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Early rule-out and rule-in of myocardial infarction using sensitive cardiac Troponin I. 2015

Sophie Druey, and Karin Wildi, and Raphael Twerenbold, and Cédric Jaeger, and Tobias Reichlin, and Philip Haaf, and Maria Rubini Gimenez, and Christian Puelacher, and Max Wagener, and Milos Radosavac, and Ursina Honegger, and Carmela Schumacher, and Valentina Delfine, and Philip Kreutzinger, and Thomas Herrmann, and Zoraida Moreno Weidmann, and Lian Krivoshei, and Michael Freese, and Claudia Stelzig, and Cyril Isenschmid, and Stefano Bassetti, and Katharina Rentsch, and Stefan Osswald, and Christian Mueller
Department of Cardiology and Cardiovascular Research Institute Basel (CRIB), University Hospital Basel, Switzerland; Department of Internal Medicine, Kantonsspital Olten, Switzerland.

BACKGROUND It is currently unknown, whether and to what extent sensitive cardiac troponin (s-cTn) allows shortening of the time required for safe rule-out and rule-in of acute myocardial infarction (AMI). METHODS We aimed to develop and validate early rule-out and rule-in algorithms for AMI using a thoroughly-examined and commonly used s-cTnI assay in a prospective multicenter study including 2173 patients presenting to the emergency department with suspected AMI. S-cTnI was measured in a blinded fashion at 0 h, 1 h, and 2 h. The final diagnosis was centrally adjudicated by two independent cardiologists. In the derivation cohort (n = 1496), we developed 1h- and 2h-algorithms assigning patients to "rule-out", "rule-in", or "observe". The algorithms were then prospectively validated in the validation cohort (n = 677). RESULTS AMI was the adjudicated diagnosis in 17% of patients. After applying the s-cTnI 1h-algorithm developed in the derivation cohort to the validation cohort, 65% of patients were classified as "rule-out", 12% as "rule-in", and 23% to "observe". The negative predictive value for AMI in the "rule-out" group was 98.6% (95% CI, 96.9-99.5), the positive predictive value for AMI in the "rule-in" group 76.3% (95% CI, 65.4-85.1). Overall, 30-day mortality was 0.2% in the "rule-out" group, 1.0% in the "observe" group, and 3.0% in the "rule-in" group. Similar results were obtained for the 2h-algorithm. CONCLUSIONS When used in conjunction with other clinical information including the ECG, a simple algorithm incorporating s-cTnI values at presentation and after 1h (or 2h) will allow safe rule-out and accurate rule-in of AMI in the majority of patients.

UI MeSH Term Description Entries
D008297 Male Males
D008875 Middle Aged An adult aged 45 - 64 years. Middle Age
D009203 Myocardial Infarction NECROSIS of the MYOCARDIUM caused by an obstruction of the blood supply to the heart (CORONARY CIRCULATION). Cardiovascular Stroke,Heart Attack,Myocardial Infarct,Cardiovascular Strokes,Heart Attacks,Infarct, Myocardial,Infarction, Myocardial,Infarctions, Myocardial,Infarcts, Myocardial,Myocardial Infarctions,Myocardial Infarcts,Stroke, Cardiovascular,Strokes, Cardiovascular
D011446 Prospective Studies Observation of a population for a sufficient number of persons over a sufficient number of years to generate incidence or mortality rates subsequent to the selection of the study group. Prospective Study,Studies, Prospective,Study, Prospective
D004636 Emergency Service, Hospital Hospital department responsible for the administration and provision of immediate medical or surgical care to the emergency patient. Emergency Outpatient Unit,Emergency Services Utilization,Hospital Emergency Room,Hospital Emergency Service,Hospital Emergency Services Utilization,Accident and Emergency Department,Emergency Departments,Emergency Hospital Service,Emergency Room,Emergency Units,Emergency Ward,Hospital Service Emergency,Service, Hospital Emergency,Department, Emergency,Departments, Emergency,Emergencies, Hospital Service,Emergency Department,Emergency Hospital Services,Emergency Outpatient Units,Emergency Room, Hospital,Emergency Rooms,Emergency Rooms, Hospital,Emergency Services, Hospital,Emergency Unit,Emergency Wards,Emergency, Hospital Service,Hospital Emergency Rooms,Hospital Emergency Services,Hospital Service Emergencies,Hospital Service, Emergency,Hospital Services, Emergency,Outpatient Unit, Emergency,Outpatient Units, Emergency,Room, Emergency,Room, Hospital Emergency,Rooms, Emergency,Rooms, Hospital Emergency,Service Emergencies, Hospital,Service Emergency, Hospital,Service, Emergency Hospital,Services Utilization, Emergency,Services Utilizations, Emergency,Services, Emergency Hospital,Services, Hospital Emergency,Unit, Emergency,Unit, Emergency Outpatient,Units, Emergency,Units, Emergency Outpatient,Utilization, Emergency Services,Ward, Emergency,Wards, Emergency
D005260 Female Females
D006801 Humans Members of the species Homo sapiens. Homo sapiens,Man (Taxonomy),Human,Man, Modern,Modern Man
D000368 Aged A person 65 years of age or older. For a person older than 79 years, AGED, 80 AND OVER is available. Elderly
D000465 Algorithms A procedure consisting of a sequence of algebraic formulas and/or logical steps to calculate or determine a given task. Algorithm
D015203 Reproducibility of Results The statistical reproducibility of measurements (often in a clinical context), including the testing of instrumentation or techniques to obtain reproducible results. The concept includes reproducibility of physiological measurements, which may be used to develop rules to assess probability or prognosis, or response to a stimulus; reproducibility of occurrence of a condition; and reproducibility of experimental results. Reliability and Validity,Reliability of Result,Reproducibility Of Result,Reproducibility of Finding,Validity of Result,Validity of Results,Face Validity,Reliability (Epidemiology),Reliability of Results,Reproducibility of Findings,Test-Retest Reliability,Validity (Epidemiology),Finding Reproducibilities,Finding Reproducibility,Of Result, Reproducibility,Of Results, Reproducibility,Reliabilities, Test-Retest,Reliability, Test-Retest,Result Reliabilities,Result Reliability,Result Validities,Result Validity,Result, Reproducibility Of,Results, Reproducibility Of,Test Retest Reliability,Validity and Reliability,Validity, Face

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