or the distending pressure across the lung, minimizing overdistention and collapse are central to clinical management. Obesity has a significant impact on pulmonary mechanics and is a risk factor for obstructive sleep apnea (OSA). However, our understanding of these elements is limited even in the general population. The investigators plan to use various validated methods to assess control of breathing, respiratory drive, distribution of ventilation and gas exchange to obtain a better understanding of underlying physiologic signatures in patients with and without obesity and the role of posture/position, with a secondary analysis comparing participants with and without obstructive sleep apnea.

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Detailed Description

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Conditions

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Pulmonary Disease Respiratory System Abnormalities OSA Respiratory Failure

Study Design

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Observational Model Type

COHORT

Study Time Perspective

PROSPECTIVE

Study Groups

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BMI>24.9 kg/m2

Position change

Intervention Type OTHER

Distribution of ventilation, respiratory drive, pulmonary mechanics and gas exchange will be measured in 3 unique positions: prone, head of bed (HOB) flat (i.e. 0 degrees) and HOB elevated (i.e. 30 degrees).

BMI 18-24.9 kg/m2

Position change

Intervention Type OTHER

Distribution of ventilation, respiratory drive, pulmonary mechanics and gas exchange will be measured in 3 unique positions: prone, head of bed (HOB) flat (i.e. 0 degrees) and HOB elevated (i.e. 30 degrees).

Interventions

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Position change

Distribution of ventilation, respiratory drive, pulmonary mechanics and gas exchange will be measured in 3 unique positions: prone, head of bed (HOB) flat (i.e. 0 degrees) and HOB elevated (i.e. 30 degrees).

Intervention Type OTHER

Eligibility Criteria

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Inclusion Criteria

* 18 years or older
* Non-smokers

Exclusion Criteria

* \<18 years old
* Significant history of pulmonary disease
* Chest wall, anatomical, physical abnormalities, skin integrity issues precluding placement of electrode belt in direct contact with skin
* Skin integrity issues precluding placement of nose clips, or transcutaneous carbon dioxide monitoring
* Inability to form a seal around a mouthpiece
* Known esophageal strictures, webs, or varices (if esophageal manometry to be included)
* Known platelet count \< 100,000 (if esophageal manometry to be included)
* On therapeutic anticoagulation (if esophageal manometry to be included)
* Known multidrug resistant (MDR) pulmonary infection
* Non-English language speakers
* Chronic hypoxemic respiratory failure
* Confirmed or suspected intracranial bleed, stroke, edema
* Active implants (i.e. implantable electronic devices such as pacemakers, cardioverter defibrillators or neurostimulators) or if device compatibility is in doubt
* Pregnant or lactating patients as safety and efficacy for use of EIT in such cases has not been verified

Minimum Eligible Age

18 Years

Eligible Sex

ALL

Accepts Healthy Volunteers

Yes