Diagnostic Yield of Vitreous Biopsy in Sarcoid Uveitis
|First Received Date ICMJE||January 25, 2008|
|Last Updated Date||April 9, 2013|
|Start Date ICMJE||January 2007|
|Primary Completion Date||October 2007 (final data collection date for primary outcome measure)|
|Current Primary Outcome Measures ICMJE
||To determine the diagnostic yield of vitreous biopsy in patients with suspected sarcoid uveitis [ Time Frame: January 1989 to June 2006 ] [ Designated as safety issue: No ]|
|Original Primary Outcome Measures ICMJE||Same as current|
|Change History||Complete list of historical versions of study NCT00609687 on ClinicalTrials.gov Archive Site|
|Current Secondary Outcome Measures ICMJE||Not Provided|
|Original Secondary Outcome Measures ICMJE||Not Provided|
|Current Other Outcome Measures ICMJE||Not Provided|
|Original Other Outcome Measures ICMJE||Not Provided|
|Brief Title ICMJE||Diagnostic Yield of Vitreous Biopsy in Sarcoid Uveitis|
|Official Title ICMJE||Diagnostic Yield of Vitreous Biopsy in Sarcoid Uveitis|
The usefulness of diagnostic vitrectomy in patients with suspected sarcoidosis with posterior segment involvement (in whom a diagnosis cannot be determined by conventional methods) has not been well described. We hypothesized that diagnostic vitrectomy would help establish the diagnosis in these challenging cases. Herein, we evaluated the diagnostic yield of vitreous biopsy in patients with suspected sarcoidosis-associated uveitis that affected the posterior segment.This is a retrospective interventional case series. Cases of intermediate, posterior or panuveitis that could not be characterized by clinical examination, ancillary, and laboratory tests were considered for diagnostic pars plana vitrectomy. Retrospective chart review was conducted on consecutive eyes that underwent diagnostic, or diagnostic and therapeutic vitrectomy by a single surgeon from January 1989 to June 2006.
We obtained approval to conduct this non-comparative, interventional, retrospective case series from the Duke University Institutional Review Board. We used an established database of patients with uveitis and the operative reports from a single surgeon (GJJ) to identify all consecutive patients who underwent diagnostic pars plana vitrectomy from January 1989 to June 2006. We excluded patients with acute postoperative or traumatic endophthalmitis from this study. Cases were included if intraocular vitreous specimens were obtained for diagnostic testing. After identifying 150 patients, we reviewed the medical records of these individuals as previously described.
Patient demographic data and clinical history were recorded at the time of initial visit. A complete ophthalmic history and examination were performed by a single examiner (GJJ). The examination included slit-lamp biomicroscopy and dilated fundus examination with indirect ophthalmoscopy. Anterior segment inflammation was graded using the system described by Hogan and colleagues. The system previously described by Nussenblatt et.al. was used to grade vitreous opacity. Fluorescein angiography, optical coherence tomography, and ultrasonography were performed as indicated. A differential diagnosis was compiled for each case, based on clinic findings. Additional laboratory tests were ordered depending on the constellation of clinical history, exam findings, and results of previous ancillary testing. Anti-inflammatory therapy was initiated in an empiric or diagnosis-specific manner, and the clinical response was followed carefully.
Diagnostic vitrectomy was performed on eyes with intermediate, posterior, or panuveitis in which an etiology could not be characterized by clinical examination, laboratory, and/or ancillary testing. In addition, diagnostic vitrectomy was performed on eyes that did not adequately respond to empirical therapy, or those in which intraocular malignancy or infection was suspected. Therapeutic vitrectomy was performed in conjunction with diagnostic vitrectomy when clinically indicated, for example to repair retinal detachment, to remove epiretinal membranes, to decrease vitreous opacity, or to insert an intraocular sustained drug-delivery implant.
In this study, vitreous samples were collected in the operating room using a standardized technique which has been previously reported. Briefly, three-port, 20-gauge pars plana vitrectomy instrumentation was utilized. An infusion line was inserted into one sclerotomy and secured to the globe. A second sclerotomy was made, and a fiberoptic light pipe was immediately inserted to minimize vitreous egress. A third sclerotomy was created, and the vitreous cutter was inserted. To obtain an undiluted vitreous sample, the vitreous was cut mechanically with the vitreous cutter, while the assistant surgeon simultaneously manually aspirated the vitreous. The tip of the vitreous cutter was viewed at all times with the wide-field viewing system during the procedure. After sufficient undiluted sample was obtained, infusion fluid was allowed to enter the eye and a diluted vitreous sample was obtained in a similar manner. The samples were personally carried to the clinical laboratories by the operating surgeon. Vitreous fluid analysis was guided by clinical suspicion based on the pre-operative differential diagnosis and the intraoperative posterior segment appearance. Cytopathology was used to identify granulomatous inflammation or tumor cells. A thin-prep was prepared, processed through a membrane filter apparatus (Millipore Corp, Bedford, MA) and then stained with Papanicolaou stain. Gram stain, KOH preparation and culture were used to diagnose intraocular infection. Where appropriate, instructions were given to the clinical laboratory for specific sample processing (e.g., suspected slow-growing bacterium, such as Propionibacterium acnes or suspected fungal infection). Genomic amplification by polymerase chain reaction (PCR) was performed at the University of Colorado (Boulder, CO), or Texas Children's Hospital (Houston, TX) to test for the presence of Herpes simplex virus, Herpes zoster virus, and cytomegalovirus. PCR was performed for Toxoplasma gondii at the Palo Alto Medical Foundation (Palo Alto, CA) as previously described. Toxocara canis antibody levels were detected by enzyme-linked immunosorbent assay (ELISA) at the Centers for Disease Control and Prevention (Atlanta, GA). For Toxoplasma gondii and Toxocara canis, simultaneous serum samples were also collected and sent to the respective laboratories.
The final diagnosis was based upon the results of the directed diagnostic testing of the vitreous sample. A positive diagnostic vitrectomy result was based upon the identification of a specific etiologic agent through the testing modalities previously described. Sarcoidosis is a diagnosis of exclusion without a known etiologic agent. There are no definitive laboratory tests that unequivocally confirm a diagnosis of sarcoid. Therefore, a diagnostic specimen was deemed positive for sarcoid-related inflammation if the following criteria were satisfied: 1) if all other vitreous testing was negative 2) if the clinical features were such that sarcoidosis was included in the differential diagnosis based on pre-operative clinical appearance, and 3) if the cytopathology specimen was consistent with a pattern of sarcoid-related inflammation such as non-caseating granuloma formation, as established by the cytopathologist.
|Study Type ICMJE||Interventional|
|Study Phase||Not Provided|
|Study Design ICMJE||Intervention Model: Single Group Assignment
Masking: Open Label
Primary Purpose: Diagnostic
|Condition ICMJE||Sarcoidosis-associated Ocular Inflammation|
|Intervention ICMJE||Procedure: Diagnostic Vitrectomy
Three-port, 20-gauge pars plana vitrectomy instrumentation was utilized. An infusion line was inserted into one sclerotomy and secured to the globe. A second sclerotomy was made, and a fiberoptic light pipe was immediately inserted to minimize vitreous egress. A third sclerotomy was created, and the vitreous cutter was inserted. To obtain an undiluted vitreous sample, the vitreous was cut mechanically with the vitreous cutter, while the assistant surgeon simultaneously manually aspirated the vitreous. After sufficient undiluted sample was obtained, infusion fluid was allowed to enter the eye and a diluted vitreous sample was obtained in a similar manner. The samples were personally carried to the clinical laboratories by the operating surgeon.
Vitreous fluid analysis was guided by clinical suspicion based on the pre-operative differential diagnosis and the intraoperative posterior segment appearance.
|Study Arm (s)||A
Patients with suspected sarcoid-related posterior segment inflammation with inconclusive clinical exam findings, ancillary testing, and laboratory results
Intervention: Procedure: Diagnostic Vitrectomy
* Includes publications given by the data provider as well as publications identified by ClinicalTrials.gov Identifier (NCT Number) in Medline.
|Recruitment Status ICMJE||Completed|
|Completion Date||January 2008|
|Primary Completion Date||October 2007 (final data collection date for primary outcome measure)|
|Eligibility Criteria ICMJE||
|Accepts Healthy Volunteers||No|
|Contacts ICMJE||Contact information is only displayed when the study is recruiting subjects|
|Location Countries ICMJE||United States|
|NCT Number ICMJE||NCT00609687|
|Other Study ID Numbers ICMJE||Pro00014310|
|Has Data Monitoring Committee||Yes|
|Responsible Party||Duke University|
|Study Sponsor ICMJE||Duke University|
|Collaborators ICMJE||Not Provided|
|Information Provided By||Duke University|
|Verification Date||January 2008|
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