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A Clinical Evaluation of ST Changes in a Group of Patients Having Ventricular Arrhythmias (inSighT)

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: NCT01685047
Recruitment Status : Completed
First Posted : September 13, 2012
Results First Posted : January 25, 2019
Last Update Posted : August 28, 2019
Information provided by (Responsible Party):
Abbott Medical Devices

Brief Summary:
The purpose of this investigation is to determine the prevalence of device-recorded ST segment changes occurring before appropriate Implantable Cardiac Defibrillator (ICD) therapies (ATP or Shock) and to define their temporal relationship to ventricular arrhythmias.

Condition or disease
Coronary Artery Disease

Detailed Description:

Sudden cardiac death due to cardiac arrhythmia is a devastating and unpredictable complication of coronary artery disease.

Implantation of automatic implantable cardioverter defibrillators (ICD) is a well established therapy for the treatment and prevention of sudden cardiac death. Evidence for the use of these devices has been provided by a number of landmark clinical trials over the last 16 years.

Reduction in ischemia can be achieved by coronary artery revascularization but in many patients may occur a gradual progression to recurrence of ischemia resulting in further life threatening arrhythmias. It is reasonable to assume that unchecked progression of ischemic heart disease may result in increased mortality in ICD patients. It has been shown that the long term mortality risk for ICD patients can be linked to the time since the last coronary revascularization procedure. Both MADIT-II and Sudden Cardiac Death in Heart Failure trial (SCD-HeFT) showed that patients receiving inappropriate ICD therapy have an increased risk of death. It has been speculated that this may be due to progression of the disease and recurrent ischemia.

A feature available in some ICDs manufactured by St Jude medical enables the constant beat to beat monitoring of the intra-cardiac ST segment using the implanted ICD leads. Similar systems have demonstrated this approach to be a reliable method of identifying ischemic events. However, the predictive value of the ST monitoring feature in identifying pending arrhythmic events has yet to be established. Prediction of worsening ischemia could play an important part in allowing physicians to identify ICD patients with greater mortality risk and allow them the time to personalize patient therapy in order to reduce that risk.

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Study Type : Observational
Actual Enrollment : 481 participants
Observational Model: Cohort
Time Perspective: Prospective
Official Title: A Clinical Evaluation of ST Changes in a Group of Patients Having Ventricular Arrhythmias
Study Start Date : December 2012
Actual Primary Completion Date : January 2016
Actual Study Completion Date : April 2016

Primary Outcome Measures :
  1. Among Patients With an Appropriate ICD Therapy (Shock or ATP) for Ventricular Tachycardia or Fibrillation, the Number of Patients Who Have Characterized ST Segment Changes From Baseline Prior to the Therapy Was Calculated. [ Time Frame: Until the end of follow up period ]

Information from the National Library of Medicine

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Ages Eligible for Study:   18 Years and older   (Adult, Older Adult)
Sexes Eligible for Study:   All
Accepts Healthy Volunteers:   No
Sampling Method:   Non-Probability Sample
Study Population
Patient is implanted with SJM ICD and has or is at high risk of CAD

Inclusion Criteria:

  • The patient is implanted with an St Jude Medical (SJM) ICD with ST Monitoring and ShockGuard™ features (and remote care feature in case will be used)
  • The patient, in the opinion of the investigator, will not require ventricular pacing for more than 20% of the time.
  • The patient, in the opinion of the investigator, has or is at high risk of Coronary Artery Disease (CAD).
  • The patient is ≥ 18 years of age.
  • The patient is able to provide written Informed Consent prior to any investigational related procedure.

Exclusion Criteria:

  • The patient has longstanding persistent Atrial Fibrillation (AF) /Atrial Flutter (AFl) or permanent AF/AFl
  • The patient has documented complete heart block.
  • The patient is known to have uncontrolled ventricular bigeminy or trigeminy (PVCs on regular basis).
  • The patient has severe Left Ventricular Hypertrophy resulting in interventricular conduction defect (IVCD).
  • The patient has intermittent bundle branch blocks (BBB).
  • The patient is unable to comply with the follow up schedule.
  • The patient is participating in another investigational device or drug investigation.
  • The patient is pregnant or is planning to become pregnant during the duration of the investigation.

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): NCT01685047

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Kerckhoff Klinik
Bad Nauheim, Germany, D-61231
Sponsors and Collaborators
Abbott Medical Devices
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Principal Investigator: Johannes SPERZEL, MD Kerckhoff Klinik, Bad Nauheim Germany

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Responsible Party: Abbott Medical Devices Identifier: NCT01685047    
Other Study ID Numbers: CR-12-014-ID-HV
First Posted: September 13, 2012    Key Record Dates
Results First Posted: January 25, 2019
Last Update Posted: August 28, 2019
Last Verified: July 2019
Individual Participant Data (IPD) Sharing Statement:
Plan to Share IPD: Undecided
Keywords provided by Abbott Medical Devices:
Coronary Artery Disease
Ventricular Arrhythmias
ST Segment Changes
Additional relevant MeSH terms:
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Coronary Artery Disease
Myocardial Ischemia
Coronary Disease
Heart Diseases
Cardiovascular Diseases
Arterial Occlusive Diseases
Vascular Diseases