heamat ology taza
DESCRIPTION
by dr.khlid hammasalihTRANSCRIPT
Active bone marrow contain:-
Erythroid cells ………………...give RBCsMyeloid cells ………................give WBCs
Megakaryocytic cells ……….. produce platlets
Normally : myeloid \ erythroid ratio is 2\1In erythroid hyperplasia ( eg. Heamolytic anemia ) this ratio
become less than 2l1
HEAMATOlogyErythropoiesis
Site:
1 ST 8 WEEKS
FROM 8 WEEK UP TO 6 MONTHS
FROM 6 MONTHS AND ONWARDS
IN YOLK SAC
IN LIVERIN BONE MARROW
In infants & young children red & white marrow are involved in hematopoiesis.
In adults red marrow only.
Very important :--
.
.
Factors affecting erythropoiesis:
1- The factory healthy bone marrow
2- primitive material nutrional element
3- manager of factory erythropitin hormone
4- secrtary other hormones
5- workers healthy organs such as liver
Hemoglobin:
It represents about 1/3 of RBC mass.
It consists of a globin molecule attached to 4 heme groups.
In normal adults there are 3 types of Hb:
1. Hb A adult Hb. (97%).
2. Hb F Fetal Hb. (0.5%). Its production decreases after birth.
3. hb A2 (2- 2.5%).
4. at 3-6 th months ther is switching from gama to beta chain hemoglobin so this is age of manifestation of thalassemia.
RBC life span 120 days.
RBC splits into: 1. Globin which enters the protein metabolic pool.
2. Heme is converted into bilirubin which is excreted by the liver
Anemia
Definition:
It means decrease of hemoglobin concentration below t he normal level for age & sex.
Diagnosis:
A- History:
1)presentation & duration
2)history of presenting illness
3)prenatal natal post natal history: Infant and mother's blood type
History of exchange or intrauterine transfusion, and a history of anemia in the early neonatal period Gestational age at birth is important, as premature infants may have iron or vitamin E deficiencies resulting in anemia.
The presence of jaundice or need for phototherapy may signify the presence of an inherited hemolytic anemia.
4)past medical history
a-Hemorrhage (acute or chronic) e.g. Anklystoma, Accidents & Menorrhagia.
b-Jaundice & dark urine (Hemolytic anemia
5)past surgical history.
6)Drug history Drugs can cause anemia through:
- B.M. depression (chloramphenicol & sufa).
- Hemolysis through: G6PD deficiency & autoimmune hemolysis (quinine).
7)nutritional history Nutritional anemia
8) family history Congenital anemia (e.g. thalassemia).
B- Clinical picture: (general C/P of all types of anemia).
Skin, mucosae – pallor, dryness, purpura
Hands – koilonychias, palmar crease pallor
Facies – skull bossing, maxillary hyperplasia
Eyes – jaundice, pallor
Mouth – glossitis, cheilosis, ulcers
Heart – tachycardia, functional murmurs, CCF
Lungs – breathlessness
Abdomen – hepatosplenomegaly
PR – bleeding, occult blood
Others – lymphadenopathy.
C- Investigations: (Steps)
(1) Is it a case of anemia or not? By
a- Hb (15gm%). – In cases of anemia:
b- RBCs count (4-6 million/mm3). the 3 parameters.
c- Hematocrit value (45%).
(2) What is the type of anemia? 3types according to RBCs size & Hb content (blood indices).
a. Microcytic hypochromic.
b. Normocytic normochromic. C. Macrocytic.
(3) What is the cause of anemia?
i. Microcytic hypochromic anemia:
a) Iron deficiency anemia (IDA). d) Chronic infection
b) Thalassemia. e) CRF.
c) Sideroblastic anemia f) Lead poisoning.
ii. Normocytic normochromic anemia:
(a) Hemolytic anemia (except Thalassemia). (c) Aplastic anemia
(b) Hemorrhagic anemia (d) Leukemia
iii. Macrocytic anemia:
A) Anemia of newborn (excluded by age).
B) Megaloblastic anemia.
(4) Classification of normocytic normochromic anemia:
Reticulocytic count
(Normal: 1-2% of RBCs count)
High count low count
Hemorrhagic hemolytic Aplastic leukemia
Coombs test
+ve -ve
Immune non- immune
Iso-immune auto immune congenital Acuired
Blood indices:
1) Mean Corpuscular volume (MCV ):
MCV =
MCV Microcytosis (< 70 fl).
MCV Macrocytosis (>100 fl).
2) Mean corpuscular hemoglobin (MCH):
MCH =
(normal: 27- 32 picogram)
MCH Hypochromic (< 27 picogram).
3) Mean corpuscular hemoglobin concentration (MCHC):
(normal: 33- 37 gram%).
N.B.:
* Coombs' test:
> A test for detection of antibodies against RBCs.
> Either: 1. Direct detects Abs on the surface of RBCs.
2. Indirect detects Abs in plasma.
* Reticulocytic count:
> It is the single test to detect hemolytic anemia.