nutritional anemia 营养性贫血 department of pediatrics soochow university affiliated...
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Nutritional Anemia
营养性贫血
Department of Pediatrics
Soochow University Affiliated Children’s Hospital
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Main Point –要点
Master iron metabolism trait
Master clinical features, diagnosis, therapy and
prevention of nutritional anemia
Know well pathogenesis and laboratory findings of
nutritional anemia
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( 一 ) nutritional iron deficiency anemia, NIDA- 营养性缺铁性贫血
1 、 Introduction- 简介
Definition / describing
Anemia is defined as a pathological process (syndrome) in whic
h hemoglobin (Hb) concentration in red cells is abnormally low, c
onsidering variations as to age, gender, sea-level altitude, as a r
esult of several situations such as chronic infections, hereditary
blood conditions, deficiency of one or more essential nutrients th
at are necessary for the formation of hemoglobin e.g.: folic acid,
B12, B6 and C vitamins, and proteins.
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Therefore, there is no doubt that iron
deficiency is the cause of most
anemia. It is called iron deficiency anemia.
The anemia caused by insufficient dietary iron
uptake, in which the iron storage and
hemoglobin synthesis decreased.
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Clinical characteristics- 临床特征
iron stores serum iron
hemoglobin concentration , hypochromic
microcytic anemia
good response to iron therapy
6mo to 3 yrs
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2 、 IRON METABOLISM- 铁代谢
CONTENTSNew born 75mg/kg
Children35-70mg/kg
Adults
M 50mg/kg
F 35mg/kg
CMOPARTMENTHemoglobin 64%
Storage iron 30%
ferritin
hemosiderin
Myloglobin 3%
Enzyme iron 0.4%
Serum iron 0.4%
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Iron sources- 铁来源
Hemoglobin iron
Dietary iron
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Dietary iron- 饮食铁
High in iron
Red meat/ liver kidney/ oily fish Average iron
Beans / fortified cereals/ dark green
vegetables/ dried fruit/ nuts and seeds Poor in iron
milk
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Iron absorption- 吸收
general absorption 1-20%
Meat/ fish/ chicken 10-25%
Cereals/vegetables 1%
Breast/cow’s milk 50%/10%
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Hemoglobin iron
gastric juice proteolytic
heme
hemolytic
DuodenumUpper jujenum
Non hemoglobin iron
Proteinase
ferric
Ferric reductaseVitCferrous
Mucosal cells
Gl tractFerricTransferring circulation
Liver Spleen Marrow
HCL
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Iron stores and utilizing- 储存和利用
Hb Hb
FeFe
marrow
Fe Fe
heme + globin
RBCiron
Foodiron
LiverSpleenMarrow
SI
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Requirement and excretion – 需求和排泄
demand excretion
adults 1mg/d 1mg/d
4mo-3yr 1mg//kg (15ug/kg/d)
premature 2mg/kg
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3 、 ETIOLOGY & PATHOGENESIS- 病因和病理生理
ETIOLOGY-- 病因 Poor iron stores
Poor dietary intake of iron*
Overdevelop
Chronic bleeding
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Poor iron stores- 铁贮存不足
Premature birth Multiple birth /Low weight birth Cord blood Mother iron reserve
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Poor dietary intake of iron*
- 饮食摄入铁不足
Milk and cereals Factors influencing absorption Diarrhea and infection
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Overdevelop- 发育需求 3-5mo/ 1yr Premature birth Puberty
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Chronic bleeding- 慢性失血
Cow’s milk Hookworm infection Menstruating Others
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Pathogenesis- 病理生理
iron + protoporphyrin IDA
heme + globins hemoglobin
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Hypochromic / microcytic anemia
ID. Iron deficiency- 铁缺乏IDE. Iron deficiency erythropoiesis- 缺铁
性红细胞生成IDA. Iron deficiency anemia- 缺铁性贫血
Enzymes Immune function Skin/mucosal
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4 、 CLINICAL MANIFESTATIONS- 临床表现
Features
Age
The onset of the IDA
The degree of anemia
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Pallor Extramedullary hematopoiesis Mild/ Severe condition
Digestive system
Cardiac function
Neurology/ intellectual
Immune function
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5 、 LABORATORY FINDINGS- 实验室检查
IDA: microcytic/hypochromic + SI↓
Peripheral blood :Hemoglobin level
RBC MCV < 80fl,
MCH < 26ug,
MCHC < 0.31 Bone marrow
Erythroid hyperplasia
Stainable iron
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Concepts – 概念
SI- 血清铁
serum iron
TIBC- 总铁结合力
total iron binding capacity
TS- 转铁蛋白饱和度
transferrin saturation
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IDA: hypochromic/microtytic anemia+ SI↓
SI : < 9-10.7umol/L (12.8-31.3umol/
L) or < 50-60ug/dl (75-175u
g/dl )TIBC : > 62.7umol/L (>350ug/dl)
TS : < 15% ( 30-50% )IDE: SF↓,FEP↑ ( >0.9umol/L or> 50ug/dl)
ID : SF < 12ug/L / marrow iron
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Normal ID IDE IDA
Marrow iron + ++ 0
SF (ug %) 10060 10-20
FEP
SITIBCTS
HbMCVMCH
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6 、 DIAGNOSIS & DIFFERENTIAL- 诊断和鉴别
Diagnosis
Impression : age, feeding, PBL
Diagnosis : biochemical change
Proven by therapy
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Differential Chronic & inflammatory diseases- 慢性或炎
症性疾病 Thalassemia- 地中海贫血 Pulmonary hemosiderosis- 肺含铁血黄素沉
着 Siderblastic anemia- 铁粒幼细胞性贫血
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7 、 TREATMENT- 治疗
General care
Eradicate the causes*
Iron therapy*
transfusion
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Iron therapy- 铁剂Elemental iron : 4-6mg/kg/d
Oral medication
-Types
-Administration
Between meals
Vitamin C
Course
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Table: Ferrous salts ant the iron contents
Ferrous Salts 4mg/kg/d
Ferrous sulfate ( 20% ) 20mg/kg/d
ferrous fumarate (30% ) 13mg/kg/d
Ferrous gluconate ( 11% ) 40mg/kg/d
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IRON THERAPY RESPONSE ( from Nelson )
Time response
12-24 hr Replacement of iron enzymes, subjective improvement
36-48 hr Initial marrow response: erythroid hyperplasia
48-72 hr Reticulocytes peaking 5-7
4-30 days Hemoglobin level
1-3 month Replenish of stores
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Transfusion- 输血 Indications
Severe anemia
Infection
Pre-operation Component : red blood cells Volume : Hb <30g/L, 3-5ml/kg
Hb 30-60g/L, 5-10ml/kg Attentions
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8 、 PREVENTION- 预防
Education
For pregnant women
For interm
Breast milk/cow’s milk
Iron rich supplementary food
Iron-fortified food
For premature infant
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Review: these contents after class, try to make the summary on
The characteristics of iron metabolism in fetus
and infants
The etiology of IDA
Laboratory findings according to the stages
Differentials: esp with thalassemia
Important treatment
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( 二 ) Megaloblastic Anemia
- 巨幼细胞性贫血Similar aspects to IDA
Age
Anemia by inadequate dietary intake
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Pathogenesis
Vitamin12↓ Nucleotide
Folic acid↓ Tetrahydrofolic acid
Folic acid reductase DNA Synthesis↓
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Manifestation & Differential
Pale and puffy neurological involvement Lab findings
-Macrocytic normochromic anemia
-Neutropenia with/ thrombocytopenia
-Marrow film: megaloblastic forms of nucleated RBC
-Serum Vit B12 and /or folic acid
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TREATMENT
General care
Drug therapy
-Vitamin B12 : 25-100ug/ 次, 2-3 times/w ,weeks or to Hb normal ; One high dose :500ug im
-Folic acid : 5-10mg, tid, 2-3w , -Effect
-Other drug : Vitamin C ; B6 ; iron in recovery
Transfusion
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