Ignite Creation Date:
2025-12-25 @ 12:04 AM
Ignite Modification Date:
2025-12-31 @ 4:42 PM
Study NCT ID:
NCT04662658
Status:
RECRUITING
Last Update Posted:
2020-12-10
First Post:
2020-11-02
Is NOT Gene Therapy:
True
Has Adverse Events:
False
Brief Title:
Hyperpolarized Xenon-129 MR Imaging of the Lung
Sponsor:
University of Virginia
Organization:
Study Overview
Official Title:
Hyperpolarized Xenon-129 MR Imaging of the Lung:E-cigarette Sub-study
Status:
RECRUITING
Status Verified Date:
2020-12
Last Known Status:
None
Delayed Posting:
No
If Stopped, Why?:
Not Stopped
Has Expanded Access:
False
If Expanded Access, NCT#:
N/A
Has Expanded Access, NCT# Status:
N/A
Acronym:
e-cigarette
Brief Summary:
Over the past 10 years, electronic cigarettes (e-cigarettes, EC) have been commercialized as a "less harmful" alternative to traditional cigarettes.1,2 However, e-cigarettes are believed to cause pulmonary epithelial, endothelial and vascular dysfunction, and to cause murine phenotypes similar to those of human COPD. Recently, "spiked" vape juice has been linked to severe lung damage. Unfortunately, the effects of e-cigarettes on the human lungs are still poorly understood, especially in healthy young adults. Therefore, establishing the health effects of e-cigarettes in humans is of paramount importance to guide medical and regulatory decision making. Its widespread use and immense popularity among teenagers and young adults have caused major concern given potentially significant addictive and detrimental long-term health effects.
Detailed Description:
This exploratory proposal will exploit 3D hyperpolarized xenon-129 MRI (HXeMRI), an imaging tool that our research group has pioneered, to address this urgent need. The HXeMRI technique has unique abilities to quantify regional ventilation (airflow), and gas uptake by tissue (interstitium), and blood (pulmonary vasculature) in the human lung with high spatial resolution. HXeMRI is anticipated to overcome the limitations of PFT and MDCT. Because HXeMRI images are acquired in a single breath-hold, pixel-based ratio maps can quantify xenon movement crossing from airways to tissue and finally to RBCs. The calculated ratios are closely related to important lung physiological factors: Tissue-to-Gas ratio (T/G) reflects tissue integrity and alveolar surface-to-volume ratio; RBC-to-Gas ratio (R/G) reflects overall gas exchange efficiency from the airspaces to the blood, and RBC-to-Tissue ratio (R/T) reflects capillary perfusion and gas-blood barrier functional integrity. The sensitivity and specificity of these parameters have been shown to be highly relevant in clinical arenas. For example, decreases in gas uptake by tissue and blood are consistently found in COPD and interstitial lung disease. Alteration of gas exchange measured by RBC-to-tissue ratio in COPD and asthma is associated with changes in the alveolar septal wall and capillary perfusion. Investigators have found regionally heterogeneous tissue gas uptake and impairment of gas exchange in idiopathic pulmonary fibrosis. This actively-funded NIH study has found highly heterogeneous airway obstruction and alterations of gas exchange in patients with cystic fibrosis that are routinely undetectable by clinical PFT. These results demonstrate the unique advantages of HXeMRI to quantitatively assess comprehensive regional physiology of microscopic pulmonary compartments.
Study Oversight
Has Oversight DMC:
True
Is a FDA Regulated Drug?:
True
Is a FDA Regulated Device?:
False
Is an Unapproved Device?:
None
Is a PPSD?:
None
Is a US Export?:
False
Is an FDA AA801 Violation?: