Neuropathophysiology October 1, 2012 Ashkan Afshin.

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Presentation transcript:

Neuropathophysiology October 1, 2012 Ashkan Afshin

Review Sessions September 17, 20127:30-8:30pmPathogenesis September 24, 20127:30-8:30pmNeuropathophysiology October 1, 20127:30-8:30pmNeuropathophysiology

ALS, MS, GBS  CNS  Demyelinization  Motor Neurons  Life expectancy  Rapid Onset  Muscle weakness

ALS, MS, GBS  Blurred vision  More Common in Elderly  More common in men  Muscle biopsy

MS vs GBS  WHAT IS THE MAIN DIFFERENCE BETWEEN MS and GBS?

MS vs GBS  They affect different types of myelin.myelin  Multiple Sclerosis, it is a demyelinating disease of the central nervous system (CNS) central nervous system (CNS)  Guillain-Barre is a demyelinating disease of the peripheral nervous systemperipheral nervous system  The cells that make up the myelin in the central nervous system (CNS) and peripheral nervous system are different:myelincentral nervous system (CNS)peripheral nervous system  CNS myelin: Oligodendroglia ligodendroglia  PNS myelin: Schwann cells. Schwann cells

GBS  How common is GBS, and how common is it among people who have been vaccinated against seasonal influenza?

GBS  GBS is rare. Medical events occur regardless of vaccination, and background rates are used to assess vaccine safety by comparing the expected rate of disease or death to the actual or observed rate in any given timeframe. The background rate for GBS in the U.S. is about 80 to 160 cases of GBS each week, regardless of vaccination.

GBS  What happened in 1976 with GBS and the swine flu vaccine?

GBS  In 1976 there was a small increased risk of GBS following vaccination with an influenza vaccine made to protect against a swine flu virus. The increased risk was approximately 1 additional case of GBS per 100,000 people who got the swine flu vaccine. The Institute of Medicine (IOM) conducted a thorough scientific review of this issue in 2003 and concluded that people who received the 1976 swine influenza vaccine had an increased risk for developing GBS. Scientists have multiple theories on why this increased risk may have occurred, but the exact reason for this association remains unknown.