Bernard-Soulier syndrome

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Bernard-Soulier syndrome

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Questions

USMLE® Step 1 style questions USMLE

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A 9-year-old boy is brought to the emergency department by his parents due to prolonged bleeding following a tooth extraction earlier in the day. Past medical history is noncontributory. Temperature is 37.5°C (99.5°F), pulse is 88/min, respirations are 14/min, and blood pressure is 112/62 mmHg. Physical exam shows gingival bleeding and petechiae. Laboratory testing is obtained, and the results are shown below.  
 
Laboratory value  Result
 Hematologic  
 Hemoglobin  12 g/dL 
 Hematocrit  40% 
 Platelet count  95,000/mm3  
 Leukocyte count  9,000/mm3  
Coagulation studies  
 Prothrombin time (PT)  12 seconds 
 Activated partial thromboplastin time (aPTT)  29 seconds 
 Bleeding time*  15 minutes 
*Reference Range: 2-7 minutes  

Which of the following conditions is the patient at greatest risk of developing?   

External References

First Aid

2024

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2021

Bernard-Soulier syndrome p. 417, 432, 733

Summary

Bernard-Soulier syndrome (BSS) is a rare congenital bleeding disorder characterized by thrombocytopenia, unusually giant platelets, and prolonged bleeding time. Patients with BSS typically have prolonged or severe bleeding after minor trauma or surgery and may also develop epistaxis, hematomas, and petechiae. The severity of the condition can vary from mild to life-threatening.