Summary NR 511 Differential Diagnosis & Primary Care Practicum Final Exam Study Guide.pdf

Impetigo Impetigoiisiaisuperficialibacterialiinfectioniofitheiskin.iItiisiclassifiediintoiprimaryiimpetigo iwhenithereiisiaidirectibacterialiinvasioniofipreviouslyinormaliskiniorisecondaryimpetigo iwhenitheiinfectioniarisesiatisitesiofiminoriskinitrauma.iTheioccurrenceiofisecondary iimpetigoiis ireferreditoiasiimpetiginization. Impetigoiis imostifrequently iobservediinichildreniages i2–5iyearsiofiage,ialthoughiolder ichildreniofianyiageiandiadultsimayialsoibeiaffected.iTheiinfectioniusuallyioccursiin iwarm,ihumidiconditionsiandiisieasilyispreadiamongiindividualsiinicloseicontact.iRisk ifactorsiincludeipoverty,icrowding,ipoorihygiene,iandiunderlyingiscabies. Impetigoiisiprimarily icausedibyiS.iaureus.iGroupiAiStreptococcusi(GAS)icausesia iminorityioficases,ieitherialoneioriinicombinationiwithiS.iaureus.iOccasionally,iMRSAiis idetectediinisomeicases iofiimpetigo. Variantsiofiimpetigoiincludeinonbullousiimpetigo,ibullousiimpetigo,iandiecthyma. • Nonbullous iimpetigo—most icommon iform iofiimpetigo iand ibegins ias ipapules ithat iprogressitoivesiclesisurroundediby ierythema.iWithiniaiweek,itheipapules ieventuallyibecomeipustulesithatienlarge,ibreakidown,iandiformithick,iadherent icrustsiwithiaicharacteristicigoldeniappearance.iLesionsiusuallyiinvolveitheiface iandiextremities.iRegional ilymphadenitisimayioccur,ialthoughisystemicisymptoms iareiusually iabsent.