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Transcript of Vv | | Langford Veterinary Services Ltd is a wholly owned subsidiary of the University of Bristol...
![Page 1: Vv | | Langford Veterinary Services Ltd is a wholly owned subsidiary of the University of Bristol Leucocytes.](https://reader036.fdocuments.us/reader036/viewer/2022062409/5697bfc21a28abf838ca5143/html5/thumbnails/1.jpg)
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| www.langfordvets.co.uk | Langford Veterinary Services Ltd is a wholly owned subsidiary of the University of Bristol
Leucocytes
Kathleen Tennant
Clinical Lead, Diagnostic Laboratories
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| www.langfordvets.co.uk | Langford Veterinary Services Ltd is a wholly owned subsidiary of the University of Bristol2
![Page 3: Vv | | Langford Veterinary Services Ltd is a wholly owned subsidiary of the University of Bristol Leucocytes.](https://reader036.fdocuments.us/reader036/viewer/2022062409/5697bfc21a28abf838ca5143/html5/thumbnails/3.jpg)
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| www.langfordvets.co.uk | Langford Veterinary Services Ltd is a wholly owned subsidiary of the University of Bristol
Leucocyte measurement
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| www.langfordvets.co.uk | Langford Veterinary Services Ltd is a wholly owned subsidiary of the University of Bristol
Leucocyte measurement
• Most methods use a mixture of impedence properties and optical scatter/ granularity to derive total numbers and a differential
• Fluorescence can give another way of differentiating cell types
• Information from the graphs can help you to understand how it has derived the differential….
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| www.langfordvets.co.uk | Langford Veterinary Services Ltd is a wholly owned subsidiary of the University of Bristol
What cell type will the blue ones be?
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| www.langfordvets.co.uk | Langford Veterinary Services Ltd is a wholly owned subsidiary of the University of Bristol
What cell type?
• Neutrophils1.
• Lymphocytes2.
• Monocytes3.
• Eosinophils4.
• Basophils5.
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| www.langfordvets.co.uk | Langford Veterinary Services Ltd is a wholly owned subsidiary of the University of Bristol
Lymphocyte
• Lymphocytes are small compared to the other leucocytes and have round, non- complex nuclei
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| www.langfordvets.co.uk | Langford Veterinary Services Ltd is a wholly owned subsidiary of the University of Bristol
On this scatter plot
• Neutrophils• Lymphocytes• Monocytes• Eosinophils• Basophils are white
• Knowing what the cells look like, you can predict their position and see how cleanly the colours are grouped together
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| www.langfordvets.co.uk | Langford Veterinary Services Ltd is a wholly owned subsidiary of the University of Bristol
Other measures such as granularity and lobularity allow a 5 part differential
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| www.langfordvets.co.uk | Langford Veterinary Services Ltd is a wholly owned subsidiary of the University of Bristol
What leucocyte type will the green dots be?
• Neutrophils1.
• Lymphocytes2.
• Monocytes3.
• Eosinophils4.
• Basophils5.
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| www.langfordvets.co.uk | Langford Veterinary Services Ltd is a wholly owned subsidiary of the University of Bristol
What leucocyte type will the green dots be?
• Neutrophils• Lymphocytes• Monocytes• Eosinophils!• Basophils are white
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| www.langfordvets.co.uk | Langford Veterinary Services Ltd is a wholly owned subsidiary of the University of Bristol
Eosinnophils
• In dogs and cats the most obviously granular nucleated cells will be eosinophils
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| www.langfordvets.co.uk | Langford Veterinary Services Ltd is a wholly owned subsidiary of the University of Bristol
Leucocytes - Neutrophils• Combination of absolute
numbers and morphology changes give the best chance of correctly interpreting.
• Mature neutrophils in three pools – in circulation, marginated and mature pool in the bone marrow
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| www.langfordvets.co.uk | Langford Veterinary Services Ltd is a wholly owned subsidiary of the University of Bristol
Mature neutrophilia
• By redistribution (marrow to blood stream, marginated to free flowing) in response to inflammatory mediators or increased blood pressure
• Decreased loss to tissues in response to corticosteroids often with hypersegmentation
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| www.langfordvets.co.uk | Langford Veterinary Services Ltd is a wholly owned subsidiary of the University of Bristol
Left shift
• Once the mature pool has been stripped from the marrow, if demand outstrips new neutrophil production, earlier precursors released:
• Bands, metamyelocytes, myelocytes• (Unusual for promyelocytes/ blasts to be seen in
peripheral blood)• Presence indicates an acute inflammatory response
that is overwhelming the ability of the marrow to cope
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| www.langfordvets.co.uk | Langford Veterinary Services Ltd is a wholly owned subsidiary of the University of Bristol
Case 6: 3 y.o. Working Labrador with pyothorax – peripheral blood – what is this cell?
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| www.langfordvets.co.uk | Langford Veterinary Services Ltd is a wholly owned subsidiary of the University of Bristol
What is this cell?
• Lymphocyte, reactive 1• Monocyte
2• Band neutrophil
3• Metamyelocyte
4• Myelocyte
5
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| www.langfordvets.co.uk | Langford Veterinary Services Ltd is a wholly owned subsidiary of the University of Bristol
Left shifted neutrophil line
• The white arrow shows a myelocyte – reniform, and the earliest in the neutrophil maturation pool
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| www.langfordvets.co.uk | Langford Veterinary Services Ltd is a wholly owned subsidiary of the University of Bristol
‘Toxic change’
• In response to overwhelming demand, dysmature neutrophils released
• Organelles normally removed before the neutrophil is released persist, other organelles not fully matured
• Cytoplasmic basophilia, doehle bodies, vacuolation, persistent granules (toxic granulation), ring form nuclei
• Often seen alongside left shift
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| www.langfordvets.co.uk | Langford Veterinary Services Ltd is a wholly owned subsidiary of the University of Bristol
Case 6 :Toxic change and left shift
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| www.langfordvets.co.uk | Langford Veterinary Services Ltd is a wholly owned subsidiary of the University of Bristol
Case 6 : Toxic change
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| www.langfordvets.co.uk | Langford Veterinary Services Ltd is a wholly owned subsidiary of the University of Bristol
Lasercyte
• As immature neutrophils contain more RNA, they occupy a recognisable area of the scatter plot in this technology, but the severity of the left shift and toxic change are best evaluated on the smear
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| www.langfordvets.co.uk | Langford Veterinary Services Ltd is a wholly owned subsidiary of the University of Bristol
Neutropenia
• Breed variations (Greyhounds/ sight hounds) and individual variation: if mild, track.
• May be secondary to decreased production with marrow disease/ suppression (esp chemo), increased utilisation with marked inflammation or immune mediated destruction
• With complete marrow destruction or suppression, neutrophils are the first cell line to decrease.
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| www.langfordvets.co.uk | Langford Veterinary Services Ltd is a wholly owned subsidiary of the University of Bristol
Name the cell
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| www.langfordvets.co.uk | Langford Veterinary Services Ltd is a wholly owned subsidiary of the University of Bristol
Name the cell
• Neutrophil1.
• Band neutrophil with toxic change
2.• Lymphocyte
3.• Monocyte
4.
25
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| www.langfordvets.co.uk | Langford Veterinary Services Ltd is a wholly owned subsidiary of the University of Bristol
Monocytes
• Have marginated and circulating pools
• Leave circulation to tissues, differentiate into macrophages with inflammatory cytokines.
• Larger than neutrophils, with a more open nuclear chromatin
• Cytoplasm blue – grey and may be vacolated
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| www.langfordvets.co.uk | Langford Veterinary Services Ltd is a wholly owned subsidiary of the University of Bristol
Monocytosis
• Steroids may move them out of the marginated pool• Many infectious causes: bacterial, fungal, protozoal• Immune mediated disease, sepsis, necrosis, trauma• ? systemic studies on prevalence of diagnostic
categories with monocytosis as a finding – tend to be case reports/ case series
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| www.langfordvets.co.uk | Langford Veterinary Services Ltd is a wholly owned subsidiary of the University of Bristol
Lymphocytes
• Small, normal lymphocytes in circulation are 1 – 1.5 x red cell size with a thin rim of cytoplasm
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| www.langfordvets.co.uk | Langford Veterinary Services Ltd is a wholly owned subsidiary of the University of Bristol
Lymphocytes on the blood smear
• Reactive lymphocytes- Slightly larger- More basophilic- May have a pale
perinuclear zone- Seen more frequently in
young animals- May not reflect function
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| www.langfordvets.co.uk | Langford Veterinary Services Ltd is a wholly owned subsidiary of the University of Bristol
Lymphoblasts
• Large lymphoid cells, larger than neutrophils
• Their presence in circulation is always abnormal
• Look for nucleoli• Generally
lymphoma/ leukaemia in high number
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| www.langfordvets.co.uk | Langford Veterinary Services Ltd is a wholly owned subsidiary of the University of Bristol
Lymphocytosis
• Lymphocytosis in physiological response as well as immune stimulation with few diseases (Ehrlichia, Leishmania, Toxoplasma)
• Addison’s (5 – 10%) of cases• NOT found as a response to vaccination in various
studies (summarised in Avery and Avery (2007) Vet Clin Small Anim 37 p267 – 282)
• Marked lymphocytosis (> 20 x 10^9/L) raises concerns for neoplasia
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| www.langfordvets.co.uk | Langford Veterinary Services Ltd is a wholly owned subsidiary of the University of Bristol
Lymphopenia
• Lymphopaenia is a common finding
• Stressed and diseased animals
• Post steroids and some chemotherapeutics
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| www.langfordvets.co.uk | Langford Veterinary Services Ltd is a wholly owned subsidiary of the University of Bristol
5 y.o. WHWT with cough and skin diease. Name that cell
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| www.langfordvets.co.uk | Langford Veterinary Services Ltd is a wholly owned subsidiary of the University of Bristol
Name that cell
• Basophil1.
• Toxic neutrophil 2.• Eosinophil
3.• Macrophage
4.
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| www.langfordvets.co.uk | Langford Veterinary Services Ltd is a wholly owned subsidiary of the University of Bristol
Eosinophils - eosinophilia
• Commonest causes in dogs – pulmonary infiltrate with eosinophils and GI disease (eosinophilic I.B.D.)
(Lilliehook and Tvedten, Vet Clin North Am Small Anim Pract. 2003 Nov; 33 (6):1359-78
• Eosinophilic leukaemias and paraneoplastic increases also reported
• Hypereosinophilic syndrome (huskies) can give marked elevations of well differentiated cells
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| www.langfordvets.co.uk | Langford Veterinary Services Ltd is a wholly owned subsidiary of the University of Bristol
Eosinophils - eosinopenia• Usually corticosteroid
related (endogenous or exogenous)
• Insulin administration• Diurnal variation in
humans may be reflected in dogs (fewer in the morning)
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| www.langfordvets.co.uk | Langford Veterinary Services Ltd is a wholly owned subsidiary of the University of Bristol
Coughing 2 y.o. Springer Spaniel. Name that cell
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| www.langfordvets.co.uk | Langford Veterinary Services Ltd is a wholly owned subsidiary of the University of Bristol
Name that cell
• Basophil1.
• Toxic neutrophil 2.• Neutrophil containing
Ehrlichia3.
• Eosinophil4.
• Macrophage5.
38
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| www.langfordvets.co.uk | Langford Veterinary Services Ltd is a wholly owned subsidiary of the University of Bristol
Basophils
• In hypersensitivity, parasitic and paraneoplastic responses
• Basophilic leukaemias reported but rare
• Increases in some myelodyplastic syndromes
• Dirofilaria in imported• Decreases generally
unrecognised
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| www.langfordvets.co.uk | Langford Veterinary Services Ltd is a wholly owned subsidiary of the University of Bristol
Sample number 3235
• 12 y ME Bulldog• Lethargy, inappetance, mild
lymphadenomegaly, splenomegaly• Biochemistry unremarkable
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| www.langfordvets.co.uk | Langford Veterinary Services Ltd is a wholly owned subsidiary of the University of Bristol
Leucocytes through the machine
41
WBC 50.30 X 10^9/l 5.50 – 17.00
Neutrophils 10.56 X 10^9/l 3.00 – 11.50
Lymphocytes 37.73 X 10^9/l 0.70 – 3.60
Monocytes 2.01 X 10^9/l 0.10 – 1.50
Eosinophils 0.00 X 10^9/l 0.20 – 1.40
Basophils 0.00 X 10^9/l 0.00 – 0.10
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| www.langfordvets.co.uk | Langford Veterinary Services Ltd is a wholly owned subsidiary of the University of Bristol
Which is the most likely pathology?
• Immune stimulation1.
• Chronic lymphocytic leukaemia2.
• Acute lymphoblastic leukaemia3.
• Stage 5 lymphoma4.
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| www.langfordvets.co.uk | Langford Veterinary Services Ltd is a wholly owned subsidiary of the University of Bristol
Marked lymphocytosis – with other leucocytes unaffected
43
WBC 50.30 X 10^9/l 5.50 – 17.00
Neutrophils 10.56 X 10^9/l 3.00 – 11.50
Lymphocytes 37.73 X 10^9/l 0.70 – 3.60
Monocytes 2.01 X 10^9/l 0.10 – 1.50
Eosinophils 0.00 X 10^9/l 0.20 – 1.40
Basophils 0.00 X 10^9/l 0.00 – 0.10
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| www.langfordvets.co.uk | Langford Veterinary Services Ltd is a wholly owned subsidiary of the University of Bristol
Lymphocytosis
• Cats can have lymphocytosis up to low twenties with immune stimulation
• Can not tell whether leukaemia or stage 5 lymphoma based on smear or bone marrow – needs clinical assessment and observation of progression
• Morphology on the smear needed to tell if acute (poorly differentiated/ large lymphoid cells) or chronic lymphocytic (small/ well differentiated)
44
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| www.langfordvets.co.uk | Langford Veterinary Services Ltd is a wholly owned subsidiary of the University of Bristol
Large granular lymphocytes in very high numbers – suspicious for large granular lymphocyte leukaemia
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| www.langfordvets.co.uk | Langford Veterinary Services Ltd is a wholly owned subsidiary of the University of Bristol
Large granular lymphoid leukaemia can start in spleen as well as marrow
• These lymphocytes can be seen in health and in reactive processes, but not normally in these numbers
• High numbers of Howell – Jolly bodies (arrowed) – seen in red cell regeneration (not here!) and in some animals with splenic disease
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