Internal medicine residents' evaluation of fevers overnight

Blood culture utilization practices among febrile and/or hypothermic inpatients

Background

Predictors associated with the decision of blood culture ordering among hospitalized patients with abnormal body temperature are still underexplored, particularly non-clinical factors. In this study, we evaluated the factors affecting blood culture ordering in febrile and hypothermic inpatients.

Methods

We performed a retrospective study of 15,788 adult inpatients with fever (≥ 38.3℃) or hypothermia (< 36.0℃) from January 2016 to December 2017. We evaluated the proportion of febrile and hypothermic episodes with an associated blood culture performed within 24h. Generalized Estimating Equations were used to determine independent predictors associated with blood culture ordering among febrile and hypothermic inpatients.

Results

We identified 21,383 abnormal body temperature episodes among 15,788 inpatients (13,093 febrile and 8,290 hypothermic episodes). Blood cultures were performed in 36.7% (7,850/ 21,383) of these episodes. Predictors for blood culture ordering among inpatients with abnormal body temperature included fever ≥ 39℃ (adjusted odd ratio [aOR] 4.17, 95% confident interval [CI] 3.91–4.46), fever (aOR 3.48, 95% CI 3.27–3.69), presence of a central venous catheter (aOR 1.36, 95% CI 1.30–1.43), systemic inflammatory response (SIRS) plus hypotension (aOR 1.33, 95% CI 1.26–1.40), SIRS (aOR 1.26, 95% CI 1.20–1.31), admission to stem cell transplant / medical oncology services (aOR 1.09, 95% CI 1.04–1.14), and detection of abnormal body temperature during night shift (aOR 1.06, 95% CI 1.03–1.09) or on the weekend (aOR 1.05, 95% CI 1.01–1.08).

Conclusion

Blood culture ordering for hospitalized patients with fever or hypothermia is multifactorial; both clinical and non-clinical factors. These wide variations and gaps in practices suggest opportunities to improve utilization patterns.

Supplementary Information

The online version contains supplementary material available at 10.1186/s12879-022-07748-x.

Relationship Between the Use of Preprinted Physician Orders for Hospital-Acquired Fever and Time to Blood Culture Collection: A Single-Center Retrospective Cross-Sectional Study

Purpose

Fever is relatively common in patients admitted to general wards. There is no standardized approach, and little is known about how physicians respond to fever. Additionally, preprinted physician orders are routinely used clinically in hospital medicine, and it is not clear how preprinted physician orders for fever affect the care of patients with fever. Therefore, we aimed to determine whether preprinted physician orders for inpatients have an effect on the time from fever measurement to blood culture collection.

Patients and Methods

This was a single-center, retrospective, cross-sectional study of patients with bacteremia. Between January 1, 2015 and December 31, 2019, 137 hospitalized febrile patients diagnosed with bacteremia by blood culture prepared from blood collected 72 h after hospitalization were included.

Results

Preprinted physician orders with instructions to call the physician if the patient has a fever were present for 59 patients. For preprinted physician orders with instructions to notify the physician about fever onset, 62.7% of the blood cultures were collected within 1 h of fever observation; when preprinted orders were not used, only 23.1% met the 1-h collection criterion. Multivariate analysis showed that preprinted physician orders were significantly associated with blood culture collection within 1 h from the reporting of fever (odds ratio, 4.94; 95% confidence interval, 2.27–10.70).

Conclusion

Preprinted physician orders with instructions to notify the physician about fever onset were present for only 40% of our sample, and this was related to the time of blood culture collection.