Feasibility of High Frequency QRS Analysis in Patients With Acute Myocardial Infarction

The safety and scientific validity of this study is the responsibility of the study sponsor and investigators. Listing a study does not mean it has been evaluated by the U.S. Federal Government. Read our disclaimer for details. Identifier: NCT01150825
Recruitment Status : Unknown
Verified February 2011 by BSP Biological Signal Processing Ltd..
Recruitment status was:  Recruiting
First Posted : June 25, 2010
Last Update Posted : February 8, 2011
Information provided by:
BSP Biological Signal Processing Ltd.

Brief Summary:
The primary objective of this study is to characterize the morphological patterns of high frequency QRS components (HFQRS) in patients with acute myocardial infarction (AMI), including STEMI and NSTEMI, compared to patients without AMI.

Condition or disease
Myocardial Infarction

Detailed Description:

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.

Study Type : Observational
Estimated Enrollment : 50 participants
Observational Model: Case Control
Time Perspective: Prospective
Official Title: Feasibility of High Frequency QRS Analysis in Patients With Acute Myocardial Infarction
Study Start Date : June 2010
Estimated Primary Completion Date : June 2011
Estimated Study Completion Date : June 2011

Resource links provided by the National Library of Medicine

MedlinePlus related topics: Heart Attack

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

Primary Outcome Measures :
  1. 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.

Secondary Outcome Measures :
  1. 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).

Information from the National Library of Medicine

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Ages Eligible for Study:   40 Years and older   (Adult, Older Adult)
Sexes Eligible for Study:   All
Accepts Healthy Volunteers:   No
Sampling Method:   Non-Probability Sample
Study Population
Patients presenting with confirmed AMI in the intensive cardiac care unit (ICCU) of Soroka Medical Center (Beer Sheva, Israel), who are expected to undergo percutaneous coronary intervention (PCI) will be asked to participate in the study. These include both ST-elevation MI (STEMI) and non ST-elevation MI (NSTEMI) patients, with positive biomarkers and clear ongoing electrocardiographic or clinical evidence of ischemia.

Inclusion Criteria:

  • Age > 40 years (men and women)
  • Time from onset of chest pain ≤ 12h
  • AMI confirmed by biomarkers
  • Clinical or electrocardiographic evidence of ischemia during recording
  • Signed an informed consent

Exclusion Criteria:

  • Prior MI
  • Prior CABG
  • pre-excitation syndrome (e.g. WP)
  • Atrial Fibrillation or significant ventricular arrhythmia
  • BBB, intraventricular conduction delay or QRS duration > 120 ms
  • Implanted pacemaker or defibrillator
  • Left-ventricular hypertrophy

Information from the National Library of Medicine

To learn more about this study, you or your doctor may contact the study research staff using the contact information provided by the sponsor.

Please refer to this study by its identifier (NCT number): NCT01150825

Contact: Doron Zahger, MD +972-8-6403468
Contact: Aviva Grosbard +972-8-6400721

Soroka University Medical Center Recruiting
Beer Sheva, Israel, 84101
Sponsors and Collaborators
BSP Biological Signal Processing Ltd.
Principal Investigator: Doron Zahger, MD Soroka University Medical Center

Additional Information:
Publications automatically indexed to this study by Identifier (NCT Number):
Responsible Party: Professor Doron Zahger, Soroka University Medical Center Identifier: NCT01150825     History of Changes
Other Study ID Numbers: ER_02_5023
First Posted: June 25, 2010    Key Record Dates
Last Update Posted: February 8, 2011
Last Verified: February 2011

Keywords provided by BSP Biological Signal Processing Ltd.:
acute ischemia
non-invasive diagnosis
elevated troponin

Additional relevant MeSH terms:
Myocardial Infarction
Pathologic Processes
Myocardial Ischemia
Heart Diseases
Cardiovascular Diseases
Vascular Diseases