Optic nerve axonal pathology is related to abnormal visual evoked responses in AIDS.
Electrophysiological studies in subjects with HIV/AIDS demonstrate subtle changes in the visual pathway even in the absence of visual symptoms. But the pathological correlate of the electrophysiological abnormalities is largely unknown. This study attempts to correlate pathological changes in the retina and intraorbital portion of optic nerve in four drug naïve patients of AIDS caused by HIV-1 clade C, who had abnormalities in the visual evoked potentials recorded antemortem. Three had no visual complaints and one patient had sudden loss of vision in the right eye. In all four patients, the visual evoked potentials disclosed variable prolongation of P100 latencies. Histologically axonal cytoskeletal breakdown and depletion in the optic nerves was the cardinal finding with variable myelin loss, even in the absence of overt visual dysfunction, or infective retinitis. The axonal loss was maximal in the symptomatic case. Retinal ganglion cell depletion was seen in only two patients. Sectoral infiltration of the optic nerve by cryptococci and Cryptococcal choroiditis was the only opportunistic infection to involve the eye. Axonal pathology in the optic nerve appears to be related to the abnormalities recorded in visual evoked potentials even in the absence of overt clinical symptoms. Opportunistic infections could be contributing to the axonal pathology in the optic nerve in patients with AIDS.
Mahadevan
Anita
A
Department of Neuropathology, National Institute of Mental Health and Neurosciences, Bangalore 560029, India.
Satishchandra
Parthasarathy
P
Prachet
Krishnamurthy Kulkarni
KK
Sidappa
Nagadenahalli Byrareddy
NB
Ranga
Udaykumar
U
Santosh
Vani
V
Yasha
Thagadur Chickabasavaiah
TC
Desai
Anita
A
Ravi
Vasanthapuram
V
Shankar
Susarla Krishna
SK
D000163:Acquired Immunodeficiency Syndrome / Q000473:pathology* / Q000503:physiopathology*; D000328:Adult; D015703:Antigens, CD / Q000378:metabolism; D015214:Antigens, Differentiation, Myelomonocytic / Q000378:metabolism; D004558:Electric Stimulation / Q000379:methods; D005074:Evoked Potentials, Visual / Q000502:physiology* / Q000528:radiation effects; D005260:Female; D006801:Humans; D007150:Immunohistochemistry / Q000379:methods; D008297:Male; D016900:Neurofilament Proteins / Q000378:metabolism; D009900:Optic Nerve / Q000473:pathology* / Q000503:physiopathology*; D011930:Reaction Time / Q000502:physiology / Q000528:radiation effects; D000097382:CD68 Molecule
D015703:Antigens, CD; D015214:Antigens, Differentiation, Myelomonocytic; D016900:Neurofilament Proteins; C067980:CD68 antigen, human; D000097382:CD68 Molecule