A Multicenter Randomized Controlled Trial Comparing Central Laboratory and Point-of-Care Cardiac Marker Testing Strategies: The Disposition Impacted by Serial Point of Care Markers in Acute Coronary Syndromes (DISPO-ACS) Trial

• Published in: Annals of emergency medicine Vol. 53; no. 3; pp. 321 - 328
• Main Authors: Ryan, Richard J., MD, Lindsell, Christopher J., PhD, Hollander, Judd E., MD, O'Neil, Brian, MD, Jackson, Raymond, MD, Schreiber, Donald, MD, Christenson, Robert, PhD, Gibler, W. Brian, MD
• Format: Journal Article
• Language: English
• Published: New York, NY Mosby, Inc 01-03-2009; Elsevier
• Subjects: Acute Coronary Syndrome - diagnosis; Adult; Aged; Anesthesia. Intensive care medicine. Transfusions. Cell therapy and gene therapy; Biological and medical sciences; Biomarkers - blood; Clinical death. Palliative care. Organ gift and preservation; Emergency; Emergency Service, Hospital; Female; Humans; Intensive care medicine; Laboratories, Hospital - organization & administration; Length of Stay - statistics & numerical data; Male; Medical sciences; Middle Aged; Point-of-Care Systems - organization & administration; United States; United States; Intensive care; Multicenter study; Cardiovascular disease; Acute coronary syndrome; Coronary heart disease; Myocardial disease; Resuscitation
• ISSN: 0196-0644; 1097-6760
• DOI: 10.1016/j.annemergmed.2008.06.464

Study objective Point-of-care testing reduces time to cardiac marker results in patients evaluated for acute coronary syndromes, yet evidence this translates to a decreased length of stay is lacking. We hypothesized that point-of-care testing decreases length of stay in patients being evaluated for acute coronary syndromes in the emergency department (ED). Methods Patients being evaluated for possible acute coronary syndromes at 4 EDs in the United States were randomized to having point-of-care markers as well as central laboratory markers, or central laboratory markers only (laboratory arm). Point-of-care markers were obtained using early serial testing at presentation and at 90, 180, and 360 minutes as required by the treating physician. Evaluation, treatment, and disposition decisions were at the treating physician's discretion. Length of stay was from presentation to the time of departure from the ED, either to an inpatient setting or to home. Results There were 1,000 patients in each study arm. There were 520 patients discharged home from the ED. Median (interquartile range) time to discharge home was 4.6 hours (3.5 to 6.1 hours) in laboratory patients and 4.5 hours (3.5 to 6.1 hours) in point-of-care patients. Median (interquartile range) time to transfer to an inpatient setting for admitted patients was 5.5 hours (4.2 to 7.5 hours) in laboratory patients, and 5.4 hours (4.1 to 7.3 hours) in point-of-care patients. At one site, time to transfer to the floor was reduced in the point-of-care arm compared with the laboratory arm (difference in medians 0.45 hours; 95% confidence interval [CI] –0.14 to 1.04 hours). At one site, time to ED departure for discharged patients was higher in the point-of-care arm than the laboratory arm (difference in medians 1.25 hours; 95% CI 0.13 to 2.36 hours). Conclusion The effect of point-of-care testing on length of stay in the ED varies between settings. At one site, point-of-care testing decreased time to admission, whereas at another, point-of-care testing increased time to discharge. Potential effects of point-of-care testing on patient throughput should be considered in the full context of ED operations.