Ayub K. Ommaya

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Ayub Khan Ommaya
Ayub ommaya.JPEG
Born April 14, 1930
Mian Chanu Punjab, Pakistan.
Died July 11, 2008(2008-07-11) (aged 78)[1][2]
Islamabad Pakistan
Occupation Neurosurgeon
Known for Innovative Surgeon, Ommaya reservoir
Relatives Brig. Jan Nadir Khan (brother), Jacob Khan Ommaya (brother), and Nadin Hayat (sister)

Ayub Khan Ommaya, MD, ScD (h.c.), FRCS, FACS (April 14, 1930, Mian Channu - July 11, 2008, Islamabad) was a neurosurgeon and the inventor of the Ommaya reservoir. The reservoir is used to provide chemotherapy directly to the tumor site for brain tumors. Ommaya was also a leading expert in traumatic brain injuries.

Summary[edit]

Dr. Ommaya published over 150 articles, chapters, and books. His research focused on cancer treatment, traumatic brain injury, a CSF artificial organ, and philosophy of mind. Through discussions with Cong. William Lehman Chair of the House Appropriations Committee responsible for the Department of Transportation, he developed CDC's National Center for Injury Prevention and Control, which as part of its mission focuses on traumatic brain injury. As part of this effort Ommaya commissioned the IOM report Injury in America. The report called for the creation of the CDC center.

Dr. Ommaya’s research provided the experimental data needed to model traumatic brain injury. His Centripetal theory was foundational to the biomechanics of traumatic brain injury. This work allowed for improved modeling of brain injury by engineers in their design of safety equipment in automobiles.

Dr. Ommaya also did early work with the Computed Tomography Scanner. His work with Sir Godfrey Hounsfield to determine the spatial resolution of the CT scanner opened the door for its use in stereotactic surgery. Spinal angiography was also pioneered by Ommaya, Di Chiro, and Doppman. This work allowed for the visualization of arteries and veins and allowed for understanding of spinal cord arteriography. The same team reported the treatment of spinal cord AVMs by percutaneous embolization of an intercostal artery using stainless steel pellets. This was one of the first reports of interventional neuroradiology. Dr. Ommaya made several significant contributions to many areas that concern Neurological surgeons, treatment of cancer, hydrocephalus, traumatic brain injury, and Arterio-Venous Malformations.

Professional history[edit]

Dr. Ommaya received his M.D. from King Edward Medical College in Pakistan in 1953 [3] and completed his graduate work in Physiology, Psychology, and Biochemistry at the University of Oxford (Balliol College) as a Rhodes Scholar (M.A.) in 1956.[4] Dr.Ommaya won a national swimming competition in 1953 and also established himself as a champion debator and trained as an operatic singer. In 1960, Dr. Ommaya immigrated to the United States. He became a US citizen in 1962. Dr. Ommaya received his honorary Doctor of Science degree from Tulane University, School of Engineering Sciences in 1981.[5]

From 1960 to 1980, he joined the staff of the National Institute of Health and became Chief of Neurosurgery,[6][7] studying treatment of malignant neoplasms, the biomechanics and mechanisms of brain injury, and memory. He has also served as Chief Medical Advisor to the U.S. Department of Transportation (National Highway Traffic Safety Administration) from 1980 until 1985. He was a clinical professor at George Washington University from 1980 until 2003.[8]

He had patents in devices for drug delivery to the brain, protective systems for neck and head injuries and an artificial organ for treatment of diabetes.[9]

He was Hunterian Professor of the Royal College of Surgeons of England.[10]

Neurosurgical career[edit]

Dr. Ommaya completed his neurosurgical training under Dr. Joseph Pennybacker at Nuffield College of Surgical Sciences in London and at the Radcliffe Infirmary in Oxford. After his neurosurgical training, Dr. Ommaya came to America and began working as a researcher and clinician at the Surgical Neurology Branch of the NIH. He rose to the rank of chief of Neurosurgery at the National Institute of Neurological Disorders and Stroke, National Institute of Health. He also was a clinical professor at George Washington University.[11]

Dr. Ommaya was well known for his surgical skill and in 1977 he completed a difficult removal of a spinal Arterio-Venous Malformation (AVM) which received attention in the lay press.[12] During the 18 hour operation the patient was placed in total body hypothermia and total circulatory arrest for 45 minutes. The hypothermia was needed to slow metabolism and protect the brain and organs from reduced oxygen supply while Dr. Ommaya surgically embolized and removed an AVM which was located near the medulla. Dr. Ommaya was the honorary physician to the President of Pakistan and he received Pakistan’s highest civilian award the Star of Achievement. Dr. Ommaya also appeared with Peter Ustinov, Nick Nolte, and Susan Sarandon in the movie Lorenzo's Oil released in 1992.[13]

Many firsts[edit]

Dr. Ommaya's invention, the Ommaya reservoir, was the first subcutaneous reservoir that allowed for repeated intrathecal injections.[14][15] Before his invention patients had to suffer repeated lumbar punctures for intrathecal drug administration. Spinal angiography was pioneered by Ommaya, Di Chiro, and Doppman.[16] This work allowed for the visualization of arteries and veins and allowed for understanding of spinal cord arteriography. The same team reported the treatment of spinal cord AVMs by percutaneous embolization of an intercostal artery using stainless steel pellets. This was one of the first reports of interventional neuroradiology.[17]

Ommaya Reservoir

Dr. Ommaya's models and work in traumatic injury were foundational to the biomechanics of traumatic brain injury.[18][19][20][21][22][23][24] This work allowed for improved modeling of brain injury by engineers in their design of safety equipment in automobiles. Dr. Ommaya also published the first coma score for classification of traumatic brain injury. The most widely used contemporary classification systems follow the Ommaya approach.[25] Dr. Ommaya's friendship with Congressman Lehman, then chair of the House Appropriations Subcommittee on Transportation, lead to the creation of the National Center for Injury Prevention and Control.[26]

Dr. Ommaya worked with Sir Godfrey Hounsfield to determine the spatial resolution of the CT scanner which opened the door for its use in stereotactic surgery.[27][28] Dr. Ommaya also invented the first spinal fluid driven artificial organ.[29]

Interventional neuroradiology[edit]

The work of Di Chiro, Doppman, and Ommaya, and was critical to the development of spinal angiography.[16][30] The visualization of arteries and veins allowed for understanding of the pathophysiology of spinal AVMs in addition to classification of lesions. Di Chiro, Ommaya, and Doppman also reported one of the earliest interventional radiology approaches using stainless steel pellets to treat a spinal cord AVM.[31] This percutaneous embolization approach was noted as less traumatic than surgical treatment by the authors and represented another step forward in pecutaneous vascular embolization as an addition the surgical armamentarium for treating certain vascular disorders of the central nervous system.

CSF rhinorrhea[edit]

Before Ommaya’s work, CSF rhinorrhea was classified as either traumatic or spontaneous. The second category was essentially a catchall category which did not assist in guiding treatment approaches.[32] Ommaya classified non traumatic rhinorrhea as resulting from either high pressure leaks (tumors & hydrocephalus) or "normal" leaks (congenital abnormalities, focal atrophy, oysteomyelitis). Nontraumatic rhinorrhea is a challenge in diagnosis and choice of surgical approach. Of importance to successful surgical outcome is the demonstration of fistula. Within the non traumatic category, CSF rhinorrhea occurring with primary empty sella (PES) was first reported by Ommaya.[33]

Biomechanics of traumatic brain injury[edit]

Ommaya’s cetripedal theory identified that the effects always begin at the surface of the brain in mild injury and extend inward to affect the diencephalic- mesencephalic core in more severe injury.[18] His work showed that both translational and rotational acceleration produce focal lesions but that only rotational acceleration produced diffuse axonal injury. When damage is found in the rostral brainstem it is also associated with diffuse hemispheric damage. Prior to his work it was believed that the mechanism of consciousness was linked to primary brainstem injury. However, the brainstem and mesencephalon are the last structure to be affected in severe injury, and rotational rather than translational forces produce concussion. Contact phenomenon contribute to the development of focal lesions, e.g. frontal and temporal lesions due to contact with the sphenoid bone.[34] Magnetic resonance imaging (MRI) studies have supported these theories.[25][35] They have confirmed that the distribution of lesions follows a centripetal pattern that follows injury severity identified by the Glascow Coma Score.

Ommaya reservoir[edit]

Dr. Ayub Ommaya first reported the Ommaya reservoir in 1963. The reservoir is subcutaneous implant for repeated intrathecal injections, to treat hydrocephalus and malignant tumors.[14] The reservoir was the first medical port to use silicone which is biologically inert and self-sealing. The Ommaya reservoir allows delivery of intermittent bolus injections for chemotherapy to the tumor bed. Agents are injected percutaneously into the reservoir and delivered to the tumor by compression of the reservoir. The Ommaya reservoir provided a great improvement for treatment which reduces the risk of infection.

Creation of the National Center for Injury Prevention and Control[edit]

While the Chief Medical Advisor for the Department of Transportation in the 1980s, Dr. Ommaya commissioned a report, Injury in America, from the Institute of Medicine (IOM) in 1985.[36] This report and efforts by Congressman William Lehman and Dr. Ommaya lead to the creation of the Center for Disease Control's, National Center for Injury Prevention and Control which began to provide synthesis, direction, and funding for the field. Congressman William Lehman and Dr. Ommaya became friends when he cared for his daughter. They had many discussions focusing on the need for a center that emphasized injury prevention and research. Congressman Lehman, then chair of the House Appropriations Subcommittee on Transportation, was responsible for the initial $10 million awarded to the CDC to establish a new Center for Injury Control.[37] The FY 2008 budget for the center is $134 Million, and it funds basic and applied injury research. Ayub served on the National Advisory Committee for the Center for 15 years.

Spinal fluid driven artificial organ[edit]

Dr. Ommaya has two children who suffer from Type 1 diabetes. Motivated by his personal experience with the disease, Dr. Ommaya focused on the problem of transplantation of islet cells for the treatment of diabetes. A major challenge facing survival of islet cells is immune rejection. Dr. Ommaya thought that the CSF would provided an ideal setting for transplanted islets due to the immune protection provided by the blood brain barrier. He developed an artificial organ which would house transplanted islets, and the cells could be nourished by the CSF. Ayub, Illani Atwater, and colleagues identified that ventricular-peritoneal CSF shunts provided an immune protected site for the transplantation of mouse and rat islets in dogs and llamas.[38][39] Ayub and colleagues also identified that CSF glucose mirrors blood glucose. Islets cells were able to survive in this system and function in the llama model, but further work on the model is needed.[40] Unfortunately Dr. Ommaya was not able to complete this research.

The role of emotions in consciousness[edit]

Dr. Ommaya focused much of his career on the study of consciousness, the brain, and mind. This interest derived from his reading of Pennfield’s work on surgical treatment of epilepsy. His work in traumatic brain injury was influenced by his interest in how consciousness is altered and how it recovers after traumatic injury. Key to his observations is the role of the limbic system and emotion as foundational for consciousness.[41] In his view, emotion is the trigger to action and other aspects of rationality are tools to justify action. Dr. Ommaya saw consciousness as an emergent property of the evolution of neural structures. Consciousness is the result of evolutionary forces directed to improving the efficiency of mental function. The reintegration of thought and action after traumatic injury provided the experimental context for Dr. Ommaya's thoughts.

It is popularly assumed that emotion disrupts cognition. However, neurophysiology and Dr. Ommaya's TBI research emphasizes its fundamental inseparability. Dr. Ommaya defined four steps in the evolution of consciousness. 1) reflex and avoidance reactions; 2) sensory inputs merged with multisensory neurons in the mesencephalon; 3) interactions formed between sensory and limbic systems and memory; and 4) reinforcement of thalamic neural centers which relays information between sensory and motor centers. Dr. Ommaya discussed how the limbic system and emotion motivates action and focuses attention.

Family[edit]

Dr. Ommaya has six children David, Alex, Shana, Aisha, Iman, and Sinan. He is survived by his wife Ghazali.

Death[edit]

On July 13, 2008, Pakistan's Dawn newspaper reported his death, and called him a "trailblazing Pakistani surgeon".[42]

The Washington Post published an article on July 14, 2008 [1]

The Toledo Blade published an article on July 28, 2008 [2]

The Lancet published an article in November 2008 http://www.thelancet.com/journals/lancet/article/PIIS0140-6736(08)61642-6/fulltext.

References[edit]

  1. ^ a b Holley, Joe (July 14, 2008). "Ayub K. Ommaya, 78; Neurosurgeon and Authority on Brain Injuries". The Washington Post. Retrieved April 26, 2010. 
  2. ^ a b [1]
  3. ^ http://www.pakneurosurgeon.com/pages.php?page=89
  4. ^ http://www.rhodeshouse.ox.ac.uk/page/pakistan
  5. ^ http://tulane.edu/alumni/upload/potpourri.pdf
  6. ^ http://nihrecord.od.nih.gov/newsletters/2008/08_22_2008/milestones.htm
  7. ^ http://www.ncbi.nlm.nih.gov/pmc/articles/PMC3026609/
  8. ^ http://www.thelancet.com/journals/lancet/article/PIIS0140-6736(08)61642-6/fulltext.
  9. ^ http://www.google.com/patents/WO1992013501A1?cl=en&dq=ayub+ommaya&hl=en&sa=X&ei=CvQCUsbRKsTuyQHZmoCgCA&sqi=2&pjf=1&ved=0CDQQ6AEwAA
  10. ^ "Philosophical Society of Washington - Lecture Abstract and Biography". 1992-10-02. Retrieved 2008-01-03. 
  11. ^ http://pkjns.com/Previous/Archived/Apr-June-09/Contents/docs/90.pdf
  12. ^ http://www.wolfeprints.net/jan2005.pdf
  13. ^ http://www.imdb.com/title/tt0104756/fullcredits#cast
  14. ^ a b Ommaya AK, Subcutaneus reservoir and pump for sterile access to ventricular cerebrospinal fluid. Lancet.;2:98 3–984; 1963
  15. ^ Dudrick SJ. History of vascular access. J Parenter Enteral Nutr. 30(1 Suppl):S47-56. 2006
  16. ^ a b DiChiro, G. Doppman, J.L. and Ommaya, A.K.: Selective arteriography of arteriovenous aneurysms of the spinal cord. Radiology, 88: 1065-1077, June 1967.
  17. ^ Huckman MS. Giovanni Di Chiro (1926–1997). AJNR Am J Neuroradiol. Jun-Jul;19(6):1007-10; 1998
  18. ^ a b Ommaya, A.K. and Gennarelli, R.A.: Cerebral concussion and traumatic unconsciousness. Brain., 97: 633-654, 1974.
  19. ^ Ommaya, A.K. and Yarnell, P.: Subdural hematoma after whiplash injury. Lancet, 2: 237-239, August, 1969
  20. ^ Ommaya, A.K., Fass, F., and Yarnell, P.: Whiplash injury and brain damage: An experimental study. J.A.M.A., 204: 285-289, April, 1968.
  21. ^ Ommaya, A.K., Hirsch, A.E., and Martinez., J.: The role of “whiplash” in cerebral concussion. Proceedings of the 10th Stapp Car Crash Conference, New York: Society of Automotive Engineers, 197-203, November, 1966.
  22. ^  Ommaya, A.K., Hirsch, A.E., Flamm, E.S., and Mahone, R.M.: Cerebral concussion in the monkey: An experimental model. Science, 153: 211-212; 1966.
  23. ^ Ommaya, A.K., Hirsch, A.E., Harris, E., and Yarnell, P.: Scaling of experimental data in cerebral concussion in sub-human primates to concussive threshold for man. Proceedings of the 11th Stapp Car Crash Conference, New York: Society of Automotive Engineers, 47-52, October, 1967
  24. ^ Ommaya, A.K., Rockoff, S.D., and Baldwin, M.: Experimental concussion: A first report. J. Neurosurg., 21: 249-267;1964.
  25. ^ a b Levin HS, Mendelsohn D, Lilly MA, Yeakley J, Song J, Scheibel RS, Harward H, Fletcher JM, Kufera JA, Davidson KC, Bruce D. Magnetic resonance imaging in relation to functional outcome of pediatric closed head injury: a test of the Ommaya-Gennarelli model. Neurosurgery;40(3):432-40; 1997
  26. ^ Zaldivar R.A. Low key Rep. Lehman savvy on deal-making ex-salesman acts as State’s rainmaker.    Miami Herald. p. 1A ; November 20, 1989.
  27. ^ Ommaya AK, Murray G, Ambrose J, Richardson A, Hounsfield G. Computerized axial tomography: estimation of spatial and density resolution capability. Br J Radiol.;49(583):604-11; 1976
  28. ^ Ommaya, A.K.: Computerized axial tomography of the head: The EMI-Scanner, a new device for direct examination of the brain “in-Vivo.”  Surg. Neurol. 1: 217-222, 1973.
  29. ^ Ommaya AK. Spinal fluid driven artificial organ. United States Patent and Trademark Office. Patent number: 5385582. Jan 31, 1995
  30. ^ Doppman, J.L., DiChiro, G. and Ommaya, A.K.: Selective Arteriography of the Spinal Cord. St. Louis, Missouri: Warren Green Publisher, 1969.
  31. ^ Doppman, J.L., DiChiro, G., and Ommaya, A.K.: Obliteration of spinal cord arteriovenous malformation by percutaneous embolization. Lancet, 1: 477, March, 1968.
  32. ^ Ommaya AK, DiChiro G, Baldwin M, Pennybacker JB. Non-traumatic cerebrospinal fluid rhinorrhoea J. Neurol. Neurosurg. Psychiat.,; 31, 214-225; 1968 http://www.ncbi.nlm.nih.gov/pmc/articles/PMC496347/pdf/jnnpsyc00231-0008.pdf
  33. ^ Syed BA. Nontraumatic (spontaneous) cerebrospinal fluid rhinorrhea from cribriform fistula associated with primary empty sella: report of two cases and literature review. Ann Saudi Med. Jan;20(1):43-6; 2000
  34. ^ Ommaya AK. Trauma to the nervous system. Hunterian Lecture. Ann. Roy. Coll. Surg. Eng., 39, 317-347; 1966 http://www.ncbi.nlm.nih.gov/pmc/articles/PMC2311953/pdf/annrcse00233-0003.pdf
  35. ^ Levin HS, Williams D, Crofford MJ, High WM Jr, Eisenberg HM, Amparo EG, Guinto FC Jr, Kalisky Z, Relationship of depth of brain lesions to consciousness and outcome after closed head injury. J Neurosurg; Dec;69(6):861-6; 1988 http://www.ncbi.nlm.nih.gov/pubmed/3193191
  36. ^ Committee on Trauma Research Injury in America: A Continuing Public Health Problem. National Academy press: Washington, DC 1985 http://www.nap.edu/catalog.php?record_id=609
  37. ^ Bergman AB Ragnar Berfenstam's legacy. Inj Prev. Mar;6(1):4; 2000 http://www.ncbi.nlm.nih.gov/pmc/articles/PMC1730599/pdf/v006p00004.pdf
  38. ^ Ommaya, A.K., Atwater, I., Coonrod, B.A., et. Al. Novel Transplantation Approach: Islet Xenografts in C.S.F. Shunts in Dogs. Transplantation Proceedings, December, 1994.
  39. ^ Ommaya, A.K., Atwater, I.J., Yanez, A., et. Al. Llama Glama: Unique model for evaluation of xenogenic islet transplants in a CSF driven artificial organ. Transplantation Proceedings, 1995.
  40. ^ Atwater I, Yanez A, Cea R, Navia A, Jeffs S, Arraya V, Szpak-Glasman M, Leighton X, Goping G, Bevilacqua JA, Moreno R, Brito J, Arriaza C, Ommaya A. Cerebral spinal fluid shunt is an immunologically privileged site for transplantation of xenogeneic islets. Transplant Proc. Jun;29(4):2111-5. 1997.
  41. ^ Ommaya, Ayub K. Emotion and the Evolution of Neural Complexity. WESScom: The Journal of the Washington Evolutionary Systems Society 3(1):8-17; 1993
  42. ^ 'Trailblazing Pakistani surgeon dies in US Dawn, July 13, 2008

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