Cleaning, Disinfection, & Sterilization Flashcards

A flexible bronchoscope, which contacts mucous membranes of the respiratory tract, is used on a patient. According to Spaulding's classification, what is the minimum level of reprocessing required for this instrument before its next use?

Answer: High-level disinfection

According to Spaulding's classification, medical devices are categorized based on the risk of infection involved with their use. A flexible bronchoscope contacts mucous membranes and is classified as a semicritical item. Semicritical items require, at a minimum, high-level disinfection to eliminate all microorganisms, with the exception of a small number of bacterial spores. Sterilization is preferred but not required, while low-level disinfection and cleaning alone are insufficient for these devices.

A sterile processing technician tests the ortho-phthalaldehyde (OPA) solution used for high-level disinfection and finds the concentration is below the minimum effective concentration (MEC). What is the most appropriate immediate action?

Answer: Discard the solution and prepare a fresh batch according to the manufacturer's instructions.

The minimum effective concentration (MEC) is the lowest concentration of a high-level disinfectant's active ingredient that is still effective. If a test strip indicates the concentration has fallen below the MEC, the solution is no longer reliable for high-level disinfection and must be discarded, regardless of its expiration date. Extending soak time or adding more concentrate are not validated practices and cannot ensure proper disinfection. Continuing to use the solution poses a significant risk of infection transmission.

What is the primary purpose of using a biological indicator (BI) in a steam sterilization load?

Answer: To directly measure the lethality of the sterilization process by challenging it with highly resistant microorganisms.

A biological indicator contains a known population of highly resistant bacterial spores (e.g., *Geobacillus stearothermophilus* for steam). Its primary purpose is to provide a direct measure of the lethality of the sterilization process. If the spores are killed, it provides a high level of assurance that the process was effective. Verifying physical parameters is the role of mechanical monitoring, and visual confirmation of exposure is the role of chemical indicators.

An Infection Preventionist is advising the Environmental Services department on the terminal cleaning protocol for a room previously occupied by a patient with a confirmed *Clostridioides difficile* infection (CDI). Which instruction is most critical?

Answer: Clean and disinfect the room using an EPA-registered sporicidal agent.

*Clostridioides difficile* produces spores that are highly resistant to standard hospital disinfectants, such as quaternary ammonium compounds. Therefore, it is critical to use a disinfectant with sporicidal activity, as specified by the EPA (List K), to effectively decontaminate the environment and prevent transmission. While good ventilation and adjunct technologies like UV-C are important, they do not replace the fundamental need for manual cleaning with a sporicidal chemical agent.

Which of the following pieces of non-critical patient care equipment requires, at a minimum, low-level disinfection between patient uses?

Answer: A blood pressure cuff used on a patient's intact skin

A blood pressure cuff that only comes into contact with intact skin is considered a noncritical item. Noncritical items have the lowest risk of transmitting infection and require, at a minimum, low-level disinfection. Surgical forceps (critical), laryngoscope blades (semicritical), and vaginal speculums (semicritical) all contact sterile tissue or mucous membranes and require higher levels of reprocessing (sterilization or high-level disinfection).

A sterile processing department staff member discovers a wrapped instrument set is damp after being removed from a steam sterilizer and allowed to cool. What is the most significant patient safety concern associated with this 'wet pack'?

Answer: The moisture provides a pathway for microorganisms to wick through the packaging, compromising sterility.

A wet pack is considered contaminated because moisture can act as a vehicle, or 'wick,' for microorganisms from the outside environment to travel through the packaging material to the instruments inside. This compromises the sterility of the pack and poses a direct risk of surgical site infection if the instruments are used. While instrument damage and ergonomic risks are valid concerns, the immediate threat to patient safety is the loss of sterility.