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Poliomyelitis and Post Polio Syndrome

Poliomyelitis and Post Polio Syndrome. Mazloumi MD Qaem,s Hospital. What is Poliomyelitis?. polio= gray matter Myelitis= inflammation of the spinal cord This disease result in the destruction of motor neurons caused by the poliovir us.

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Poliomyelitis and Post Polio Syndrome

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  1. Poliomyelitis and Post Polio Syndrome Mazloumi MD Qaem,s Hospital

  2. What is Poliomyelitis? • polio= gray matter • Myelitis= inflammation of the spinal cord • This disease result in the destruction of motor neurons caused by the poliovirus. • Polio is causes by a virus that attacks the nerve cells of the brain & spinal cord although not all infections result in sever injuries and paralysis.

  3. POLIOMYELITIS • “Picornavirus” • 3 types: Poliovirus 1,2,3 • Ingested, spread by faeco-oral route: Commoner in areas of poor sanitation • Infants protected by maternal antibodies

  4. History • Associated with man since ancient times • Egyptian hieroglyph indicates presence since 1400 BC • 1840 - Heinle characterizes poliomyelitis • Poliomyelitis – “grey marrow” in Greek • 1954 - Salk vaccine • 1960 - Sabin vaccine • 1991 – Molla produces polio in vitro from virus RNA • 2002 – completele synthetic production

  5. Polio Eradication:Status in 1988

  6. Polio Eradication: Status in 1998

  7. “Silent circulation” Many hundreds may be infected prior to the development of a single case of paralysis WHO considers a single confirmed case of polio in an area of low occurrence an epidemic Epidemiology

  8. How is polio transmitted? • Poliovirus is transmitted through both oral and fical routes with implantation and replication occurring in either the orapgaryngeal and or in the intestine of mucosa. Polio cases are most infected for 7-10 days before and after clinical symptoms begin.

  9. The unique stages of infection and pathogenesis of poliomyelitis. Poliovirus, an “Enterovirus” has an icosahedral capsid shell that protects it from digestion. GI Tract  Blood  Cord  CNSParalysis of motor neurons

  10. Provocative Poliomyelitis • Provocative poliomyelitis occurs when a person having polio virus circulating in blood (viraemia) receives any intra-muscular injection. • Reason is increased susceptibility of the relevant anterior horn cells resulting in settling of the circulating polio virus there and consequential paralysis.

  11. What are the symptoms? • Many include fever, pharyngitis, headache, anorexia, nausea, and vomiting. Illness may progress to aseptic meningitis and menigoencephalitis in 1% to 4% of patients. These patients develop a higher fever, myalia and sever headache with stiffness of the neck and back.

  12. Clinical Pattern of Polio

  13. Virus travels through blood and the nerves … And each place in the cord that nerve cells are destroyed causes paralysis of that part of the body controlled by those motor neurons.

  14. POLIO ATTACKS MOTOR NEURONES

  15. Poliomyelitis:Clinical Features • In 1% of cases virus invades CNS: • Multiples and destroys anterior horn cells. • In severe cases, poliovirus may attacks motor neurones in brainstem, leading to difficulty in swallowing, speaking and breathing

  16. Equanous deformity • Tibialis anterior muscle paralysis (most common) • Heel elevated • Toe gait • Achill tendon contracture

  17. Calcaneous deformity • Gastrosoleous muscle paralysis (Cavous foot)

  18. Varous deformity • Peroneal muscle paralysis ,associate with equanuse deformity (paralytic equano varous )

  19. Planovalgus deformity • Tibialis posterior paralysis ( Flat foot )

  20. Paralytic Scoliosis • Paravertebral muscleparalysis ( Pelvic title )

  21. Knee deformities • Hamstring muscle paralysis(Geno recurvatum ) • Quadriceps muscle paralysis ( knee flection contracture )

  22. Treatment • Intensive physiotherapy

  23. Treatment Orthosis

  24. treatment

  25. Inactivated Vaccine Immunity to Poliovirus 1,2,3 Safe, effective Injection No gastrointestinal immunity: Risks of continued circulation of virus in endemic areas Expensive Jonas Salk

  26. Live Vaccine • Live attenuated oral vaccine (Sabin, 1961): • Risks of viral mutation, leading to potential regain of virulence: • Excretion of live virus thru’ faeces • Live vaccine cheaper, and suitable for mass vaccination programmes

  27. Eradicated from developed world in 1960s Remains endemic in 7 countries Eradication plan by WHO by year 2000: not yet achieved, but progress is being made Poliomyelitis:Current Status

  28. THANKS

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