What are the possible differential diagnoses for a 38-year-old man with known asthma who presents with a two-day history of productive cough, fatigue, and fever developing within the past 24 hours?

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Differentialdiagnoser for 38-årig mand med astma, produktiv hoste, træthed og feber

Den mest sandsynlige diagnose er samfundserhvervet pneumoni, som skal udelukkes først med røntgen thorax, men differentialdiagnosen skal også omfatte akut bronkitis, astmaeksacerbation, og hos astmapatienter særligt PVL-positiv CA-MRSA pneumoni.

Primære differentialdiagnoser (prioriteret efter sandsynlighed og alvorlighed)

1. Samfundserhvervet pneumoni (CAP)

  • Mest kritisk at udelukke på grund af potentiel morbiditet og mortalitet 1
  • Produktiv hoste + feber inden for 24 timer + kendt astma (øget risiko for komplikationer)
  • Kræver røntgen thorax for at bekræfte eller udelukke infiltrat
  • Hos astmapatienter: Overvej PVL-positiv CA-MRSA pneumoni 2
    • Kan præsentere med akut, svær forløb med sepsis
    • Kræver tidlig empirisk MRSA-dækning hvis svært syg
    • Typisk 2-dages anamnese med dyspnø, produktiv hoste og brystsmerter

2. Akut bronkitis

  • Meget almindelig diagnose ved produktiv hoste < 3 uger 3
  • Kan IKKE diagnosticeres før pneumoni er udelukket radiografisk 3
  • Hos astmapatienter: Op til 1/3 af "akut bronkitis" er faktisk astmaeksacerbation 3
  • Feber kan forekomme men er mindre fremtrædende end ved pneumoni
  • Selvlimiterende, antibiotika ikke indiceret

3. Astmaeksacerbation

  • Kendt astma er væsentlig risikofaktor 4
  • Ofte udløst af viral øvre luftvejsinfektion
  • Produktiv hoste kan være eneste symptom (hoste-variant astma) 4
  • Kritisk advarsel: Astma fejldiagnosticeres som akut bronkitis i ~33% af tilfælde 3
  • Patienter med ≥2 episoder af "akut bronkitis" inden for 5 år har 65% sandsynlighed for mild astma 3

4. Postinfektiøs hoste med bronkial hyperreaktivitet

  • Hvis symptomer varer 3-8 uger bliver det subakut hoste 5
  • Almindeligt efter viral infektion hos astmapatienter
  • Kan manifestere sig som vedvarende produktiv hoste med feber

Sekundære differentialdiagnoser (mindre sandsynlige men vigtige)

5. Allergisk bronkopulmonal aspergillose (ABPA)

  • Skal overvejes hos astmapatienter med produktiv hoste 6, 4
  • Typisk kronisk forløb, men kan præsentere akut 7
  • Isolering af Aspergillus i sputum er suggestivt

6. Bronkiektasi

  • Kronisk produktiv hoste er kardinalsymptom 6
  • Mindre sandsynlig ved kun 2-dages anamnese
  • Overvej hvis recidiverende episoder

7. Andre årsager hos astmapatienter

  • GERD (gastroøsofageal refluks): Kan eksacerbere astma 4, 8
  • Øvre luftvejshoste-syndrom (tidligere postnasal drip): Almindelig komorbiditet 9
  • Vocal cord dysfunction: Kan efterligne astma 4

Diagnostisk tilgang (algoritmisk)

Trin 1: Udeluk pneumoni

  • Røntgen thorax er obligatorisk 3, 1
  • Vurder vitale tegn: Feber >38°C, puls >100, respiration >24 1
  • Auskultation: Fokale rallelyde, dæmpning

Trin 2: Hvis pneumoni udelukket

  • Vurder astmakontrol og spirometri (hvis muligt)
  • Overvej akut bronkitis vs. astmaeksacerbation
  • Husk: Purulent sputum indikerer IKKE nødvendigvis bakteriel infektion 10

Trin 3: Hvis astmaeksacerbation

  • Intensiver astmabehandling
  • Overvej kortikosteroid-kur
  • Udeluk triggere (infektion, allergener, GERD)

Vigtige kliniske faldgruber

  • Undlad IKKE røntgen thorax - pneumoni skal udelukkes før diagnose af akut bronkitis 3, 1
  • Hos astmapatienter: Høj mistanke for astmaeksacerbation frem for "simpel bronkitis" 3
  • PVL-positiv CA-MRSA: Overvej ved svær præsentation hos ellers raske patienter 2
  • Purulent sputum alene retfærdiggør ikke antibiotika ved bronkitis 10

References

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