Rotating Shifts, Not Moral Sensitivity, Drive Missed Care in Intensive Care Units

In the high-stakes world of intensive care medicine, a quiet failure mode is gaining attention: care that nurses know they should deliver, but somehow never get to. Researchers call it missed nursing care, and it ranges from delayed medication administration and skipped ambulation to postponed oral hygiene and incomplete documentation. In an intensive care unit, where patients are the most fragile in the hospital, each omission can translate directly into harm. A new cross-sectional study from Iran, published in BMC Nursing, now challenges one of the field’s most intuitive assumptions — that a nurse’s moral sensitivity, the capacity to recognize and respond to the ethical dimensions of patient care, is what stands between intention and action. The findings suggest instead that the structure of the working schedule, particularly rotating shift patterns, may matter far more than any individual ethical disposition.

The research team, led by Fatemeh Bita of Shahed University in Tehran together with colleagues including corresponding author Bahman Aghaie of Qom University of Medical Sciences, set out to answer a deceptively simple question: when ICU nurses leave essential care undone, is the explanation psychological or organizational? Moral sensitivity has long been theorized as a protective factor, with the logic that nurses who perceive ethical problems acutely should be more likely to prioritize completeness of care even under pressure. Yet the theoretical link had rarely been tested against hard occupational variables in the environments where the stakes are highest. The researchers therefore designed their study to pit these two candidate explanations — an individual trait and a set of work-related conditions — against each other in a single statistical model.

Between June and September 2024, the team recruited 178 intensive care nurses from hospitals affiliated with Qom University of Medical Sciences using multistage cluster sampling, a technique that first randomly selects clusters of units or hospitals and then draws participants within them, improving the representativeness of the sample relative to simple convenience recruitment. Notably, the response rate was 100 percent, meaning every nurse approached completed the survey instruments — an unusually complete dataset for nursing research. Data collection relied on two validated tools: the Missed Nursing Care Survey, which asks respondents to report which elements of required care went undone on their shifts, and the Moral Sensitivity Questionnaire, a standard instrument measuring how strongly clinicians perceive and weigh the ethical content of their daily decisions.

The analytical strategy reflected contemporary best practice in observational health research. The team computed correlation coefficients to gauge simple bivariate relationships, then built a multiple linear regression model with robust standard errors, using the HC3 estimator. HC3 is a heteroscedasticity-consistent correction that protects significance tests when the variability of residuals differs across levels of predictors — a common reality in survey data where, for example, nurses with heavy workloads may report missed care with very different scatter than those with lighter loads. The robust approach guards against overstating the precision of estimates in exactly these unequal-variance situations, making the reported confidence intervals more trustworthy than those from ordinary least squares alone.

The headline result was a null finding that carries real weight. The correlation between moral sensitivity and missed nursing care was weak and statistically indistinguishable from zero: a coefficient of -0.055 with a p-value of 0.483. In plain terms, knowing how morally attuned a nurse scored on the questionnaire told you almost nothing about how much care they reported missing. The direction of the association was consistent with the protective hypothesis — higher sensitivity paired with slightly less missed care — but the effect was so small that random noise could easily account for it. This is a striking result, because it suggests that the widely promoted emphasis on ethics training as a lever against care omissions may not translate into measurable behavioral change in the ICU context.

The final regression model, incorporating moral sensitivity alongside occupational characteristics and demographic confounders, explained 15.1 percent of the variance in missed nursing care, or an R-squared of 0.151. Within that model, one occupational factor emerged as the dominant signal: rotating shift work. Nurses on rotating schedules — those who alternate between day and night assignments rather than holding a fixed shift — reported significantly more missed care, with an unstandardized coefficient of 0.535 and a 95 percent confidence interval spanning 0.314 to 0.756, corresponding to a p-value below 0.001. Because the confidence interval sits entirely above zero, the finding is robust at conventional thresholds, and its magnitude suggests rotating shifts are meaningfully associated with the volume of care left undone even after adjustment for other measured variables.

Gender also appeared as a significant predictor, in an unexpected direction. Female nurses reported lower levels of missed care, with a coefficient of -0.664 and a 95 percent confidence interval from -0.983 to -0.345, again reaching statistical significance below 0.001. The authors report this as an association within their sample rather than a causal claim, and the mechanism remains open to interpretation — it could reflect differences in assignment patterns, task distribution, reporting behavior, or genuine differences in how care demands are managed across gender lines in this particular workforce. What is clear is that after adjustment, moral sensitivity itself lost any apparent association with missed care, indicating that whatever weak bivariate relationship exists is confounded by these other characteristics.

The context in which these data were collected is essential to their interpretation. Iran’s healthcare system faces chronic nursing workforce shortages, demanding shift schedules, and nurse-to-patient ratios that range from 1:2 to 1:5 in intensive care settings — ratios substantially leaner than those recommended in many high-resource systems. In such an environment, the researchers argue, the conditions that produce missed care are built into the organization of work itself. A nurse rotating between days and nights contends with circadian disruption, accumulated fatigue, and shifting team compositions, all of which erode the cognitive and physical reserves needed to complete every element of care. When the staffing ratio means one nurse is responsible for five critically ill patients, omissions become almost structurally inevitable, regardless of how ethically committed the individual clinician may be.

The study’s authors are notably careful in framing the practical implications, and that restraint is worth emphasizing. Rotating shift work is a potentially modifiable factor, which makes it an attractive target for intervention — hospitals could, in principle, move toward fixed scheduling or slower rotation cycles. But these are observational, cross-sectional data: a snapshot taken at a single point in time, capturing associations rather than causal pathways. The researchers explicitly state that the findings warrant prospective evaluation in broader multicenter cohorts rather than assuming an established interventional benefit of shift redesign. In other words, before hospital administrators overhaul scheduling systems on the basis of this study, longitudinal research should test whether changing rotation patterns actually reduces missed care, and whether such reductions improve patient outcomes.

Nevertheless, the conceptual shift the study proposes is significant for the nursing profession and for patient safety science more broadly. If moral sensitivity does not predict care omissions in the ICU, then blaming individual ethical failures misdiagnoses the problem and risks wasting resources on interventions with little measurable effect. The evidence points toward systems-level thinking: scheduling architecture, staffing ratios, and workload distribution are where the actionable variance appears to lie. For a field that has invested heavily in ethics education as a quality lever, the message from these 178 Iranian ICU nurses is uncomfortable but clarifying — the ethics of care are only as good as the shift structure that allows them to be enacted, and the path to safer intensive care may run through the rota rather than the conscience.

Subject of Research: Work-related factors and moral sensitivity associated with missed nursing care in intensive care units

Article Title: Beyond moral sensitivity: selected work-related factors associated with missed nursing care in intensive care units

Article References: Beyond moral sensitivity: selected work-related factors associated with missed nursing care in intensive care units. (n.d.). https://doi.org/10.1186/s12912-026-05476-0

Image Credits: AI Generated

DOI: 10.1186/s12912-026-05476-0

Keywords: missed nursing care, intensive care units, moral sensitivity, rotating shift work, nursing workforce, patient safety, cross-sectional study, nurse-to-patient ratios, occupational health, nursing ethics, Iran, BMC Nursing