Certified Registered Nurse Infusion (CRNI) Practice Exam

What is the common organism responsible for catheter-related septicemia?

1. Escherichia coli

2. Staphylococcus

3. Streptococcus

4. Bacillus

The correct answer is: Staphylococcus

The common organism responsible for catheter-related septicemia is Staphylococcus, particularly Staphylococcus aureus and coagulase-negative Staphylococci. These bacteria are part of the normal flora of the skin and mucous membranes and can easily enter the bloodstream through an intravascular catheter. The risk of infection increases with the duration of catheter use and improper insertion or maintenance practices. In cases of catheter-related infections, these organisms can quickly proliferate, leading to serious systemic complications, including septicemia. They are particularly adept at forming biofilms on the catheter surface, which can hinder treatment and increase the likelihood of recurrent infections. While Escherichia coli can cause infections, it is more commonly associated with urinary tract infections. Streptococcus species can contribute to infections but are generally less prevalent in catheter-related situations. Bacillus species are often regarded as contaminants rather than primary pathogens in bloodstream infections related to catheters. Understanding the role of Staphylococcus in catheter-related septicemia is crucial for effective infection control and management in clinical settings.