Chest Pain Clinical Trial
Official title:
The Accuracy of the Mini RELF Device Relative to the 12 Lead ECG for the Diagnosis of an Acute Coronary Artery Occlusion in Patients With Coronary Artery Disease.
Patient delay in seeking medical attendance for symptoms of acute ST elevation myocardial infarction (STEMI) is the major obstacle to reduce the current mortality from acute coronary syndromes. The Mini RELF device is a hand held self applicable device intended to detect on an individual basis an elevation of the ST segment that is indicative for an acute coronary occlusion. The investigators aim to evaluate the accuracy of Mini RELF device when it is self-applied on a daily basis by patients with coronary artery disease.
The increasing availability of small hand held medical devices is a novel opportunity to develop a tool that guides patients through the decision-taking processes of seeking medical attendance during symptoms suggestive of acute myocardial infarction. The cornerstone of early diagnosis, risk stratification and treatment is the presence of ST segment elevation during symptoms suggestive of STEMI. Therefore, a hand held medical device that can detect ST segment elevation with high sensitivity and specificity could be a breakthrough in the further reduction of fatality from acute myocardial infarction. A number of conditions of the tool must be fulfilled to allow save use with a low threshold in the general population. Most important is the accuracy to detect any new ST segment elevation related to an acute artery occlusion. For more than 30 years the 12-lead ECG is the gold standard for detection of ST elevation. However, acute coronary occlusions of a posterior or lateral segment are not always detected by the gold standard. Moreover, in the very early phase of acute coronary occlusion, the accuracy 12 lead ECG is inadequate. In a previous study "Diagnostic accuracy of a novel method for detection of acute transmural myocardial ischemia based upon a self-applicable 3-lead configuration" the investigators developed and validated a sensitive and specific 3-lead ECG method (RELF method). The method includes a new lead configuration and a new algorithm to analyze the ECG recordings based on an intra-individual comparisons of ST levels. In summary, a 3-lead recording from a healthy subject or from a patient with an acute coronary occlusion is compared automatically to one or more previous reference recordings from the same individual. The individualized ST shift is used as a decision variable to detect or reject an acute coronary artery occlusion. The RELF method was more accurate then the simultaneously applied 12-lead ECG which had a lower sensitivity and specificity. In that study all recordings were performed by a sophisticated ECG recording system. The RELF method is designed to be applicable also by small hand held ECG devices such as the self-applicable Mini RELF device. In the current study the investigators aim to evaluate the accuracy of Mini RELF device relative to the 12 lead ECG when the device is self-applied on a daily basis by patients with coronary artery disease. In a parallel study (RELF IIb) the investigators aim to evaluate the specificity of the RELF method when it is self-applied by healthy subjects who are representative for future users of the device. ;
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