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Soru

Zorluk: OrtaInfectious Diseases

Match each patient presentation describing a suspected tick-borne illness with the most appropriate targeted antimicrobial therapy.

  • A 52-year-old man with a history of splenectomy residing in Massachusetts presents with fever, jaundice, hemolytic anemia, and a peripheral blood smear revealing intraerythrocytic tetrads.Atovaquone and azithromycin
  • A 26-year-old woman at 12 weeks gestation residing in Connecticut presents with an asymptomatic, 7-cm expanding erythematous patch with central clearing on her right thigh.Oral amoxicillin
  • A 10-year-old boy from North Carolina presents with a high fever, severe headache, and a petechial rash that originated on his wrists and ankles before spreading centrally.Oral doxycycline
  • A 33-year-old man from New York presents with progressive fatigue, a unilateral facial nerve palsy, and an electrocardiogram demonstrating a PR interval of 340 milliseconds.Intravenous ceftriaxone

Cevap

The correct pairings appropriately match the specific tick-borne disease presentation with its guideline-directed antimicrobial therapy: babesiosis with atovaquone/azithromycin, Lyme disease in pregnancy with oral amoxicillin, RMSF in a child with oral doxycycline, and severe Lyme carditis with PR prolongation with IV ceftriaxone.
Each clinical scenario requires specific knowledge of antimicrobial guidelines for tick-borne diseases. Babesiosis requires antiprotozoal therapy (atovaquone and azithromycin). Early Lyme disease in pregnancy necessitates amoxicillin due to doxycycline contraindications. Rocky Mountain spotted fever is a medical emergency requiring doxycycline for all ages, including children. Severe Lyme carditis (PR > 300 ms) mandates parenteral therapy with intravenous ceftriaxone.

Adım Adım Çözüm

1
Analyze the first presentation: a splenectomized patient from an endemic area with hemolytic anemia and intraerythrocytic tetrads.
Diagnosis is babesiosis.
Requires identifying the classic 'Maltese cross' and the associated clinical syndrome.
2
Identify the appropriate treatment for babesiosis.
Match with atovaquone and azithromycin.
This combination is standard first-line therapy for mild to moderate babesiosis.
3
Evaluate the pregnant patient with an erythema migrans rash.
Diagnosis is early localized Lyme disease in pregnancy.
Requires recognizing the pathognomonic rash and the contraindication to standard therapy.
4
Select the appropriate antibiotic for Lyme disease in pregnancy.
Match with oral amoxicillin.
Doxycycline is teratogenic; amoxicillin is safe and effective.
5
Assess the 10-year-old child with a centripetal petechial rash and high fever.
Diagnosis is Rocky Mountain spotted fever (RMSF).
The rash pattern and region strongly suggest RMSF.
6
Determine the correct treatment for RMSF in a pediatric patient.
Match with oral doxycycline.
Doxycycline is the definitive treatment for RMSF and is indicated for all ages, superseding the usual pediatric contraindication.
7
Analyze the patient with facial nerve palsy and PR interval of 340 ms.
Diagnosis is early disseminated Lyme disease with severe carditis.
PR interval > 300 ms indicates significant heart block.
8
Select the appropriate level of therapy for severe Lyme carditis.
Match with intravenous ceftriaxone.
Oral therapy is insufficient for severe cardiac involvement; parenteral therapy is required.

Anahtar Kavram

Selection of targeted antimicrobial therapy for tick-borne diseases must account for the specific pathogen, disease severity, and patient factors (e.g., age, pregnancy, splenic function).
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Infectious Diseases

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