Hypereosinophilic syndrome
| Hypereosinophilic syndrome | |
|---|---|
| Classification and external resources | |
| Specialty | Lua error in Module:Wikidata at line 446: attempt to index field 'wikibase' (a nil value). |
| ICD-10 | D72.1 (ILDS D72.12) |
| ICD-9-CM | 288.3 |
| ICD-O | 9964/3 |
| OMIM | 607685 |
| DiseasesDB | 34939 |
| eMedicine | article/202030 article/1051555 article/886861 |
| Patient UK | Hypereosinophilic syndrome |
| MeSH | D017681 |
The hypereosinophilic syndrome (HES) is a disease characterized by a persistently elevated eosinophil count (≥ 1500 eosinophils/mm³) in the blood for at least six months without any recognizable cause, with involvement of either the heart, nervous system, or bone marrow.[1]
HES is a diagnosis of exclusion, after clonal eosinophilia (such as leukemia) and reactive eosinophilia (in response to infection, autoimmune disease, atopy, hypoadrenalism, tropical eosinophilia, or cancer) have been ruled out.[2]
There are some associations with chronic eosinophilic leukemia[3] as it shows similar characteristics and genetic defects.[4]
If left untreated, HES is progressively fatal. It is treated with glucocorticoids such as prednisone.[2] The addition of the monoclonal antibody mepolizumab may reduce the dose of glucocorticoids.[5]
Contents
Classification
In the heart, there are two forms of the hypereosinophilic syndrome, endomyocardial fibrosis and Loeffler's endocarditis.
- Endomyocardial fibrosis (also known as Davies disease) is seen in tropical areas.[6][7]
- Loeffler's endocarditis does not have any geographic predisposition.
Signs and symptoms
As HES affects many organs at the same time, symptoms may be numerous. Some possible symptoms a patient may present with include:
Diagnosis
Numerous techniques are used to diagnose hypereosinophilic syndrome, of which the most important is blood testing. In HES, the eosinophil count is greater than 1.5 × 109/L.[4] On some smears the eosinophils may appear normal in appearance, but morphologic abnormalities, such as a lowering of granule numbers and size, can be observed.[4] Roughly 50% of patients with HES also have anaemia.[4]
Secondly, various imaging and diagnostic technological methods are utilised to detect defects to the heart and other organs, such as valvular dysfunction and arrhythmias by usage of echocardiography.[4] Chest radiographs may indicate pleural effusions and/or fibrosis,[4] and neurological tests such as CT scans can show strokes and increased cerebrospinal fluid pressure.[4]
A proportion of patients have a mutation involving the PDGFRA and FIP1L1 genes on the fourth chromosome, leading to a tyrosine kinase fusion protein. Testing for this mutation is now routine practice, as its presence indicates response to imatinib, a tyrosine kinase inhibitor.[8]
Treatment
Treatment primarily consists of reducing eosinophil levels and preventing further damage to organs.[4] Corticosteroids, such as Prednisone, are good for reducing eosinophil levels and antineoplastics are useful for slowing eosinophil production.[4] Surgical therapy is rarely utilised, however splenectomy can reduce the pain due to spleen enlargement.[4] If damage to the heart (in particular the valves), then prosthetic valves can replace the current organic ones.[4] Follow-up care is vital for the survival of the patient, as such the patient should be checked for any signs of deterioration regularly.[4] After promising results in drug trials (95% efficiency in reducing blood eosinophil count to acceptable levels) it is hoped that in the future hypereosinophilic syndrome, and diseases related to eosinophils such as asthma and Churg-Strauss syndrome, may be treated with the monoclonal antibody Mepolizumab currently being developed to treat the disease.[5] If this becomes successful, it may be possible for corticosteroids to be eradicated and thus reduce the amount of side effects encountered.[5]
Epidemiology
HES is very rare, with only 50 cases being noted and followed up in the United States between 1971 and 1982,[4] corresponding roughly to a prevalence of 1 to 2 per million people. The disease is even more uncommon within the paediatric population.[4]
Patients who lack chronic heart failure and those who respond well to Prednisone or a similar drug have a good prognosis.[4] However, the mortality rate rises in patients with anaemia, chromosomal abnormalities or a very high white blood cell count.[4]
References
- ↑ Lua error in package.lua at line 80: module 'strict' not found.
- ↑ 2.0 2.1 Lua error in package.lua at line 80: module 'strict' not found.
- ↑ 3.0 3.1 3.2 3.3 3.4 3.5 3.6 3.7 Lua error in package.lua at line 80: module 'strict' not found.
- ↑ 4.00 4.01 4.02 4.03 4.04 4.05 4.06 4.07 4.08 4.09 4.10 4.11 4.12 4.13 4.14 4.15 Lua error in package.lua at line 80: module 'strict' not found. Last updated: Updated: Oct 4, 2009 by Venkata Samavedi and Emmanuel C Besa
- ↑ 5.0 5.1 5.2 Lua error in package.lua at line 80: module 'strict' not found.
- ↑ Lua error in package.lua at line 80: module 'strict' not found.
- ↑ Lua error in package.lua at line 80: module 'strict' not found.
- ↑ Lua error in package.lua at line 80: module 'strict' not found.
External links
- Hypereosinophilic Syndrome research in UK
- Hypereosinophilic Syndrome on patient.info
- Hypereosinophilic Syndrome on eMedicine
- Hypereosinophilic Syndrome (HES) on American Academy of Allergy, Asthma & Immunology
- Hypereosinophilic syndrome on Mayo Clinic
