Feasibility of High Frequency QRS Analysis in Patients With Acute Myocardial Infarction
Recruitment status was: Recruiting
|Study Design:||Observational Model: Case Control
Time Perspective: Prospective
|Official Title:||Feasibility of High Frequency QRS Analysis in Patients With Acute Myocardial Infarction|
- Diagnosis of Acute Myocardial Infarction [ Time Frame: Prior to hospitalization release ]The primary end-point of the study is diagnosis of acute myocardial infarction, based on cardiac biomarkers, ECG changes clinical symptoms and coronary angiography.
- HFQRS analysis for detecting NSTEMI [ Time Frame: Post data processing ]To evaluate the usefulness of HFQRS analysis in early detection of non-ST segment elevation myocardial infarction (NSTEMI).
|Study Start Date:||June 2010|
|Estimated Study Completion Date:||June 2011|
|Estimated Primary Completion Date:||June 2011 (Final data collection date for primary outcome measure)|
Patients with ST segment elevation myocardial infarction, verified by elevated troponin levels
Patients with non-ST segment elevation myocardial infarction, verified by elevated levels of troponin
Chest pain is one of the leading reasons of hospital emergency department (ED) visits worldwide. In the US, approximately 6 million people annually undergo evaluation in the ED for acute chest pain. Despite the wealth of knowledge available about acute coronary syndrome (ACS), this condition continues to be among the most difficult to predict or diagnose. Misdiagnoses may lead to discharge of patients with ACS, who should have been admitted as well as costly unnecessary hospitalizations of patients who do not have ACS.
More than 2/3 of the patients with ACS have unstable angina (UA) or non-ST-elevation myocardial infarction (NSTEMI). Conventional ECG has low sensitivity of less than 50% in diagnosing these conditions. As the initial ECG in the ED is often non-diagnostic in ACS patients, the diagnosis of ST-elevation myocardial infarction (STEMI) during its early stages may also be difficult.
Analysis of high-frequency QRS components (HFQRS), which quantifies changes in the depolarization phase of the cardiac cycle, has been previously reported to be a sensitive method for detection of demand ischemia. Preliminary studies have shown that HFQRS-derived indices can also identify supply ischemia caused by prolonged balloon occlusion, and transient ischemic episodes in patients with chest pain.
Please refer to this study by its ClinicalTrials.gov identifier: NCT01150825
|Soroka University Medical Center|
|Beer Sheva, Israel, 84101|
|Principal Investigator:||Doron Zahger, MD||Soroka University Medical Center|