Nurse Nutrition Expertise Linked to Better Outcomes in Critically Ill Patients

In the high-stakes environment of the intensive care unit, the difference between recovery and deterioration often hinges on details that never make headlines: the timing of a feeding tube flush, the interpretation of a gastric residual volume, the vigilance of a bedside nurse who notices that a patient is not tolerating their nutrition. A new prospective observational cohort study from Shandong Province, China, now suggests that these details, when managed by nurses with strong nutrition-related knowledge, attitudes, and practices, may measurably alter the trajectory of critical illness itself. The research, published in BMC Nursing by Hong Feng, Rongmei Bi, and Zhixin Meng, tracked 200 mechanically stressed ICU patients receiving enteral nutrition and found that the competency of their responsible nurses was independently associated with lower rates of feeding intolerance, faster declines in a key inflammatory biomarker, shorter intensive care stays, and reduced early mortality.

The study focused on a problem that intensive care clinicians know well: enteral nutrition intolerance. When critically ill patients cannot tolerate feeding delivered directly into the gastrointestinal tract, whether because of delayed gastric emptying, abdominal distension, vomiting, or other complications, clinicians face a painful dilemma. Interrupting nutrition starves the gut lining and may worsen intestinal permeability at precisely the moment the body needs metabolic support, while continuing to feed an intolerant patient risks aspiration, worsening distension, and further physiological stress. The reported incidence of enteral nutrition intolerance varies widely across intensive care units, and the new study set out to test whether the people administering the feeding, rather than the patients receiving it, might account for part of that variation.

To capture nursing competency in a quantifiable form, the researchers used the knowledge-attitudes-practices framework, a long-standing model in health services research that evaluates what clinicians know, how they feel about the importance of that knowledge, and how consistently they translate both into daily practice. Each enrolled patient was assigned to a high-KAP or low-KAP group based on the total nutrition KAP score of the nurse primarily responsible for their care. The design is elegant in its simplicity but also carries inherent limitations: patients were not randomized to nurses, and sicker patients could plausibly have been assigned differently. The investigators addressed this concern statistically by adjusting their analyses for age, sex, and admission APACHE II score, a widely used severity-of-illness index that quantifies physiological derangement on intensive care admission.

The primary endpoint of the study was the longitudinal trajectory of serum procalcitonin, a peptide precursor of the hormone calcitonin that has become one of the most closely watched biomarkers in critical care. Procalcitonin rises sharply in response to bacterial infection and systemic inflammation, and its dynamics over days can signal whether a patient’s inflammatory burden is resolving or escalating. Using a linear mixed-effects model, a statistical approach well suited to repeated measurements nested within individual patients, the researchers found that patients cared for by high-KAP nurses showed a more favorable declining trajectory after enteral nutrition was initiated. At day three of feeding, the estimated marginal mean procalcitonin level was 1.12 plus or minus 0.53 micrograms per liter in the high-KAP group, compared with 1.65 plus or minus 0.62 micrograms per liter in the low-KAP group. By day seven, the gap persisted: 0.76 versus 1.24 micrograms per liter.

This biomarker finding is the most intriguing element of the study because it hints at a biological mechanism rather than a mere process-of-care difference. The authors frame the result in terms of the systemic inflammatory response: better nursing management of enteral nutrition may protect the intestinal barrier, reducing bacterial translocation and the downstream inflammatory cascade that procalcitonin reflects. The gut in critical illness is not a passive conduit for calories but an immunologically active organ whose integrity influences the entire body. When feeding is delivered skillfully, with appropriate rate titration, head-of-bed positioning, monitoring of gastric residual volumes, and early recognition of intolerance, the intestinal mucosa may be better preserved, and the inflammatory signals that flood the bloodstream when the barrier fails may be blunted. The procalcitonin trajectories in this study are consistent with that physiological story, though the observational design cannot prove causation.

The clinical outcomes reinforced the biomarker signal. The crude incidence of enteral nutrition intolerance was 21 percent among patients cared for by high-KAP nurses, less than half the 45 percent observed in the low-KAP group. After multivariable adjustment for age, sex, and APACHE II score, higher nurse KAP remained independently associated with lower risk of intolerance, with an adjusted odds ratio of 0.57 and a 95 percent confidence interval of 0.32 to 0.98. The confidence interval is narrow enough to exclude no effect, though it also indicates appreciable statistical uncertainty, a reminder that a single cohort of 200 patients cannot settle the question definitively.

Length of stay and ventilation duration told a similar story. Patients in the high-KAP group spent fewer days in the intensive care unit, with an adjusted beta coefficient of minus 1.38 days and a 95 percent confidence interval spanning minus 2.67 to minus 0.09, and spent fewer days on mechanical ventilation, with an adjusted beta of minus 1.12 days and a confidence interval of minus 2.21 to minus 0.03. Both confidence intervals exclude zero, but only barely at their upper bounds, and the clinical meaning of a day or so of difference must be weighed against the possibility of residual confounding. Still, the direction of every measured association pointed the same way, which lends the overall pattern credibility even where any single estimate is modest.

The starkest contrast appeared in survival. Crude 28-day all-cause mortality was 9.0 percent in the high-KAP group compared with 21.0 percent in the low-KAP group, a difference of twelve percentage points in a population where every death is a tragedy and every avoided death a triumph. The authors did not report a fully adjusted mortality estimate in the abstract, and with only 200 patients the number of deaths is small enough that chance cannot be excluded as an explanation. Nevertheless, the finding aligns with a broader literature linking nutrition quality in critical care to survival, and it provides a compelling rationale for the interventional studies that the authors argue should follow.

What makes this study resonate beyond its statistical tables is what it implies about the invisible architecture of hospital care. Intensive care medicine celebrates its ventilators, dialysis machines, and precision pharmacology, yet the daily execution of something as mundane as feeding a patient depends on the accumulated knowledge of the nurse at the bedside. The knowledge-attitudes-practices framework captures a chain that runs from education through motivation to action, and the Shandong findings suggest that strengthening the first link may ripple all the way through to inflammatory biology and survival. The authors observed six participating intensive care units in Shandong Province and concluded that targeted training focused on nurses’ nutrition-related KAP merits further evaluation, a deliberately cautious recommendation that acknowledges the limits of an observational design.

Those limits deserve emphasis for readers weighing the findings. Patients were enrolled prospectively, but the exposure, the competency of their nurse, was not randomized, and unmeasured differences between the units, shifts, or patient populations could contribute to the observed associations. The study was approved by the Ethics Committee of Qilu Hospital of Shandong University under approval number KYLL-2025SL-350 and conducted according to the Declaration of Helsinki, with informed consent obtained from participating nurses and a waiver of written patient consent for the use of de-identified routine clinical data. The authors report no external funding and no competing interests. Within those constraints, the study offers a provocative and clinically actionable hypothesis: that investing in the nutrition education of intensive care nurses is not a soft measure but a potential determinant of inflammatory resolution, feeding tolerance, and survival. If randomized training interventions confirm these associations, the humble task of feeding the sickest patients in the hospital may take its rightful place among the measurable levers of critical care medicine.

Subject of Research: Associations between ICU nurses' nutrition knowledge-attitudes-practices and clinical outcomes in critically ill patients receiving enteral nutrition

Article Title: Associations between nurses’ nutrition knowledge, attitudes, and practices and systemic inflammatory response, feeding tolerance, and clinical prognosis in critically Ill patients– a prospective observational cohort study in intensive care units

Article References: Feng, H., Bi, R., & Meng, Z. (2026). Associations between nurses’ nutrition knowledge, attitudes, and practices and systemic inflammatory response, feeding tolerance, and clinical prognosis in critically Ill patients– a prospective observational cohort study in intensive care units. BMC Nursing. https://doi.org/10.1186/s12912-026-05487-x

Image Credits: AI Generated

DOI: 10.1186/s12912-026-05487-x

Keywords: intensive care, enteral nutrition, nursing, procalcitonin, feeding intolerance, critical illness, nutrition knowledge-attitudes-practices, observational cohort, inflammatory response, mechanical ventilation, ICU outcomes, nurse training