Comparison of Accuracy and Clinical Outcomes of a Continuous Noninvasive Hemoglobin Monitor in the Emergency Room Setting

A major issue faced by emergency departments all over the world is overcrowding, resulting from limited resources (i.e. staff, space, equipment) attending to a large of patients that exceeds the physical and/or staffing capacity of the ED. To manage the issue of overcrowding, the system of triage was created to help prioritize each patient's case, based on set criteria to determine time to treatment and/or which treatment is indicated. Our study will contribute to the discovery of more efficient ways of triaging patients based on objective and subjective criteria for decision-making about treatment and disposition, while simultaneously maintaining patient safety.

The investigators achieve this aim by evaluating the efficiency of a noninvasive and continuous total hemoglobin (SpHb) monitor provided by Masimo Corporation (Irvine USA). Standard hemoglobin measurements via central laboratory testing are invasive, painful, time-consuming, have increased lag time for analysis, potentially expose health care workers to blood-borne illness, and delay treatment onset because they require direct blood sampling. The new SpHb monitor potentially offers a new way to evaluate objective criteria about patients to maximize treatment outcomes and appropriate dispositions. The SpHb monitor has the potential to trend hemoglobin monitoring, quicken the detection of acute anemia, and avoid the complications, anxiety, expense, and patient discomfort associated with invasive blood draws.

In the ED setting, there is a need to efficiently triage a patient and designate a disposition for appropriate treatment management and outcomes. Hemoglobin level is an accurate indicator that helps distinguish patients who need early blood transfusion and meet criteria for admission. Noninvasive technology, such as the SpHb device by Masimo, will assist with common goals in emergency medicine: to efficiently and accurately decrease wait times to treatment and disposition, screening patients who have difficult venous access, providing repeated sampling without causing iatrogenic blood loss linked to anemia, and offering an approach that may be used to develop an organized coherent therapeutic plan based on physiologic criteria for the emergency patient as he/she proceeds from the ED to the OR, the hospital general floor, and the ICU.

This study will be performed at the University of Chicago Medical Center in the main adult emergency room. Patients will be examined and enrolled into our study initially by the triage nurse after each person has given his/her written informed consent.

Randomization process will be carried out based on days of the week. Patients will be enrolled in one group every two days. For example, starting on the week when we begin the trial, we will assign Monday patients to the control group, Tuesday patients to the experimental group, Wednesday patients to the control group... Two groups are similar in characteristics. Depending on whether the subject has been randomized into the control or experimental group, we will not use or use the SpHb monitor to obtain measurements. To obtain measurements, we place the probe of the device on the patient's finger and record the hemoglobin level determined by the Masimo Radical-7 Pulse CO-Oximeter.