Acta Neuropathologica

, Volume 112, Issue 4, pp 461–469 | Cite as

Optic nerve axonal pathology is related to abnormal visual evoked responses in AIDS

  • Anita Mahadevan
  • Parthasarathy Satishchandra
  • Krishnamurthy Kulkarni Prachet
  • Nagadenahalli Byrareddy Sidappa
  • Udaykumar Ranga
  • Vani Santosh
  • Thagadur Chickabasavaiah Yasha
  • Anita Desai
  • Vasanthapuram Ravi
  • Susarla Krishna Shankar
Original Paper

Abstract

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.

Keywords

Visual evoked potentials Optic nerve Axonal loss Demyelination Opportunistic infections Cryptococcal optic neuritis 

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Copyright information

© Springer-Verlag 2006

Authors and Affiliations

  • Anita Mahadevan
    • 1
  • Parthasarathy Satishchandra
    • 2
  • Krishnamurthy Kulkarni Prachet
    • 2
  • Nagadenahalli Byrareddy Sidappa
    • 4
  • Udaykumar Ranga
    • 4
  • Vani Santosh
    • 1
  • Thagadur Chickabasavaiah Yasha
    • 1
  • Anita Desai
    • 3
  • Vasanthapuram Ravi
    • 3
  • Susarla Krishna Shankar
    • 1
  1. 1.Department of NeuropathologyNational Institute of Mental Health and NeurosciencesBangaloreIndia
  2. 2.Department of NeurologyNational Institute of Mental Health and NeurosciencesBangaloreIndia
  3. 3.Department of NeurovirologyNational Institute of Mental Health and NeurosciencesBangaloreIndia
  4. 4.Molecular Biology and Genetics UnitJawaharlal Nehru Centre for Advanced Scientific ResearchJakkur, BangaloreIndia

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