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Scene II: Will Alan ever play for the Lakers?

Scene II: Will Alan ever play for the Lakers?. After this lesson, the students will be able to: Explain x-linked inheritance using Factor VIII deficiency (hemophilia) as an example; Describe the treatment for hemophilia;

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Scene II: Will Alan ever play for the Lakers?

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  1. Scene II: Will Alan ever play for the Lakers? After this lesson, the students will be able to: Explain x-linked inheritance using Factor VIII deficiency (hemophilia) as an example; Describe the treatment for hemophilia; Explain the importance of early diagnosis and carrier testing of hemophilia; and Describe some societal issues associated with hemophilia and its treatment.

  2. Alan’s Situation • Alan suffers a painful knee injury while shooting baskets in his parents’ driveway. Examination at the emergency room indicates that Alan has a bad sprain, in addition to bleeding within the knee joint. Further testing reveals a deficiency of Factor VIII, and a diagnosis of classical hemophilia is made. Stacy is found to have reduced Factor VIII levels, consistent with her being a hemophilia carrier.

  3. Following referral for genetic counseling, Paul and Stacy understand that the gene for Factor VIII is on the X-chromosome. Since Stacy has two X-chromosomes, only half are unable to make usable Factor VIII. The other half make all of the clotting factor that she needs. But Alan happened to inherit from her the X-chromosome unable to make Factor VIII. Because his other sex chromosome is a Y, he has no “back up” gene for Factor VIII. Until his basketball accident, the deficiency went unnoticed. Alan’s Situation (contd.)

  4. AKA: Factor VIII deficiency Blood clotting disorder usually affecting males 1 in 5,000 Abnormal protein “Factor VIII” created Factor VIII necessary for blood clotting Clotting takes longer Severity varies based on amount of Factor VIII produced X-linked disorder (found on X chromosome) What is Hemophilia?

  5. Testing for Factor VIII Blood samples taken and amount of Factor VIII analyzed Testing for Carriers and Prenatal Testing DNA analyzed for gene mutation Hemophilia Testing

  6. Treatments • Factor VIII Replacement: • Intravenous injections of Factor VIII • Causes proteins to help clotting • Joint Replacement • Knee, hip, ankle replacement if arthritis is severe • Regular exercise for strong muscles to protect the weak joints

  7. Alan’s Situation • Alan is starting on Factor VIII home infusion. His parents are taught how to inject Alan with Factor VIII that has been removed from pooled, donated blood, purified and packaged for ready use. The Factor VIII concentration can be kept at home and prepared for injection only when Alan feels that bleeding has occurred. The concentration can also be taken with them on trips.

  8. Factor VIII Infusions • Objective: replace missing clotting factor • When used: • Used at time of bleeding to prevent tissue damage • Prior to and during surgery • Cost: over $100,000/year (beyond lifetime cost of many insurance plans) • Prior to 1984: HIV prevalent in the Hemophilia community (70-90%)

  9. Alan’s Situation • After the increased risk of hepatitis is discussed, immunizations against Hepatitis B and D are scheduled. Stacy is concerned about hemophilia and AIDS. She is assured that while AIDS was a threat to hemophiliacs receiving pooled Factor VIII years ago, more strict donor guidelines and heat-treating of pooled blood reduces the chances of AIDS being a problem for hemophiliacs. Stacy and Paul are reassured. Yet Paul adds, “But let’s see if our insurance will pay for the recombinant Factor VIII.”

  10. Alan’s Situation • Stacy recalls that about a year ago, a boy in Frank’s school was discovered to be HIV positive, presumably from contaminated blood with which he was transfused during heart surgery. Several parents demanded that the boy be removed from school, threatening to remove their own children if their demands were not met. Stacy remembered following the issue in the newspapers. She remembered that the boy and his family moved out of state before the school board or disgruntled parents took any action. At the time, she took no particular position on the issue. What must it have been like for the boy and his family?

  11. Expanding the Chance Family “Stacy, since hemophilia is X-linked and you’re a carrier, it’s important that we contact other family members of yours to discuss their risk of being carriers. Do you have any sisters?” inquires the genetic counselor. “Yes, one. And a brother, David.” “Your sister might also be a carrier. You should bring her up to date on this and ask her to make an appointment with us.” Stacy refuses. “And if you tell her anything about Alan’s hemophilia, I’ll sue you and this place for everything you’re worth.”

  12. Essay #2: Does Martha’s right to know about her risk of being a hemophilia carrier take precedence over Stacy’s right to keep her family’s medical records confidential?

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