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Withdrawn before recruitment started.
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Instead of the usual procedure of injecting ICG dye directly into an arm vein, now the dye can be placed inside of RBCs. When a small volume of the RBC's with the dye is injected into a person's arm, the individual RBCs can be seen as they flow through the retinal blood vessels.
Capillary erythrocyte movement throughout the entire human macula can be observed routinely for periods up to 20 minutes by autologous re-injection of a small volume (about 1 mL) of indocyanine green (ICG)-loaded erythrocytes, making possible for the first time quantification of blood flow in individual capillaries, including abnormal structures like choroidal neovascularization (CNV), and it makes possible characterization of vasomotion in ocular vasculatures.
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| Label | Type | Description | Intervention Names |
|---|---|---|---|
| ICG loaded erythrocytes | Experimental | Ability to directly visualize erythrocyte dynamics within the retinal and choroidal microcirculations would facilitate focused investigations into the relationships between vasomotion (i.e., pulsatile erythrocyte movement through capillaries) and oxygen distribution to localized tissue regions. |
|
| Name | Type | Description | Arm Group Labels | Other Names |
|---|---|---|---|---|
| ICG loaded erythrocytes | Procedure | For each subject, on the morning of the day angiography was scheduled, or no longer than 4 days prior to angiography, 9 ml of blood will be withdrawn from an antecubital vein. Using sterile procedures, erythrocyte ghosts produced from the blood will be loaded with ICG dye (for the diagnostic part of the study) or with ICG and one of several drugs (for the therapeutic part of the study) by the following procedure, which requires about 2 hours and yields approximately 1 ml of packed cells (80% Ht) that, after microscopic examination, are ready for autologous re-injection |
| Measure | Description | Time Frame |
|---|---|---|
| Capillary erythrocyte movement | To demonstrate in each subject eye the differences between erythrocyte movement through retinal and choroidal capillaries in normal fundus areas and their movement through abnormal areas associated with vascular disease | 1 hour |
| Measure | Description | Time Frame |
|---|---|---|
| Retinal capillary movement | To demonstrate the relationship between the state of retinal vasomotion and retinal edema in the human eye. The primary focus will be on eyes with CNV associated with age-related macular degeneration (AMD) and eyes with diabetic retinopathy (DR). | 1 hour |
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Inclusion Criteria:
Exclusion Criteria:
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| Name | Affiliation | Role |
|---|---|---|
| Lawrence A Yannuzzi, MD | NSLIJ/MEETH | Principal Investigator |
| Facility | Status | City | State | ZIP | Country | Contacts |
|---|---|---|---|---|---|---|
| Northshore LIJ/MEETH Campus | New York | New York | 10065 | United States |
| PubMed Identifier | Type | Citation | Retractions |
|---|---|---|---|
| 10764860 | Background | Flower RW. Experimental studies of indocyanine green dye-enhanced photocoagulation of choroidal neovascularization feeder vessels. Am J Ophthalmol. 2000 Apr;129(4):501-12. doi: 10.1016/s0002-9394(99)00411-0. |
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| ID | Term |
|---|---|
| D012164 | Retinal Diseases |
| ID | Term |
|---|---|
| D005128 | Eye Diseases |
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