5.2 Infection Prevention & Standard Precautions

Endoscopy units perform invasive procedures on a high volume of patients, many of whom carry asymptomatic infections. Standard precautions assume the blood and body fluids of every patient are potentially infectious, regardless of diagnosis or known history. The CGRN nurse applies them consistently and escalates to transmission-based precautions when a specific route of spread is suspected or confirmed. On the exam, the safest first answer for an undifferentiated patient is almost always standard precautions — never wait for a confirmed culture to begin protecting staff and other patients.

Standard Precautions

Standard precautions include hand hygiene; point-of-care, risk-based personal protective equipment (PPE); safe injection practices (one needle, one syringe, one time — never re-enter a multidose vial with a used syringe); respiratory hygiene/cough etiquette; safe handling of contaminated equipment and linens; and environmental cleaning. They apply to every patient encounter in the GI suite, including the recovery bay and reprocessing room. Safe injection practice is heavily tested because outbreaks of hepatitis B and C have been traced to syringe reuse and shared single-dose vials in procedural settings.

The core safe-injection rules the CGRN nurse must apply verbatim:

• Single-dose/single-use vials are for one patient and one procedure, then discarded — do not reserve leftover medication.
• Multidose vials, when unavoidable, are dedicated to a single patient whenever possible and never carried into the procedure (patient treatment) area.
• Use a new needle and new syringe for every entry into a vial or bag; a used syringe contaminates the vial even if the needle is changed.
• Propofol and other lipid-based sedatives support rapid microbial growth, so strict aseptic technique and prompt use are critical.

Transmission-Based Precautions

When standard precautions alone are insufficient, add the route-specific tier. More than one tier can apply simultaneously (for example, droplet plus contact for some respiratory viruses).

For Clostridioides difficile, gloves and gowns are worn, and hands are washed with soap and water because alcohol-based hand rub does not reliably kill spores. Surfaces are disinfected with an EPA-registered sporicidal agent (typically a sodium hypochlorite/bleach formulation at the labeled contact time). A frequent trap answer offers alcohol rub for C. difficile — it is wrong because alcohol leaves viable spores.

Hand Hygiene & PPE Sequence

Hand hygiene follows the WHO '5 Moments': (1) before patient contact, (2) before an aseptic task, (3) after body-fluid exposure risk, (4) after patient contact, and (5) after contact with patient surroundings. Alcohol-based hand rub is preferred for most situations because it is faster and more effective against most vegetative organisms; soap and water is required when hands are visibly soiled and for spore-formers such as C. difficile and Bacillus.

PPE is applied and removed in a defined order to prevent self-contamination:

• Donning order: gown, then mask/respirator, then eye protection, then gloves.
• Doffing order: gloves, then eye protection, then gown, then mask/respirator, then hand hygiene.

Gloves are never a substitute for hand hygiene, and PPE is changed between patients. The logic of doffing is that the most contaminated items (gloves, then gown front) come off first while the respirator — touched least and protecting the airway — comes off last in a clean area, immediately followed by hand hygiene. Touching the front of any item or skipping hand hygiene after doffing are the errors examiners test.

MDROs, Duodenoscope-Related Outbreaks & Surveillance

Multidrug-resistant organisms (MDROs) — carbapenem-resistant Enterobacterales (CRE), VRE (vancomycin-resistant Enterococcus), and MRSA (methicillin-resistant Staphylococcus aureus) — have been transmitted by inadequately reprocessed duodenoscopes during ERCP. These outbreaks drove enhanced measures: strict IFU adherence, double HLD or liquid chemical sterilization, microbiologic surveillance cultures of reprocessed scopes, quarantine until results return ('culture and hold'), and the shift toward disposable-component duodenoscopes.

Surveillance cultures periodically sample high-risk scopes (especially duodenoscopes and linear echoendoscopes) to detect reprocessing failures before patient harm. A positive culture triggers scope removal, root-cause analysis, possible re-reprocessing or repair, and — if a contaminated scope reached patients — a look-back notification. Surveillance supplements, never replaces, meticulous manual cleaning and HLD.

Single-Use Accessories

Many reusable accessories that breach mucosa (biopsy forceps, snares, cytology brushes, sphincterotomes, injection needles) are now single-use to eliminate cross-contamination and the burden of sterilization. Single-use devices are never reprocessed or reused unless processed through a validated, FDA-cleared third-party reprocessing program. Reusing a labeled single-use device informally is both an infection risk and a regulatory violation — a guaranteed wrong answer.

Environmental Cleaning Between Cases

The procedure room is turned over between patients: high-touch surfaces (bed rails, controls, monitor cables, the endoscopy tower) are disinfected with an EPA-registered hospital disinfectant at its labeled wet contact time, and any blood or body-fluid spill is cleaned and disinfected before the surface is reused. For C. difficile and norovirus rooms, a sporicidal (bleach) product replaces the standard disinfectant. Bronchoscopy and procedures on suspected airborne-disease patients require an air-exchange wait time before the room is cleaned and reused.

Single-use bite blocks, mouthpieces, and water bottles are discarded; reusable water bottles and tubing on the irrigation system are reprocessed per IFU because retained water breeds Pseudomonas.