The haematological system

Chapter 8 The haematological system





The haematological history



Presenting symptoms (Table 8.1)


Patients with anaemia may present with weakness, tiredness, dyspnoea, fatigue or postural dizziness. Anaemia due to iron deficiency is often the result of gastrointestinal blood loss, or sometimes recurrent heavy menstrual blood loss, and so these symptoms should be sought. Disorders of platelet function or blood clotting may present with easy-bruising or bleeding problems. Recurrent infection may be the first symptom of a disorder of the immune system, including leukaemia or HIV infection. The patient may have noticed lymph node enlargement, which can occur with lymphoma or leukaemia. Not all lumps are lymph nodes; consider the differential diagnosis (Table 8.2). Ask about fever, its duration and pattern. Lymphomas can be a cause of chronic fever, and viral infections such as cytomegalovirus and infectious mononucleosis are associated with haematological abnormalities and fever.


TABLE 8.1 Haematological history

























Major symptoms
Symptoms of anaemia: weakness, tiredness, dyspnoea, fatigue, postural dizziness
Bleeding (menstrual, gastrointestinal, after dental extractions)
Easy bruising, purpura, thrombotic tendency
Lymph gland enlargement
Bone pain
Infection, fever or jaundice
Enlargement of the tongue from amyloidosis
Paraesthesiae (e.g. B12 deficiency)
Skin rash
Weight loss

TABLE 8.2 Differential diagnosis of lymphadenopathy













1 Lipoma—usually large and soft; may not be in lymph node area
2 Abscess—tender and erythematous, may be fluctuant
3 Sebaceous cyst—intradermal location
4 Thyroid nodule—forms part of thyroid gland
5 Secondary to recent immunisation






The haematological examination


Haematological assessment does not depend only on the microscopic examination of the blood constituents. Physical signs, followed by examination of the blood film, can give vital clues about underlying disease. Haematological disease can affect the red blood cells, the white cells, the platelets and other haemostatic mechanisms as well as the mononuclear-phagocyte (reticuloendothelial) system.




General appearance


Position the patient as for the gastrointestinal examination—lying on the bed with one pillow. Look for signs of wasting and for pallor (which may be an indication of anaemia—Good signs guide 3.1, page 26). 13 Note the patient’s racial origin (e.g. thalassaemia). If there is any bruising, look at its distribution and extent. Jaundice may be present and can indicate haemolytic anaemia. Scratch marks (following pruritus, which sometimes occurs with lymphoma and myeloproliferative disease) should be noted.



The hands


The detailed examination begins in the usual way with assessment of the hands. Look at the nails for koilonychia—these are dry, brittle, ridged, spoon-shaped nails, which are rarely seen today. They can be due to severe iron deficiency anaemia, although the mechanism is unknown. Occasionally koilonychia may be due to fungal infection. They may also be seen in Raynaud’s phenomenon. Digital infarction (Figure 8.2) may be a sign of abnormal globulins (e.g. cryoglobulinaemia). Pallor of the nail beds may occur in anaemia but is an unreliable sign. Pallor of the palmar creases suggests that the haemoglobin level is less than 70 g/L, but this is also a rather unreliable sign.1



Note any changes of rheumatoid or gouty arthritis, or connective tissue disease (Chapter 9). Rheumatoid arthritis, when associated with splenomegaly and neutropenia, is called Felty’s syndromeb: the mechanism of the neutropenia is unknown, but it can result in severe infection. Felty’s syndrome can also be associated with thrombocytopenia (Figure 8.3), haemolytic anaemia, skin pigmentation and leg ulceration. Gouty tophi and arthropathy may be present in the hands. Gout may be a manifestation of a myeloproliferative disease. Connective tissue diseases can cause anaemia because of the associated chronic inflammation.



Now take the pulse. A tachycardia may be present. Anaemic patients have an increased cardiac output and compensating tachycardia because of the reduced oxygen-carrying capacity of their blood.


Look for purpura (Figure 8.3), which is really any sort of bruising, due to haemorrhage into the skin. The lesions can vary in size from pinheads called petechiae (from Latin petechia ‘a spot’) (Table 8.4) to large bruises called ecchymoses (Table 8.3).


TABLE 8.4 Causes of petechiae































* Eduard Henoch (1820–1910), professor of paediatrics, Berlin, described this in 1865, and Johannes Schönlein (1793–1864), Berlin physician, described it in 1868.


If the petechiae are raised (palpable purpura), this suggests an underlying systemic vasculitis, where the lesions are painful, or bacteraemia.




Epitrochlear nodes


These must always be palpated. The best method is to flex the patient’s elbow to 90 degrees, abduct the upper arm a little and then place the palm of the right hand under the patient’s right elbow (Figure 8.4). The examiner’s thumb can then be placed over the appropriate area, which is proximal and slightly anterior to the medial epicondyle. This is repeated with the left hand for the other side. An enlarged epitrochlear node is usually pathological. It occurs with local infection, non-Hodgkin’s lymphomae or rarely syphilis. Note the features and different causes as listed in tables 8.5 and 8.6. Certain symptoms and signs suggest that lymphadenopathy may be the result of a significant disease (Good signs guide 8.1).



TABLE 8.5 Characteristics of lymph nodes

















During the palpation of lymph nodes the following features must be considered:
Site












TABLE 8.6 Causes of localised lymphadenopathy













1 Inguinal nodes; infection of lower limb, sexually transmitted disease, abdominal or pelvic malignancy; immunisations
2 Axillary nodes; infections of the upper limb, carcinoma of the breast, disseminated malignancy; immunisations
3 Epitrochlear nodes; infection of the arm, lymphoma, sarcoidosis
4 Left supraclavicular nodes; metastatic malignancy from the chest, abdomen (especially stomach—Troiser’s sign) or pelvis
5 Right supraclavicular nodes; malignancy from the chest or oesophagus

GOOD SIGNS GUIDE 8.1 Factors suggesting lymphadenopathy is associated with significant disease











































































  LR if present LR if absent
Age > 40 2.4 0.4
Weight loss 3.4 0.8
Fever NS NS
Head and neck but not supraclavicular NS NS
Supraclavicular 3.2 0.8
Axillary 0.8 NS
Inguinal 0.6 NS
Size:    
< 4 cm2 0.4
4–9 cm2 NS
> 9 cm2 8.4
Hard texture 3.3 NS
Tender 0.4 1.3
Fixed node 10.9 NS
3 or fewer nodes 0.04
5 or 6 nodes 5.1
7 or more nodes 21.9

From McGee S, Evidence-based physical diagnosis, 2nd edn. St Louis: Saunders, 2007.





Cervical and supraclavicular nodes


Sit the patient up and examine the cervical nodes from behind. There are eight groups. Attempt to identify each of the groups of nodes with your fingers (Figure 8.7). First palpate the submental node, which lies directly under the chin, and then the submandibular nodes, which are below the angle of the jaw. Next palpate the jugular chain, which lies anterior to the sternomastoid muscle, and then the posterior triangle nodes, which are posterior to the sternomastoid muscle. Palpate the occipital region for occipital nodes and then move to the postauricular node behind the ear and the preauricular node in front of the ear. Finally from the front, with the patient’s shoulders slightly shrugged, feel in the supraclavicular fossa and at the base of the sternocleidomastoid muscle for the supraclavicular nodes. Causes of lymphadenopathy, localised and generalised, are given in Table 8.7. Note that small cervical nodes are often palpable in normal young people.4,5


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Oct 26, 2017 | Posted by in GENERAL SURGERY | Comments Off on The haematological system

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