Alveoscopy, Endoscopic Confocal Microscopy and Lung Rejection, Parenchymal Lung Diseases in Vivo

The safety and scientific validity of this study is the responsibility of the study sponsor and investigators. Listing a study does not mean it has been evaluated by the U.S. Federal Government. Read our disclaimer for details. Identifier: NCT01033201
Recruitment Status : Completed
First Posted : December 16, 2009
Last Update Posted : January 26, 2012
Information provided by:
Mayo Clinic

Brief Summary:

Lung transplantation is indicated when end-stage lung diseases no longer respond to available standard therapy, making life expectancy short and associated with disability. Acute and chronic rejection are common complications following transplantation, indicating screening bronchoscopies and transbronchial biopsies at three month intervals the first two years, in addition to clinically indicated procedures when rejection or infection is suspected. Transbronchial biopsies carry associated risks (bleeding, pneumothorax). Chronic rejection is characterized by progressive obliteration of distal airways (Bronchiolitis Obliterans-BO-). BO requires open lung biopsy for diagnosis. Alternatively, a clinical surrogate (Bronchiolitis Obliterans Syndrome), characterized by decline in Forced Expired Volume in 1 second not explained by acute rejection or infection is used for diagnosis. The new technique of confocal endo-microscopy enables sub-surface visualization of tissue in vivo during bronchoscopic procedures using a probe-based confocal microscope, integrated to a standard endoscope. Bronchiolar and alveolar structures can be visualized at a cellular and nuclear level, and these images can be saved and reviewed. This new technology could potentially identify acute and chronic rejection, thus offering and alternative to transbronchial biopsies. We expect to describe a new alternative to diagnose acute and chronic rejection using confocal microscopy images obtained endoscopically, obviating complications of transbronchial biopsies.

Endoscopic confocal endomicroscopy can detect and classify common bronchiolar and alveolar pathological conditions in real time. Specifically, we hypothesize that confocal endomicroscopy images of bronchiolar and alveolar structures during standard bronchoscopy could help to recognize and classify the presence/absence of acute rejection and/or bronchiolitis obliterans syndrome in lung transplant recipients. This technology could also identify the histological characteristics lung diseases such as interstitial, obstructive or vascular end stage lung diseases, and thus lead to more efficient, safer and more accurate diagnosis of these lung conditions during routine bronchoscopies.

Condition or disease Intervention/treatment
Lung Transplant Other: Confocal imaging

Study Type : Observational
Actual Enrollment : 71 participants
Observational Model: Case-Only
Time Perspective: Prospective
Official Title: The Role Of Endoscopic Alveoscopy by Confocal Endomicroscopy in Diagnosing Acute and Chronic Rejection in Lung Transplant Recipients, Diagnosis of End Stage Lung Disease, and Other Pulmonary Pathologies in Vivo
Study Start Date : April 2008
Actual Primary Completion Date : March 2011
Actual Study Completion Date : March 2011

Resource links provided by the National Library of Medicine

Group/Cohort Intervention/treatment
Lung transplant
All lung transplant patients presenting for screening/surveillance and diagnostic bronchoscopies at Mayo Clinic Florida are eligible for participation.
Other: Confocal imaging
At the time of the standard of care bronchoscopy, confocal images will be obtained from each consented patient.
Other Names:
  • AlveoloFlex Confocal Miniprobes
  • Cellvizio-Lung system

Primary Outcome Measures :
  1. To determine in an unblinded study, the key image features of acute lung rejection and chronic lung rejection (BOS), and estimate which morphologic features best distinguish these conditions. [ Time Frame: One year ]

Secondary Outcome Measures :
  1. To determine the initial sensitivity and specificity of confocal imaging for the classification of acute lung rejection among lung transplant recipients. [ Time Frame: One year ]
  2. To develop a library of confocal images with the most optimal confocal imaging characteristics of other lung pathologies requiring lung transplantation. [ Time Frame: One year ]
  3. To determine the inter-examiner differences and learning curve for accurate detection of acute rejection as well as the confocal images of other lung pathologies. [ Time Frame: One year ]
  4. To determine in a unblinded pilot study, the key image features of chronic lung rejection as defined by the Bronchiolitis Obliterans Syndrome (BOS), and estimate which morphologic features best distinguish this conditions. [ Time Frame: One year ]

Information from the National Library of Medicine

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Ages Eligible for Study:   18 Years to 80 Years   (Adult, Older Adult)
Sexes Eligible for Study:   All
Accepts Healthy Volunteers:   No
Sampling Method:   Probability Sample
Study Population
Patients scheduled to undergo bronchoscopy either before or after lung transplantation.

Inclusion Criteria:

  1. Age above 18 years
  2. Any patient undergoing surveillance or clinically indicated bronchoscopies during or after lung transplantation
  3. Any patient undergoing bronchoscopy prior lung transplant

Exclusion Criteria:

  1. Unwilling to consent
  2. Unable to safely tolerate a bronchoscopic procedure

Information from the National Library of Medicine

To learn more about this study, you or your doctor may contact the study research staff using the contact information provided by the sponsor.

Please refer to this study by its identifier (NCT number): NCT01033201

United States, Florida
Mayo Clinic Florida
Jacksonville, Florida, United States, 32224
Sponsors and Collaborators
Mayo Clinic


Responsible Party: Cesar A. Keller, M.D., Mayo Clinic Florida Identifier: NCT01033201     History of Changes
Other Study ID Numbers: 08-000800
First Posted: December 16, 2009    Key Record Dates
Last Update Posted: January 26, 2012
Last Verified: January 2012

Keywords provided by Mayo Clinic:
Lung rejection

Additional relevant MeSH terms:
Lung Diseases
Respiratory Tract Diseases