High-speed ultrahigh resolution optical coherence tomography before and after ranibizumab for age-related macular degeneration.
OBJECTIVE
To evaluate intraretinal anatomy in patients with exudative age-related macular degeneration (AMD) using high-speed ultrahigh resolution optical coherence tomography (hsUHR-OCT) before and 1 month after intravitreal injection of ranibizumab.


METHODS
Retrospective case series.


METHODS
Twelve eyes of 12 patients.


METHODS
A broad bandwidth superluminescent diode laser light source and spectral/Fourier domain signal detection were used to create a prototype hsUHR-OCT instrument with 3.5 mum axial image resolution and approximately 25,000 lines/second acquisition speed. Twelve eyes of 12 patients with exudative AMD were imaged with hsUHR-OCT before and 1 month after intravitreal ranibizumab injection. High pixel density and raster-scanned 3-dimensional (3D) OCT data sets were generated. Three-dimensional imaging software was used to calculate subretinal/retinal pigment epithelium fluid volume and volume of the fibrovascular lesion.


METHODS
Qualitative and quantitative analysis of hsUHR-OCT images and 3D data sets.


RESULTS
All eyes had some degree of normalization of macular contour after intravitreal ranibizumab. The inner/outer photoreceptor segment junction visualized on hsUHR-OCT was discontinuous, overlying the fibrovascular lesion in all 12 of 12 eyes both before and after treatment; 9 of 12 eyes had focal areas of thinning of the outer nuclear layer, which remained after treatment. Volumetric measurements were possible in 8 of 12 eyes with 3D-rendering software. Fibrovascular lesion volume did not change significantly after treatment.


CONCLUSIONS
hsUHR-OCT is capable of unprecedented imaging speed and resolution, making it a valuable instrument in measuring in vivo intraretinal pathology. All 12 eyes had some normalization of macular contour. Fibrovascular lesion volume did not change significantly 1 month after treatment, suggesting that ranibizumab does not cause much initial regression of preexisting neovascular tissue. Photoreceptor abnormalities remained in all patients after treatment of wet AMD, suggesting that although ranibizumab improves overall retinal architecture, some photoreceptor damage may be irreversible.


BACKGROUND
Proprietary or commercial disclosure may be found after the references.
Witkin
Andre J
AJ
Tufts Medical Center, Tufts University, 800 Washington Street, Boston, MA 02111,USA. AJWitkin@Gmail.com
Vuong
Laurel N
LN
Srinivasan
Vivek J
VJ
Gorczynska
Iwona
I
Reichel
Elias
E
Baumal
Caroline R
CR
Rogers
Adam H
AH
Schuman
Joel S
JS
Fujimoto
James G
JG
Duker
Jay S
JS
D000368:Aged; D000369:Aged, 80 and over; D020533:Angiogenesis Inhibitors / Q000627:therapeutic use*; D000911:Antibodies, Monoclonal / Q000627:therapeutic use*; D061067:Antibodies, Monoclonal, Humanized; D005260:Female; D005451:Fluorescein Angiography; D006801:Humans; D007091:Image Processing, Computer-Assisted; D021621:Imaging, Three-Dimensional / Q000379:methods; D007267:Injections; D008268:Macular Degeneration / Q000175:diagnosis* / Q000188:drug therapy*; D008297:Male; D008875:Middle Aged; D000069579:Ranibizumab; D012160:Retina / Q000473:pathology*; D012189:Retrospective Studies; D041623:Tomography, Optical Coherence; D014792:Visual Acuity; D014822:Vitreous Body
D020533:Angiogenesis Inhibitors; D000911:Antibodies, Monoclonal; D061067:Antibodies, Monoclonal, Humanized; D000069579:Ranibizumab