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Published on: November 8, 2024
Significance of platelet function diagnostics for clarification of suspected battered child syndrome
R Knöfler1, J Lohse, J Stächele
1Priv.-Doz. Dr. med. Ralf Knöfler, Medizinische Fakultät der TU Dresden, Klinik und Poliklinik für Kinder- und Jugendmedizin, Bereich Pädiatrische Hämostaseologie, Fetscherstr. 74, Tel. +49/(0)351/458 47 99, Fax +49/(0)351/458 57 88,
Insights
Unexplained childhood bleeding requires extensive coagulation testing. Specific platelet function tests, not the PFA-100®, are crucial for diagnosing inherited thrombocytopathies like aspirin-like defects.
Area of Science:
- Pediatric Hematology
- Coagulation Disorders
- Platelet Function Testing
Background:
- Childhood bleeding disorders necessitate comprehensive coagulation work-ups, especially when battered child syndrome is suspected without typical injuries.
- Diagnostic tests must identify common defects (e.g., von Willebrand syndrome, hemophilia) and rare inherited thrombocytopathies.
Observation:
- The PFA-100® test often yields normal results in mild inherited thrombocytopathies, hindering diagnosis.
- Specific platelet function testing is required but faces limitations including availability, pre-analytical issues, and interpretation challenges, particularly in infants.
Findings:
- Two cases of aspirin-like defect (inherited thrombocytopathy) were diagnosed despite normal PFA-100® closure times.
- Platelet aggregometry revealed pathological findings, enabling accurate diagnosis of these specific platelet function defects.
Implications:
- Highlights the limitations of PFA-100® in diagnosing certain inherited thrombocytopathies.
- Emphasizes the critical role of specialized platelet function tests, like aggregometry, for accurate diagnosis in pediatric bleeding disorders.
- Suggests re-evaluation of diagnostic algorithms for unexplained childhood bleeding to include advanced platelet function assays.
Abstract:
The manifestation of an unclear bleeding tendency in childhood calls for an extended coagulation work-up, particularly when a battered child syndrome is suspected and typical concomitant injuries are absent. The chosen diagnostic tests should be able to detect the presence of relatively common coagulation defects such as von Willebrand syndrome or hemophilia, but also rare diseases such as inherited thrombocytopathies. The PFA-100® test does not help to provide a definite diagnosis especially in cases of mild inherited thrombocytopathies, since in most cases the PFA-100® test results are normal. For this purpose, specific platelet function testing is needed. However, the methods are only available in some coagulation laboratories. Also, other limitations need to be taken into consideration such as pre-analytical problems and difficulties in the interpretation of test results especially in infants. We present two cases that were diagnosed with an aspirin-like defect as an inherited thrombocytopathy, even though their PFA-100 closure times were within the normal range. Based on pathological findings in the platelet aggregometry test, this diagnosis could be made.
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