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84 Cards in this Set

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Erythrocyte Membrane Composistion:

1. Proteins (50%)


2. Lipids (40%)


3. Carbohydrates (10%)

Protein Components of


RBC Membrane:

Integral Protein:


Glycophorin A & Component A



Peripheral Protein:


Spectrin & Actin

Glycophorin A


- Sialic Acid, (-) charge zeta potential, RBCs repel each other



Actin


- Maintain Biconcave Shape of RBC membrane deformability

External Surface Components:

1. Phospholipids


2. Phosphatidylcholine


3. Glycolipid


4. Sphingomyelin

Internal Surface Components:

1. Phosphatidylethanolamine


2. Phosphatidylinositol


3. Phosphatidylserine

Cholesterol content of the membrane depends upon the

1. Conc of Plasma Chole & Bile Acids


2. Activity of LCAT

LCAT - Lecithin:Cholesterol Acyltransferase



Ovalocyte - Dec Chole

Metabolic Pathways on Erythrocyte:

1. Embden - Meyerhof Pathway


2. Hexose Monophosphate Shunt (Oxidative Pathway)


3. Rapaport - Luebering Pathway


4. Methemoglobin Reductase

Pathway of Anaerobic Glycolysis (90%)



Maintains cellular energy by generating ATP

Embden - Meyerhof Pathway

Glycolysis - Breakdown of Glucose from erythrocytes



*For every glucose broken down to lactic acid yields Two ATPs


Controls flow of Na & K

Pathway that prevents denaturation of globin of the hgb molecule by oxidation



Energy system couples oxidative catabolism of glucose with reduction of NADP to NADPH which is required to reduce glutathione



Aerobic Pathway


10% Glycolysis

Hexose Monophosphate Shunt (Oxidative Pathway)

Needed to neutralize oxidants to prevent denaturation of globin

Reduced Glutathione

Defective Hexose Monophosphate shunt yields insufficient reduced glutathione, therefore globin is denatured and then precipitates as aggregates referred to


Heinz Bodies



*G6PD Def

Pathway that generates 2,3 DPG (2,3 BPG Biphosphoglycerate) which regulate hemoglobin affinity to oxygen

Rapaport - Luebering Pathway

Dec 2,3 DPG - Inc Hemoglobin Affinity to Oxygen


(SHIFT TO THE LEFT)



Inc 2,3 DPG - Dec Hemoglobin Affinity to Oxygen


(SHIFT TO THE RIGHT)

Pathway that functions in the maintenance of heme iron in a functional state (Ferrous, Fe2+) requires the reducing action of NADH and enzyme methemoglobin reductase

Methemoglobin Reductase Pathway

A condition in which there is an Inc concentration of Hemiglobin which is a derivative of hemoglobin in which iron is oxidized to the ferric state

Methemoglobinemia

As RBC Ages, there is a

1. Dec in its Size, Emzymes, ATP


2. Inc in Density

Approximately ___% of the RBCs leave the circulation each day and are broken down by the _________

1%



Mononuclear Phagocyte System (MPS)

Destruction of RBCs outside of blood vessel



Splenic or Macrophage Phagocytosis



Also called macrophage-mediated hemolysis



90% Aged RBC Destruction

Extravascular

*When complement is not activated or incompletely activated



Inc


1. Unconjugated Bilirubin


2. Urine & Fecal Urobilinogen

Occurs when hgb breaks down in the blood and free Hgb is realeased into plasma



Free Hgb binds to Haptoglobin, Hemopexin, & Albumin and is phagocytized by liver macrophages



10% Aged RBC destruction

Intravascular

*When complement is completely activated



HAPTOGLOBIN - major free hemoglobin transport protein

Variation in Cell Size

Anisocytosis

An index of variation of cell volume in a RBC population



Correlates w/ degree of anisocytosis



Calculated by dividing SD by the mean of the red cell distribution

Red Cell Distribution Width (RDW)

Normal sized RBC


6-8 um in dm


MCV 80-100 fL

Normocytic

Normocytic RBC:

1. Acute Blood Loss


2. Hemolytic Anemia


3. Aplastic Anemia

AHA

Small RBC


<6 um in dm


MCV <80 fL

Microcytic

Microcytic RBC:

1. Anemia of Chronic Inflammation


2. Thalassemia


3. IDA


4. Sideroblastic Anemia

ATIS

Large RBC


>8 um in dm


MCV >100 fL

Macrocytic

Macrocytic RBC:

1. Bone Marrow Failure


2. Chronic Liver Dse


3. Megaloblastic Anemia


4. Myelodysplastic Syndrome


5. Reticulocytosis

BCMMR

Variation of color of erythrocytes caused by unequal hemoglobin Concentration

Anisochromia

Central pallor does not exceed 1/3 RBC dm


MCHC 31-36%

Normochromic

AHA

Central Pallor


> 1/3 RBC dm


MCHC <31%

Hypochromic RBC

ATIS

No Central pallor


MCHC >36%

Hyperchromic


New Term: Spherocyte

Hereditary Spherocytosis


- Inc OFT Test (d/t Na Chloride)

Blue-gray tint to RBC


Pink Cytoplasm



Young RBC contain residual RNA



Stained w/ Brilliant Cresyl Blue, show up as Reticulocytes

Polychromatophilic RBC

1. Hemolysis


2. Hemorrhage

Presence of hypochromic cells and normochromic cells in the same film

Dimorphic Anemia

1. Sideroblastic Anemia


2. Weeks after iron therapy for IDA


3. Hypochromic Anemia after blood transfusion w/ normal cells

Alterations or variations in the shape of erythrocytes

Poikilocytosis

Dec ESR

Oval or Egg-like



Seen in:


1. Vit B12 & Folate Def


2. RBC in Retic Stage

Oval Macrocytes (Megalocytes)

Nuclear maturation lags behind cytoplasmic maturation



Impaired ability of cells to synthesize DNA

Asynchronous Development


Megaloblastic Anemia

Small, dense RBC, w/ few irregularly spaced projections of varying length



Inc Spingomyelin over Lecithin


(Abn L:S Ratio)

Acanthocyte


Spur, Thorn Cell

MANS


1. McLeod Syndrome


2. Abetalipoproteinemia


3. Neuroacanthocytosis


4. Severe Liver Dse

RBC w/ blunt or pointed, short projections, evenly spaced



Crenation d/t Osmotic Imbalance (loss of intracorpuscular water)

Echinocyte (Artifactual)


Crenated, Sea Urchin


Burr Cell (Pathologic)

1. Uremia


2. Liver Dse


3. Heparin Therapy


4. Pyruvate Kinase Def


5. Renal Insufficiency


6. Artifact (Hypertonic, Drying)

RBC w/ hemoglobin conc in the center & around the periphery resembling a target



Inc surface:volume ratio



Excessive cholesterol in the membrane or Hgb distribution Imbalance

Codocyte


Mexican Hat,


Target Cell,


Bell

1. Hemoglobinopathies


2. Thalassemia


3. Liver Dse

Thinner variant of codocyte



Central portion not completely datached from the outer membrane

Leptocyte

1. Hepatic Disorders


2. IDA


3. Thalassemia

Small, round, dense RBC with no central pallor



Dec Surface:Volume Ratio



Spectrin Def

Spherocyte

1. Hereditary Spherocytosis


2. Immune Hemolytic Anemia


3. Extensive Burns (W/ Schistocytes)

RBC w/ slit-like area of central pallor



Caused by Osmotic changes d/t Cation Imbalance (Na/K)

Stomatocyte

1. RH NULL SYNDROME


2. Hereditary Stomatocytosis


3. Acquired (Liver Dse, Alcoholism)


4. Artifact

Cigar shaped



Defect in the cytoskeleton, Dec Membrane protein band 4.1 defect

Elliptocyte

1. Hereditary Elliptocytosis


2. Anemias assoc w/ malignancy


3. Hb C dse


4. Hemolytic Anemias (Occasionaly)


5. IDA


6. Sickle Cell Trait


7. Thalassemia


8. Pernicious Anemia

Thinner variant of Ovalocyte

Pencil or Oat Cell

IDA

1. Fragmented RBC due to rupture in peripheral circulation



2. RBC fragment in shape of helmet, Horn-like projections



3. Resemble Pinched Bottle, Triangular RBC w/ 2 Pallor Areas

1. Schistocytes


Schizocytes, Fragmentocytes


Greek: Cloven, schizo:split



2. Helmet Cell (Keratocyte)



3. Knizocytes


(Pinch Cell)

MET


1. Microangiopathic Hemolytic Anemia


2. Extensive Burns


3. Traumatic Cardiac Hemolysis

RBC w/ a single pointed extension resembling a teardrop or pear



Squeezing and fragmentation d/t splenic passage

Dacryocyte (Teardrop)

1. Primary Myelofibrosis


2. Myelophthisic Anemia


3. Thalassemia


4. Megaloblastic Anemia

Abnormality in membrane protein



Heat Sensitive


Inc when blood cells are heated in vitro at 45C

Microspherocyte, Pyropoikilocyte

Normal RBC fragment @ 49C

Large, pale-pink staining ghost of the red cell

Semilunar Bodies, Half-moon,


Crescent Cell

1. Malaria


2. Conditions causing overt hemolysis

Result from gelation of polymerized deoxygenated


Hgb S



Polymerization of Hgb S is influenced by both lowered oxygen levels & dec blood pH

Depranocyte


(Sickle Cells)


Holly-leaf shape

Sickle Cell Anemia

RBC Inclusion that is round, purple staining nuclear fragments of DNA



Feulgen Reaction (+)

Howell-Jolly Bodies

Appear Singly in:


1. Hemolytic Anemia


2. Splenectomy


3. Splenic Atrophy in Sickle Cell Anemia



Appear Multiple in:


1. Megaloblastic Anemia


2. Other forms of nuclear maturation defect

RBC Inclusion that is coarse or fine, deep blue to purple granules



Result from aggregation of Ribosomes

Basophilic Stippling


(Punctuate Basophilia)

Fine stippling:


1. Increased Polychromatophilia (Inc pxn of RBC)


Coarse Stippling:


1. Lead Poisoning


2. Other dses w/ impaired Hgb synthesis


3. Megaloblastic Anemia


4. Other forms of severe anemia


5. Abnormal instability of the RNA in the young cell



Pyrimidine-5-Nucleotidase Deficiency


PICA (Children: Lead Poisoning, Adult: IDA)


Acoholism

Thin ring-like structure



May represent a part of the Mitotic Spindle, remnants of microtubules, or a fragment of the nuclear membrane



Figure of 8

Cabot Rings

1. Megaloblastic Anemia or in severe anemias


2. Lead Poisoning


3. Dyserythropoiesis (Erythrocytes are destroyed before being released from bone marrow)

Round, refractile inclusions not visible on wright stain, best ID by supravital staining



Consist of denatured globin

Heinz Bodies

1. G6PD Deficiency


2. Unstable Hgb (Hb Zurich, Hb Koln)


3. Oxidant Drugs, Chemicals


4. Exposure to sulfonamides or similar drugs


5. Splenectomized Patients



Pitted Golf Ball


- Multiple Heinz Bodies


Bite & Blister Cells


- Splenic pitting of Heinz Bodies

Seen with Brilliant Cresyl Blue stain and appear as blue globules



Precipitate of Hgb B Chains

Hgb H Bodies

1. Hgb H Disease

Reddish Hexagonal Cytoplasmic Crystal



Gold-Bar



Washington Monument (RODAK)

Hgb C Crystals

Homozygous Hgb C Disease


the crystals form as deoxyhgb C polymerizes

Irregular Reddish cytoplasmic crytals



Glove or Pistol



Washington Monument (Steininger)

Hgb SC Crystals

Heterozygous Hemoglobin SC Disease,


the crystals form as deoxyhgb S & C Polymerizes

Nucleated RBC that contains nonheme iron particles arranged in ring form



Excessive Iron overload in mitochondria of normoblasts; d/t defective heme synthesis

Ringed Sideroblast

Sideroblastic Anemia



*RBCs w/ Iron granules, Hemosiderin (+) Prussian Blue

Non-nucleated cell containing Iron granules



Mature RBCs

Siderocyte

Sideroblastic Anemia

Inclusions composed of


Ferric Iron



Prussian Blue stain preparations appear as multiple dark blue irregular granules at the periphery



On Wright's Stain, appear as Pale Blue clusters

Pappenheimer Bodies (Siderotic)

1. Sideroblastic Anemia


2. Hgbinopathies


3. Hyposplenism


4. Megaloblastic Anemia

Condition associated w/ mitochondrial iron loading in marrow erythroid precursors (ringed sideroblast) and ineffective erythropoiesis

Sideroblastic Anemia

Diagnosis:


1. RBC Indices


2. Microcytic, Hypochromic


3. Inc serum iron & serum ferritin


4. Ringed sideroblasts on Iron stain of BM aspirate

Plasmodium spp. Inclusions

1. P. vivax - Schuffner's Dots


2. P. malariae - Ziemann Stippling


3. P. falciparum - Maurer Dot's


4. P. ovale - James Dots, Schuffner's

Maturation Stage: Rings, Troph, Schizonts, Gametocytes



Transmitted by: Bite of Female Anopheles mosquito


Preferred Stain: Giemsa



Enlarged RBC Size:


P. ovale, P. vivax


Normal RBC Size:


P. falciparum, P. malariae

Plasmodium spp. Infected RBC Population:

1. YOUNG RBCs:


P. ovale, P. vivax


2. MATURE:


P. malariae


3. ALL AGES:


P. falciparum

Resistant to Malaria:


1. Fy (a-b-) - P. vivax, P. knowlesi


2. M-N- - P. falciparum merozoites

Gives tiny rings or occasionally as tetrads inside RBCs



Tetrads may also appear in a Maltese Cross Formation

Babesia spp. (Babesiosis)

Resemble P. falciparum Rings but:


1. No Malarial Pigment


2. No growing troph


3. Vector: Ticks



B. microti


- The most common cause of Babesiosis in US


- Nantucket Fever


- First cluster of cases found in


Nantucket Island, Massachussets

Cells aggregate into random clusters or masses when exposed to various RBC abs



Clumping of RBCs

Agglutination

1. Cold Agglutinin Dse (CAD)


2. Primary Atypical Pneumonia (Mycoplasma pneumoniae infec)


3. Cold Hemeagglutinin Dse (CHD)


4. Cold Agglutination Dse/Syndrome (CAS)

Occurs when an individuals RBCs agglutinate in his own plasma or serum tha contains no specific known agglutinins

Autoagglutination

Represents RBCs arranged in rolls or stacks



Stack of Coin



Prsence of Inc concentrations of globulins & fibrinogen

Rouleaux Formation

1. Multiple Myeloma


2. Macroglobulinemia



*May also be d/t an Artifact as a result of delay in smearing the bld once it has been dropped on the slide



Drop of NSS:


Disperse: Rouleaux


Intact: True Agglutination

Granulocytes & Polymorphonuclears

1. Basophils


2. Eosinophils


3. Neutrophils

BEN



Phagocytes: BEN+M


Monocytes

Non-granulocytes & Mononuclear

1. Monocytes


2. Lymphocytes

Immunocytes:


Lymphocytes

Genetically acquired, autosomal dominant disorder produces hyposegmentation of many of the mature neutrophils



Nuclear shape may resemble dumbbell or a pair of eyeglasses



Pince Nez, Spectacle, Peanut Shaped, Hourglass

Pelger-Huet Anomaly

Pelger-Huet


- Single or Bilobed nucleus



Assoc w/:


1. Pelger-Huet


2. Pseudo-Pelger-Huet


3. CML


4. MDS

Most frequently seen in segmented neutrophils with more than five lobes or nuclear segments



Vit B12 & Folic Acid Def


Enlarged, Oval shaped Erythrocytes

Hypersegmentation

Pseudohypersegmentation may be seen in old segmented neutrophils



Hypersegmented Neutrophil


- Abnormal DNA Synthesis


- Right Shift



Assoc w/ Megaloblastic Anemia

Precipitated mucopolysaccharides that appear as purple red (purple-black) particles seen in leukocytes



Can resemble very coarse toxic granulation

Alder-Reilly Inclusions

1. Hurler (Gargoylism)


2. Hunter


2. Maroteaux-Lamy types of genetic mucopolysaccharidoses

Gigantic, peroxidase-positive deposits represent abnormal lysosomal dev't in neutrophils & other leukocytes such as mono & Lympho



Neutrophils display impaired chemotaxis & delayed bacterial killing of ingested bacteria

Chediak-Higashi Syndrome

Autosomal Recessive Trait



Chediak-Higashi Granules


- Giant red, blue, grayish round inclusions in cytoplasm


- Def in enzymes for phagocytosis


- Peroxidase & Sudan Black (+)



1. Assoc w/ Albinism


2. Recurrent Infections

Genetic condition characterized by presence of Dohle body-like inclusions in neutrophils, eosinophils, & monocytes



Abnormally large and poorly granulated platelets



Thrombocytopenia

May-Hegglin Anomaly

May-Hegglin Inclusions resemble Dohle-bodies

Seen in single or multiple, light-blue staining on Wright-stained blood smear



Predominantly seen in neutrophils, may also be seen in monocytes & lymphocytes



Aggregates of Free Ribosomes of RER (RNA)

Dohle-Bodies

Assoc w/:


1. Viral Infections (Severe)


2. Burns


3. Certain Drugs (Toxic States)

Prominent dark (purple-black) granulation, either fine or heavy, can be observed in band & segmented neutrophils & monocytes



Azurophilic (Primary) granules,


Peroxidase (+)



Precipitation of Ribosomal Protein (RNA) caused by metabolic toxicity to cells

Toxic Granulation

Resmble Alder Reily



Assoc w/:


1. Infections


2. Toxic States


3. Burns


4. Malignancy


5. Chemical Poisoning

Similar to normal lympho exc. that the nucleus is notched, lobulated, & cloverleaf-like



Occur in CLL



May be artificially produced thru blood smear prep

Reider Cells

Natural artifact produced during blood smear prep



Bare nuclei of lympho & neutro



Inc Fragility, Inc %



Inc in lymphocytosis, particularly CLL

Smudge Cells/Basket Cell

Degenerated nucleus or ruptured cell



Fragile lymphocytes & break upon smearing

Cytoplasm stains a bright-red color and contains inc quantities of glycogen & intracellular deposits of amorphous matter

Flame Cells

Red-pink Cytoplasm


Inc Cytoplasmic Ig (IgA)



Multiple Myeloma

Plasma cell that contains


small colorless vacuoles



Large protein globules



Cytoplasm completely filled w/ Russell Bodies

Grape or Mott Cells

1. Multiple Myeloma


2. Reactive States



*Russell Bodies - individual globules of IgA

Most common of the lysosomal lipid storage dses



Def of B-glucocerebrosidase (B-glucosidase) which results in the accumulation of cerebroside in (macrophages) histiocytes

Gaucher's Dse

B-glucocerebrosidase (B-glucosidase)


- Enzyme that normally splits glucose from its parent sphingolipid, glucosylceramide

Large cell, with one to three eccentric nuclei and a characteristically wrinkled cytoplasm



"Chicken Scratch"



Strongly Periodic Acid Schiff (PAS) Positive

Gaucher Cell

Disorder represents a def of the enzyme that normally cleaves phosphoryl choline from its parent sphingolipid, sphingomyelin



Sphingomyelin accumulates in the tissue macrophages

Niemann-Pick Disease

Pick Cell


- Similar to Gaucher, but the cytoplasm is FOAMY in appearance

Accumulation of glycolipids & gangliosides



Def of Hexosaminidase A



Vacuolated Cytoplasm

Tay-Sachs

Sandhoff's


- Accumulation of glycolipids & gangliosides


- Def of Hexosaminidase A & B


- Vacuolated Cytoplasm

Blue-Green cytoplasm


Unknown Enzyme Deficient

Sea Blue Histiocytes

Pink or Red, Rod-shaped cytoplasmic structures



Fused primary granules


Found in myeloid & monocytic series only



Peroxidase (+)

Auer Rods

1. AML


2. AMML

Large empty white areas w/in cytoplasm



Represent end stage phagocytosis

Toxic Vacuoles

1. Septicemia


2. Severe Infections


3. Toxic States

Neutrophil w/ large purple homogenous round inclusion w/ nucleus wrapped around



3 Factors needed to produce Cell: ANA, Cell Nuclei, Phagocytes w/ Ingested Material

LE CELL

Lupus Erythematosus