Caring for critically ill patients requires expertise from healthcare professionals in various disciplines. This interprofessional team model is essential to enhance patient outcomes and team performance (1). The critical care dietitian is a key member of the interprofessional team with specialized expertise and complementary functions. The following discussion outlines the necessary, expansive, and evolving role of the dietitian for knowledge acquisition, dissemination, and translation within an evolving epoch in critical care nutrition (CCN), defined by the impact of emerging information on practice paradigms.
THE IMPACT OF NUTRITIONAL RISK ON CRITICAL CARE OUTCOMESMalnutrition and critical illness have a bidirectional relationship, as both contribute to an increasing degree of nutritional risk (2-4). Nutritional risk is independently associated with more patient complications, increased mortality, greater length of hospital stay, and higher healthcare costs (5,6).Since the 1974 seminal article by Butterworth (7) highlighting the iatrogenic and underrecognized protein-energy malnutrition among hospitalized patients, the past 5 decades have provided us with a better understanding of critical illness pathophysiology and how various nutritional interventions can play a salutary role. Critical illness-induced host inflammatory and immune responses impair gastrointestinal functions. These include impaired epithelial barrier function and gut dysbiosis, which incite gut-derived inflammation and multiple organ dysfunction syndrome (8). The provision of early enteral nutrition (EN) provides a distinct benefit, primarily by maintaining gut barrier functions (9). Additionally, survivorship from critical illness has increased in the past 3 decades (10). Unfortunately, survival is oftentimes accompanied by critical illness-related sarcopenia, protein-energy malnutrition, and impaired quality of life (11-17).These selected examples of the bidirectional relationship between deterioration of nutritional status and critical illness highlight the clear need for expertise in nutrition assessment, diagnosis, and monitoring, as well as implementation of nutritional strategies to modify and even redirect disease trajectory.