Healthcare-Associated Infections (HAIs): Prevention and Nursing Priorities

Healthcare-associated infections (HAIs) are a high-yield NCLEX topic because they are common, preventable, and tied directly to bedside nursing actions. This note reviews the four most-tested HAIs, the chain of infection, and the prevention principles you must know.

Definition

• Healthcare-associated infections (HAIs) are infections patients acquire while receiving treatment in a healthcare facility. They were formerly called nosocomial infections.
• The four most common HAIs are CLABSI, CAUTI, SSI, and VAP.
• HAIs prolong hospital stays, increase costs, and can cause death.

Common HAIs and Prevention Strategies

• CLABSI (central line-associated bloodstream infection): use maximal sterile barriers on insertion, chlorhexidine site cleaning, and scrub the hub with alcohol before each access.
• CAUTI (catheter-associated urinary tract infection): avoid unnecessary urinary catheters and remove them as soon as possible. CAUTI is the most common HAI.
• SSI (surgical site infection): give prophylactic antibiotics within 60 minutes before incision; do not shave the surgical site — use clippers if hair removal is needed. Maintain normothermia and blood glucose control.
• VAP (ventilator-associated pneumonia): elevate the head of the bed to 30–45 degrees and provide oral care with chlorhexidine every 2–6 hours.

Chain of Infection

The chain of infection has six links. Breaking any single link prevents transmission.

• Infectious agent — identify and treat the infection.
• Reservoir — clean and disinfect surfaces.
• Portal of exit — use PPE; cover cough.
• Mode of transmission — apply transmission-based precautions.
• Portal of entry — use aseptic technique.
• Susceptible host — support with vaccination, nutrition, and infection prevention.

Hand hygiene is the single most important intervention to break the chain of infection.

Core Prevention Principles

• Insert invasive devices (central lines, urinary catheters) only when absolutely necessary. Perform a daily review of device necessity and remove them as soon as possible.
• Use maximal sterile barrier precautions for central line insertion: sterile gloves, sterile gown, mask, cap, and a large sterile drape.
• Keep the urinary drainage bag below the level of the bladder to prevent backflow. Do not routinely irrigate catheters.
• Administer prophylactic antibiotics within 60 minutes before surgical incision; maintain normothermia and glucose control.
• For ventilated patients, keep HOB at 30–45 degrees and do not routinely change ventilator circuits.
• Perform hand hygiene before and after every patient contact — the leading prevention measure for all HAIs.

Common Exam Traps

• Do not use urinary catheters routinely for incontinence — this increases CAUTI risk.
• Do not place the urine drainage bag above the bladder — this causes backflow and infection.
• Do not shave the surgical site — shaving causes micro-abrasions that increase SSI risk.
• Do not routinely change ventilator circuits — frequent changes increase VAP risk.
• Do not forget to scrub the hub of a central line before accessing it.
• Do not forget that hand hygiene is the single most important infection prevention measure.

Key Takeaways

• The four most common HAIs are CLABSI, CAUTI, SSI, and VAP, and CAUTI is the most common.
• CLABSI prevention: maximal sterile barriers on insertion and scrub the hub before each access.
• SSI prevention: prophylactic antibiotics within 60 minutes before incision; clip — do not shave.
• VAP prevention: HOB at 30–45 degrees and chlorhexidine oral care every 2–6 hours.
• The chain of infection has six links; breaking any link stops transmission.
• Hand hygiene is the single most important infection prevention measure.