More CRNI Study Materials – Study Guide, Practice Questions & Comprehensive
Revision
Staphylococcus aureus - ANS ✔✔the most common gram-positive organism causing septicemia
Staphylococcus aureus
and
Enterococcus - ANS ✔✔the 2 most frequently involved pathogens in catheter-related infections
and sepsis
Intrinsic contamination - ANS ✔✔Contamination that occurs during the manufacturing process
Extrinsic Contamination - ANS ✔✔contamination with microorganisms DURING preparation or
administration
Endogenous contamination - ANS ✔✔Contamination caused by patient's own microflora
Primary endogenous infection - ANS ✔✔Infection caused by the patient's own flora
(e.g. placement of a tunneled catheter exit site near a patient's tracheostomy site may result in
a catheter infection from migration of the patient's own flora around the tracheostomy)
Intravenous catheter can become colonized by microorganisms from a distant site of infection
Secondary endogenous infections - ANS ✔✔Infection caused by modification of the patient's
own flora following prolonged antibiotic administration or Colonization with healthcare setting
flora
Primary causative organisms of intrinsic contamination - ANS ✔✔Enterobacteriaceae
(Enterobacter cloacae, Enterobacter agglomerans, Serratia marcescens, Klebsiella species)
Revision
Staphylococcus aureus - ANS ✔✔the most common gram-positive organism causing septicemia
Staphylococcus aureus
and
Enterococcus - ANS ✔✔the 2 most frequently involved pathogens in catheter-related infections
and sepsis
Intrinsic contamination - ANS ✔✔Contamination that occurs during the manufacturing process
Extrinsic Contamination - ANS ✔✔contamination with microorganisms DURING preparation or
administration
Endogenous contamination - ANS ✔✔Contamination caused by patient's own microflora
Primary endogenous infection - ANS ✔✔Infection caused by the patient's own flora
(e.g. placement of a tunneled catheter exit site near a patient's tracheostomy site may result in
a catheter infection from migration of the patient's own flora around the tracheostomy)
Intravenous catheter can become colonized by microorganisms from a distant site of infection
Secondary endogenous infections - ANS ✔✔Infection caused by modification of the patient's
own flora following prolonged antibiotic administration or Colonization with healthcare setting
flora
Primary causative organisms of intrinsic contamination - ANS ✔✔Enterobacteriaceae
(Enterobacter cloacae, Enterobacter agglomerans, Serratia marcescens, Klebsiella species)
