Etiology and mechanism of development
From an epidemiological perspective, Werlhof's disease most commonly manifests at a young age. The pathogenesis of the disease has a pronounced autoimmune character: the patient's body begins to actively synthesize autoantibodies targeting its own platelets.
As a result of interaction with antibodies, platelets undergo premature destruction. Although the exact etiology often remains unclear, distinct triggering factors that initiate the pathological process can be identified. These external influences include:
- Acute respiratory viral infections (ARVI).
- Taking certain medications.
Clinical Presentation and Physical Status
The central place in the clinical picture is occupied by cutaneous hemorrhagic syndrome, which is distinguished by a variety of manifestations:
- Purpura: characteristic small hemorrhagic rashes appear on the skin of the hands, chest, neck, and visible mucous membranes.
- Ecchymoses: patients may develop extensive subcutaneous hemorrhages.
In addition to cutaneous manifestations, spontaneous bleeding is characteristic. It is most frequently localized in the nasal cavity, gastrointestinal tract, and uterus.
The most life-threatening condition in this pathology is intracranial hemorrhage. It is extremely important for the clinician to notice its warning signs in time: the onset of unmotivated headache and dizziness.
During physical examination of the abdomen, one should pay attention to the spleen. Splenomegaly is not very typical for Werlhof's disease: the organ enlarges only slightly and is extremely rarely palpable.
Laboratory diagnostics
The diagnosis is confirmed by specific changes in blood and bone marrow tests.
- Hemostasis parameters: an increase in blood clotting time and impaired normal blood clot retraction are consistently detected.
- Platelet count: profound thrombocytopenia is observed. It is important to remember that a decrease in platelet count to critical values (in the range of $20-10 \times 10^9$/L) is the threshold beyond which the risk of spontaneous bleeding increases sharply.
- Myelogram: upon examination of bone marrow punctate, the number of megakaryocytes remains normal or even increases. This fact is crucial evidence that thrombocytopenia is associated with peripheral cell destruction rather than suppressed hematopoiesis.
Principles of treatment
Therapeutic tactics for idiopathic thrombocytopenic purpura are divided into conservative and surgical.
- Drug therapy: the basis of treatment consists of glucocorticoids (specifically, prednisolone) and cytotoxic agents, aimed at suppressing autoantibody production.
- Surgical treatment: splenectomy (removal of the spleen). This surgery is indicated in cases where drug therapy proves ineffective.
Briefly: answers to topical questions
What changes in hemostasis parameters, besides thrombocytopenia, are detected in Werlhof's disease?
In Werlhof's disease, besides thrombocytopenia, an increase in blood clotting time and impaired blood clot retraction are detected. The following changes are characteristic:
- Blood clotting time — a pathological increase is observed.
- Clot retraction — impairment of the retraction of the formed blood clot is detected.
- Bone marrow — in the myelogram, the number of megakaryocytes is normal or increased, which serves as a sign of peripheral platelet destruction by autoantibodies.
How does the cutaneous hemorrhagic syndrome in Werlhof's disease (ITP) visually differ from the hemorrhagic syndrome in hemophilia?
Cutaneous hemorrhagic syndrome in Werlhof's disease is described as purpura — small rashes on the skin (hands, chest, neck) and mucous membranes, as well as ecchymoses with the possibility of extensive subcutaneous hemorrhages.
For hemophilia, sources indicate other hemorrhagic manifestations: soft tissue hematomas/hemorrhages into muscles and soft tissues, hemarthrosis of large joints, as well as bleeding from mucous membranes.
| Sign | Werlhof's disease (ITP) | Hemophilia |
|---|---|---|
| Main visible manifestations | Purpura, ecchymoses | Soft tissue hematomas |
| Skin localization | Skin of hands, chest, neck; mucous membranes | Soft tissues; large joints in hemarthrosis are also indicated |
| Additional | Extensive subcutaneous hemorrhages are possible | Bleeding from mucous membranes is possible |
To understand the myelogram in Werlhof's disease, remember the "whole factory" rule: the bone marrow (factory) works perfectly, there are plenty of megakaryocytes, but ready platelets are destroyed by antibodies right at the exit into the blood (peripheral destruction).
Class and exam questions
Does the spleen enlarge in Werlhof's disease?
Splenomegaly is not a prominent sign of this pathology. The spleen may be enlarged only slightly and is rarely palpable upon physical examination.
What myelogram parameters are characteristic of this disease?
In the bone marrow, the number of megakaryocytes is normal or increased. This indicates that platelets are actively formed but perish in the periphery under the action of autoantibodies.
At what platelet level do spontaneous bleedings begin?
The critical level at which spontaneous, unprovoked bleeding develops is considered to be a drop in platelets to $20-10 \times 10^9$/L.
What symptoms indicate the risk of the most dangerous complication?
The onset of headache and dizziness in a patient may serve as a precursor to intracranial hemorrhage, a condition that poses the greatest danger to life.
What else to study on this topic
- Features of the mechanism of autoantibody formation against one's own platelets
- Differential diagnosis between purpura and ecchymoses on the skin
- Strict clinical indications for performing a splenectomy
- Mechanism of action of prednisolone and cytotoxic agents in the treatment of the pathology
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