thalassemia major minor & other subtypes soumaditya
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DESCRIPTION22september 2011, GLT medical College Kolkata88, India..............under Pathology Dept!!!!!!!!1Dr.S.K.Mandal.........chief speakers aVIK bASU, Chirantan Mnadal, Urmimala Bhattacharya, Soumaditya Banerjee!!!!!!!!!
- 1. THALASSEMIA MAJOR MINOR & OTHER SUBTYPES
SOUMADITYA BANERJEE, 5THSEMESTER STUDENT
Moderator: Dr Santosh Kumar Mondal
2. 3. CASE STUDY:
Afour years old male child suffering from growth retardation, irritability ,anorexia till infancy.
O/E :1. pallor marked, huge enlargement of liver & spleen
2.no marked lymphadenopathy,
3. depressed nasal bridge
4. 5. Classification of beta thalassemia:
6. BETA THALASSEMIA MAJOR:
Highest incidence in south east asia , Mediterranean countries & parts of africa..
types of genetic mutations seen:
7. Clinical features:
anemiaappear during 6-8 months of age
history of repeated blood transfusion
dilatation of heart withfeature ofheart failure
facial & other bony anomalies.
9. CLINICAL FINDINGS AT DIAGNOSIS:
Clinical manifestation emerge during second sixth month of life.
Diagnosis always evident by 2nd yr.
Pallor , irritability , abdominal swelling ,jaundice are usual symptoms.
11. Radiograph shows:
12. Additional skeletal changes are observed in the metacarpals, metatarsals, and phalanges, where expanded medullary cavities produce a rectangular and then a convex shape .
Irregular fusion of the epiphyses of the proximal humerus results in characteristic shortening of the upper arms.
13. Hypercoaguable state:
A chronic hypercoagulable state has been observed even in childhood . It has been demonstrated that procoagulant phospholipids are exposed on the surface of the red cells and that platelets and the hemostatic system are activated in thalassemia major.
In addition, vascular endothelial cell injury and the peroxidative status due to iron overload have been proposed as possiblemechanism.
1.prior to transfusion d/t extramedullary hematopoeisis .
2. with transfusion iron overloadadd a new reason to this.
3.this also increase chance of hepatocellular carcinoma.
Cardiac abnormalities are important causes of morbidity and mortality .
Cardiac enlargement secondary to anemia is almost always present.
myocardial hemosiderosis and serious iron-induced cardiac diseases were inevitable .
Patients exhibit primarily restrictive defects; others experience mild to moderate small-airway obstruction and hyperinflation.
Most patients have a decreased maximal oxygen uptake and anaerobic threshold; these do not normalize after transfusion.
17. Beta thalassemia minor:
spleen may be palpable
mostly detected in adults as a case ofchronic anaemia
18. :important feature:
Thisoccurs mainly in endemic areas of malaria.
symptomatic with moderate anemia
may have splenomegaly, bone deformity
recurrent leg ulcers ,gall stones ,infections
pt. may be iron overloaded.
20. Alpha thalassemia:
21. Clinical manifestations:
22. Silent carrier:
+-Thalassemia trait has no consistent hematologic manifestations.
The red blood cells are not microcytic, and Hb A2 and Hb F are normal.
During the newborn period, small amounts (3%) of Hb Bart (4) can be seen by electrophoresis or other techniques.
This condition is most often recognized when an apparently normal individual becomes the parent of a child with Hb H disease after mating with a person with -thalassemia trait.
23. -Thalassemia Trait (-Thalassemia Trait)
Levels of Hb A2 in the low to low normal range (1.5%2.5%)
/ synthetic ratios averaging 1.4 : 1 characterize -thalassemia trait.
During the perinatal period, elevated amounts of Hb Bart are noted (3%8%).
Microcytosis is present in cord blood erythrocytes.
24. HbH disease:
HbH disease is common in Southeast Asia and relatively frequent in Mediterranean countries and parts of the Middle East,
25. Subjects with HbH disease may develop complications including hypersplenism, leg ulcers, and gallstones.
Hypersplenism has been reported in 10% of Thai patients with HbH disease, but seems to be rare elsewhere .
Iron overload is not common and has been reported only in some older patients and as a result of repeated blood transfusions
Hb Bart hydropsfetalis syndrome is the most severe -thalassemia clinical condition, often associated with the absent function of all four -globin genes
A fetus homozygous for 0-thalassemia produces mainly Hb Bart (4), which is functionally useless for oxygen transport, and his or her survival to late pregnancy is due to the presence of small amounts of embryonic hemoglobins Portland 1 (22) and Portland 2 (22
27. severe anemia (Hb level range, 3 to 8 g/dl) marked
signs of cardiac failure,
extensive extramedullary erythropoiesis in many organs .
Other congenital abnormalities: particularly of the skeletal, cardiovascular, and urogenitalsystem
28. Complication during pregnanacy:
Complications during pregnancy are common
mild pre-eclampsia (hypertension, fluid retention with or without proteinuria),
polyhydramnios or oligohydramnios
Postpartum complications include :placenta retention, eclampsia (fits and coma), hemorrhage, anemia, and sepsis.
29. Ththank you