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Characterization of Ischemia Related Changes in Esophageal Electrocardiography

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ClinicalTrials.gov Identifier: NCT01390155
Recruitment Status : Completed
First Posted : July 8, 2011
Last Update Posted : May 24, 2013
Sponsor:
Information provided by:
University Hospital Inselspital, Berne

Brief Summary:

Esophageal electrocardiography (eECG) has important advantages compared to standard ECG recordings.

Coronary artery disease leading to myocardial ischemia is very common and has potentially severe consequences for patients. To date, the investigators don't know the influence of ischemia on the eECG. The goal of the present study is to assess ischemic changes of the eECG induced by balloon occlusion of coronary arteries in patients undergoing coronary angiography.


Condition or disease Intervention/treatment
Coronary Artery Disease Procedure: Measurement of coronary collateral flow index

  Show Detailed Description

Study Type : Observational
Actual Enrollment : 45 participants
Time Perspective: Prospective
Official Title: Characterization of Ischemia Related Changes in Esophageal Electrocardiography
Study Start Date : July 2011
Primary Completion Date : May 2013
Study Completion Date : May 2013

Resource links provided by the National Library of Medicine

U.S. FDA Resources

Group/Cohort Intervention/treatment
1
Patients undergoing temporary myocardial ischemia produced by a one-minute balloon occlusion of the proximal left anterior descending coronary artery.
Procedure: Measurement of coronary collateral flow index
One-minute balloon occlusion of the proximal left anterior descending coronary artery inducing a controlled short-time ischemic condition of a part of the myocardium and simultaneous evaluation of collateral flow.
2
Patients undergoing temporary myocardial ischemia produced by a one-minute balloon occlusion of the proximal left circumflex artery.
Procedure: Measurement of coronary collateral flow index
One-minute balloon occlusion of the proximal left circumflex artery inducing a controlled short-time ischemic condition of a part of the myocardium and simultaneous evaluation of collateral flow.
3
Patients undergoing temporary myocardial ischemia produced by a one-minute occlusion of the proximal right coronary artery.
Procedure: Measurement of coronary collateral flow index
One-minute balloon occlusion of the proximal right coronary artery inducing a controlled short-time ischemic condition of a part of the myocardium and simultaneous evaluation of collateral flow.
4
Patients undergoing temporary myocardial ischemia produced by a one-minute occlusion of the target vessel.
Procedure: Measurement of coronary collateral flow index
One-minute balloon occlusion of the target vessel (the vessel which shows a significant stenosis and accordingly requires a therapeutical intervention by balloon angioplasty and stenting) inducing a controlled short-time ischemic condition of a part of the myocardium and simultaneous evaluation of collateral flow.



Primary Outcome Measures :
  1. ST-segment-elevation/depression in the ECG at J-point and 80ms later [ Time Frame: 0, 10, 20, 30, 40, 50, 60, 70, 80, 90, 100, 110 and 120 seconds after start of vessel occlusion ]

Secondary Outcome Measures :
  1. Increase/decrease of T-wave amplitude [ Time Frame: 0, 10, 20, 30, 40, 50, 60, 70, 80, 90, 100, 110 and 120 seconds after start of vessel occlusion ]
  2. Relative ST-segment-elevation/depression [ Time Frame: 0, 10, 20, 30, 40, 50, 60, 70, 80, 90, 100, 110 and 120 seconds after start of vessel occlusion ]
  3. Sensitivity and specificity of the esophageal electrocardiogram detecting ischemic conditions (using the intracoronary ecg as gold standard) [ Time Frame: at the end of occlusion, expected on average to be 60 seconds ]
  4. New U-wave [ Time Frame: during the whole occlusion time, expected on average to be 60 seconds ]
  5. beat-to-beat alternans of the ST-segment [ Time Frame: during the whole occlusion time, expected on average to be 60 seconds ]


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Ages Eligible for Study:   18 Years and older   (Adult, Senior)
Sexes Eligible for Study:   All
Accepts Healthy Volunteers:   No
Sampling Method:   Probability Sample
Study Population
Patients referred for elective coronary angiography due to suspected or known coronary artery disease.
Criteria

Inclusion Criteria:

  • Patients referred for elective coronary angiography
  • Age >/= 18 years
  • Written informed consent to participate to this study

Exclusion Criteria

  • Seve mitral- or aortic valve disease
  • Acute coronary infarction
  • Known bleeding diathesis
  • Systolic blood pressure >200mmHg
  • History of operations of the esophagus
  • Active disease of the upper respiratory and gastroesophageal tract
  • Radiofrequency ablation of atrial fibrillation, less than six weeks ago
  • Right and left bundle branch block
  • Significant Q-waves in the surface leads as indicators for prior myocardial infarction
  • Pregnancy

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 ClinicalTrials.gov identifier (NCT number): NCT01390155


Locations
Switzerland
Dep. of Cardiology, Bern University Hospital
Bern, Switzerland, 3010 Bern
Sponsors and Collaborators
University Hospital Inselspital, Berne
Investigators
Study Director: Rolf Vogel, MD, MD-PhD

Responsible Party: Vogel Rolf, Prof. Dr. med., University Hospital Bern
ClinicalTrials.gov Identifier: NCT01390155     History of Changes
Other Study ID Numbers: 058/11
First Posted: July 8, 2011    Key Record Dates
Last Update Posted: May 24, 2013
Last Verified: May 2013

Keywords provided by University Hospital Inselspital, Berne:
Electrocardiography
Coronary Artery Disease
Atrial Fibrillation
Heart Atria
Coronary Circulation
Ischemia

Additional relevant MeSH terms:
Coronary Artery Disease
Myocardial Ischemia
Coronary Disease
Ischemia
Heart Diseases
Cardiovascular Diseases
Arteriosclerosis
Arterial Occlusive Diseases
Vascular Diseases
Pathologic Processes