Healthcare associated infections (HAIs), infections that patients acquire in the process of receiving healthcare, represent one of the most significant patient safety problems in American hospitals. The Centers for Disease Control estimates that on any given day, roughly one in 31 hospitalized patients in the United States has at least one healthcare associated infection. Over a year, this translates to approximately 1.7 million infections and close to 100,000 deaths. The financial cost is estimated at $28 to $45 billion annually. The human cost is immeasurable: patients who enter hospitals for treatment of one condition and acquire a serious infection in the course of that care, often requiring extended hospitalization, additional treatment, and sometimes losing their lives.
Types and Causes
The most common healthcare associated infections include central line associated bloodstream infections (CLABSIs), catheter associated urinary tract infections (CAUTIs), surgical site infections, and Clostridioides difficile (C. diff) infections. Each has distinct mechanisms and prevention strategies, but they share a common feature: they are substantially driven by the behaviors of healthcare workers and the systems in which they work, not by patient characteristics alone. Proper hand hygiene is the single most important prevention measure for virtually all HAI types, yet hand hygiene compliance rates in hospitals have historically been far below what prevention requires, with most auditing finding rates of 40 to 60 percent rather than the near universal compliance that safety requires.
The evidence for evidence based prevention bundles, which package multiple prevention practices together as standard care for high risk procedures and patient populations, is strong and has produced significant reductions in HAI rates in hospitals that implement them with fidelity. The central line bundle, which includes five practices shown to reduce bloodstream infection risk, has been associated with dramatic reductions in CLABSI rates at hospitals that implement it consistently. The challenge is not identifying what prevents infections but building the organizational systems that ensure prevention practices are consistently executed in the complex, high pressure environment of patient care.
Antibiotic Resistance and Stewardship
Healthcare associated infections have a complex relationship with antibiotic resistance that makes the stakes of prevention even higher. Antibiotic resistant organisms, including methicillin resistant Staphylococcus aureus (MRSA), carbapenem resistant Enterobacteriaceae, and C. diff, are concentrated in healthcare settings where patients who have received multiple courses of antibiotics harbor organisms selected for resistance. Antibiotic stewardship programs, which promote appropriate prescribing and use of antibiotics to preserve their effectiveness, are an evidence based approach to slowing the development of resistance within healthcare settings. The CDC's Core Elements of Hospital Antibiotic Stewardship Programs provide a framework that hospitals across the country have used to reduce inappropriate antibiotic use and its consequences.
Measurement and Accountability
Public reporting of HAI rates, mandated for Medicare certified hospitals, creates accountability that has been associated with improvements in infection rates across facility types. Hospitals that know their performance is visible to patients, payers, and regulators invest more in infection prevention infrastructure. The linkage of HAI rates to hospital reimbursement under Medicare's value based purchasing programs creates financial incentives for improvement that reinforce the accountability created by public reporting. These mechanisms are imperfect, since reporting completeness and accuracy vary and the statistical methods for risk adjustment are subject to debate, but they represent a meaningful shift from a system in which HAIs were treated as unavoidable complications to one in which they are treated as measurable, preventable failures with accountability consequences.
