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Neurologist (brain, nervous system)
8 years of experience
Video profile
Accepting new patients


Education ?

Medical School Score Rankings
University of Pennsylvania (2003)
Top 25%

Awards & Distinctions ?

American Association of Neuromuscular and Electrodiagnostic Medicine
American Board of Psychiatry and Neurology

Affiliations ?

Dr. Ortega is affiliated with 3 hospitals.

Hospital Affiliations



  • St Joseph's Hospital
    350 W Thomas Rd, Phoenix, AZ 85013
    Top 25%
  • CHANDLER REGIONAL Medical Center
    475 S Dobson Rd, Chandler, AZ 85224
    Top 25%
  • St. Joseph`s Hospital and Medical Center - Phoenix
  • Publications & Research

    Dr. Ortega has contributed to 2 publications.
    Title Focally Injected Adenosine Prevents Seizures in the Rat.
    Date December 2004
    Journal Experimental Neurology

    Prophylactic drug injection directly onto a seizure focus has the potential to improve seizure control with fewer side effects than is produced by systemic therapy. Using a dose-response model, we evaluated the effectiveness of adenosine application for focal seizure prophylaxis in 12 rats. Total spikes and electroencephalographic ictal events were reduced significantly by treatment with adenosine compared to control (P < 0.0001). This study demonstrates effectiveness and feasibility in a model system using intracranial injection of adenosine to prevent epileptiform events.

    Title Helical Growth of Stage-ivb Sporangiophores of Phycomyces Blakesleeanus: the Relationship Between Rotation and Elongation Growth Rates.
    Date June 2003
    Journal Planta

    An understanding of the relationship between the two components of helical growth (rotation rate and elongation rate) is fundamental to understanding the biophysical and molecular mechanism(s) of cell wall extension in algal cells, fungal cells, and plant stems and roots. Helical growth occurs throughout development of the sporangiophores of Phycomyces blakesleeanus. Previous studies within the growth zone of stage-IVb sporangiophores have reported conflicting conclusions. An implicit assumption in the previous studies [E.S. Castle (1937) J Cell Comp Physiol 9:477-489; R. Cohen and M. Delbruck (1958) J Cell Comp Physiol 52:361-388; J.K.E. Ortega et al. (1974) Plant Physiol 53:485-490] was that the relationship between rotation rate and elongation rate was independent of the magnitude of the elongation rate. In the present study, for stage-IVb sporangiophores growing at a steady rate, it is shown that the ratio of rotation rate and elongation rate decreases as the elongation rate increases. Previously proposed biophysical and molecular mechanisms cannot account for the observed behavior. The previously postulated fibril-reorientation mechanism [J.K.E. Ortega and R.I. Gamow (1974) J Theor Biol 47:317-332; J.K.E. Ortega et al. (1974) Plant Physiol 53:485-490] is modified to accommodate this new finding. Other experiments were conducted to determine how the ratio of rotation rate and elongation rate behaves during a pressure response (a transient decrease in elongation rate produced by a large step-up in turgor pressure using the pressure probe). Results of these experiments indicate that this ratio increases during the pressure response.

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