dr. jitendra patel (mbbs, md) · 2019-09-27 · 2 dr. jitendra patel (mbbs, md) medical educator...
TRANSCRIPT
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Dr. Jitendra Patel (MBBS, MD)
Medical Educator & Researcher
Associate Professor, Department of Physiology
Email: [email protected] Web: www.esphys.weebly.com
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Competency
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No. PY2.5 (Haematology; Blood & Immunity)
Competency Describe different types of Anemia & Jaundice
D/L/Core K/KH/Y
AM Written/Viva voce
Integration Biochemistry (HI) & Pathology (VI)
Concept Definition and classifications of anemia
E. knowledge Oxygen carrying capacity of the blood
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OUTLINE OF LECTURE
Learning Objectives
1. Anemia:
1.1 Definition 1.2 Indicators
1.4 General Clinical Features 1.3 Classification
1.5 Types
2. Polycythemia:
2.1 Types 2.2 Clinical Features
Summary
Key Term & Concept
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LEARNING OBJECTIVES
Define the Term “Anemia”.
List the Indicators of Anemia
Describe the Effect of Anemia on Function of Body
Describe the Classification of Anemia with Example
Describe the Types and Effect Of Polycythemia.
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DEFINITION
Decrease oxygen carrying capacity of blood
• Either due to decrease RBC count
and/or
• Due to decrease Hb content or abnormal Hb in
the blood.
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The main Problem…!!!
Decrease oxygen carrying capacity of blood
• OCC ml/dl =
(Hb in gm/dl * 1.34 ml) + (0.003 ml/mmhg
of PO2/dl)
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Calculate Oxygen carrying capacity of the blood
in 23 year old healthy gentleman (Hb content is
15 gm/dl);
A. 20.1 ml/dl
B. 20.4 ml/dl
C. 50.1 ml/dl
D. Calculation not possible from given data
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MCQ
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Calculate Oxygen carrying capacity of the blood
in 23 year old healthy gentleman (Hb content is
15 gm/dl);
A. 20.1 ml/dL
B. 20.4 ml/dL
C. 50.1 ml/dL
D. Calculation not possible from given data
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MCQ
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INDICATORS
• RBC count
• Hb content
• PCV
• Blood Indices
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Hb content
• Normal Hb content:
Male – 14 to 18 gm/dl
Female – 12 to 16 gm/dl
• Grading of Anemia
Mild – 8 to 10 gm/dl
Moderate – 6 to 8 gm/dl
Severe – below 6 gm/dl
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Physiological varieties of Hb
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Hb A Hb A2 Hb F Gower
I Gower
II Portland
Hb
a2b2 a2d2 a2g2 ζ2ε2 α2ε2 ζ2g2
Minor Hb F: Hb bart’s – γ4
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Reaction of Hb
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Oxy
Hb
Deoxy
Hb
Carbamino
Hb
Carboxy
Hb
Methamo
Hb
Sulf
Hb
Glycosylated
Hb
Hb+O2 Hb - O2 Hb + CO2 Hb+CO Hb-Fe+3 Hb+S HbA1C
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Hemoglobinopathies
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Glutamic acid is replaced by valine at 6th position of beta chain
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β Thalassaemia Major
Less common
Homozygous transmission
Moderate to severe
Total absence of ß chain synthesis
HbF markedly increase
Life span: shorter, death occurs at 17th year
β Thalassaemia Minor
More common
Heterozygous transmission
Mild
Partial synthesis of ß chain
Normal or mild increase
Longer survival
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Hemoglobinopathies
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PCV (Hematocrit)
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Mean Corpuscular Volume (MCV)
1. Mean Corpuscular Volume (MCV)
• The MCV is the average volume of the RBC
• Normal: MCV is 80-100 fL
• Microcytic; Normocytic; Macrocytic.
RBC Indices
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MEAN CORPUSCULAR HEMOGLOBIN
• The MCH is the average weight of Hb in an RBC,
• The reference range for adults is 28-32 pg.
• The MCH is not generally considered in the classification of anemia.
RBC Indices…
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MEAN CORPUSCULAR HEMOGLOBIN CONCENTRATION (MCHC)
• The MCHC is the average concentration of Hb in each individual erythrocyte.
• Normochromic cells range from 30 to 38 g/dL,
• Hypochromic cells are less than 30 g/dL,
• MCHC will never > 38 g/dl, because cell can’t hold Hb beyond its saturation point.
RBC Indices…
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General Clinical Features
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Its Due to …….
• Tissue Hypoxia
Or
• Compensatory Mechanism
General Clinical Features...
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Pallor
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Based on …….
• Aetiology
Or
• Morphology
CLASSIFICATION
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1. Deficiency anemia
Iron deficiency anemia
Megaloblastic anemia
Pernicious anemia
2. Blood loss
Acute
Chronic
3. Aplastic anemia
4. Haemolytic anemia
Sickle cell anemia
Thalassaemia
Heriditary spherocytosis
Due to toxic effect
5. Anemia due to chronic
diseases:
TB & Malignancies
Aetiological Classification (Whitby’s)
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Normochromic
Hypochromic
Normocytic
Microcytic
Macrocytic
Morphological Classification (Wintrobe’s)
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Normochromic
Hypochromic
Normocytic Acute haemorrhagic anemia Haemolytic anemia Aplastic anemia
Anemia of Chronic blood loss
Microcytic Anemia of chronic diseases
Iron deficiency anemia Thalassaemia
Macrocytic Megaloblasic anemia Pernicious anemia
Liver disease
Morphological Classification (Wintrobe’s)
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• Commonest type of nutritional anemia
• Daily requirement of iron: 10-20 mg
• Causes:
1. Inadequate intake 2. Increased loss
3. Increased demand 4. Decreased absorption
• Specific features:
Nail: Koilonychia Tongue:Atrophic glossitis Mouth:angular stomatitis
Iron deficiency anemia
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Iron deficiency anemia. Note microcytic hypochromic red cells in peripheral blood smear
and micronormoblasts in bone marrow with decreased iron store.
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• Due to deficiency of Vit B12 or Folic acid
• Causes:
1. Inadequate intake
2. Malabsorption of vit B12
Gastric cause: pernicious anemia
Intestial cause
3. Incresed demand
4. Due to certain drugs or chemical
Megaloblastic anemia
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General laboratory findings in macrocytic anemia, compared with the normal report.
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Primary (Pathological):
Polycythemia Vera
Secondary:
Physiological
e.g. at high altitude
Pathological
e.g. cardiac failure
TYPES
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• It is pathological condition
• In polycythemia vera the red blood cell count may be 7 to 8
million/cumm and the hematocrit may be 60 to 70 %.
• Polycythemia vera is caused by a genetic aberration in the
hemocytoblastic cells that produce the blood cells
Polycythemia Vera (Erythremia)
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• Whenever the tissues become hypoxic, at high altitudes, or
as in cardiac failure, the blood-forming organs
automatically produce large quantities of extra red blood
cells. This condition is called secondary polycythemia.
• The red cell count commonly rises to 6 to 7 million/cumm
• PCV is about 30 per cent above normal.
Secondary Polycythemia
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• Increased blood viscosity
• Increased blood volume
• May lead to hypertension
• A person with polycythemia vera ordinarily has a
bluish (cyanotic) tint to the skin.
EFFECT ON BODY FUNCTION
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KEY TERM & CONCEPT
A n e m i a
H e m a t o c r i t
M i c r o c y t i c a n d m a c r o c y t i c
N o r m o c h ro m i c a n d hy p o c h ro m i c
H e m o g l o b i n o p a t h i e s
Po lyc y t h e m i a ve ra
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SUMMARY
• Erythrocytes, which make up more than 99 percent of blood
cells, contain hemoglobin, an oxygen binding protein. Oxygen
binds to the iron in hemoglobin.
• Erythrocytes are produced in the bone marrow and destroyed in
the spleen and liver.
• Iron, folic acid, and vitamin B12 are essential for erythrocyte
formation.
• The hormone erythropoietin, which is produced by the kidneys
in response to low oxygen supply, stimulates erythrocyte
differentiation and production by the bone marrow.
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SUMMARY
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Why BMR is high in Anemia (mainly IDA)?
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Assignment/SDL
1. Morphological classification of anemia with an example in tabular form.
2. Summary (SSS)
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1. G K Pal - Textbook of Physiology
2. Indu Khurana - Medical Physiology for UG
3. Dir. Prof. A K Jain - Textbook of Physiology
4. Ganong's - Review of Medical Physiology
5. Guyton and Hall - Textbook of Physiology (International
Edition)
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Suggested Reading
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Just as the science and art of agriculture depend upon chemistry and botany, so
the art of education depends upon PHYSIOLOGY and psychology.
- Edward Thorndike