Association between nursing workload and staff size with the occurrence of adverse events and deaths of patients with COVID-19: A retrospective cohort study.

Background: The safety of patients in the intensive care unit (ICU) is significantly impacted by inadequate staffing of nursing professionals to meet the demand for care of critically ill patients. COVID-19 patients increased nurses' workload, particularly in high-intensity care settings like the ICU.

Aim: To evaluate the association of workload and number of patients per nursing professional with the occurrence of adverse events and death in critically ill patients with COVID-19 in the ICU.

Study Design: This is a retrospective cohort study. This study analysed patients with COVID-19, aged 12 years or older, admitted between 1 April 2020 and 31 May 2021 in the ICU of a hospital in Brazil. Nursing workload was measured by the Nursing Activities Score (NAS). The independent variables were the ratio of the NAS score per nursing professional (NNR) and the ratio of the number of patients per nursing professional (PNR). Dependent variables included adverse events (pressure injuries and health care-associated infections-HAIs) and death in the ICU.

Results: Of the 386 included patients, 59.59% were male and the median age was 60.5 years. The median NAS, NNR and PNR values were 72.81%, 128% and 1.64, respectively. The frequency of pressure injuries (31.09%) exceeded that of HAIs (16.06%), and 218 patients (56.48%) died. The NNR was associated with HAIs (OR 1.006; CI95% 1.001-1.012; p = .012), pressure injury (OR 1.005; CI95% 1.000-1.010; p = .033) and death (OR 1.010; CI95% 1.005-1.015; p < .001) in the ICU. There was no association between PNR values and the study's dependent variables.

Conclusion: A high workload per nursing professional was associated with the occurrence of adverse events and deaths of patients with COVID-19 in the ICU, while the nursing staff sizing was not.

Relevance To Clinical Practice: The results reinforce the importance of evaluating the workload of nursing professionals to establish safety measures for the care of patients with infectious diseases.