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DISCOVERY: Diagnostic Data and Genetic Polymorphisms in ICD Patients. (DISCOVERY)

This study has been completed.
Information provided by (Responsible Party):
Medtronic Bakken Research Center Identifier:
First received: May 23, 2007
Last updated: March 4, 2013
Last verified: March 2013

To prospectively evaluate if the analysis of genetic polymorphisms can be used to identify patients at risk of ventricular tachycardia.

To evaluate the influence of ICD-based diagnostic information on the long term treatment and management of primary prevention ICD-patients.

Condition Intervention Phase
Death, Sudden, Cardiac
Ventricular Fibrillation
Atrial Fibrillation
Sick Sinus Syndrome
Device: Defibrillator, Dual Chamber ; Implantable
Procedure: Blood sampling
Phase 4

Study Type: Interventional
Study Design: Intervention Model: Single Group Assignment
Masking: Double Blind (Participant, Care Provider, Investigator)
Primary Purpose: Diagnostic
Official Title: Diagnostic Data Influence on Disease Management and Relation of Genetic Polymorphisms to Tachy-arrhythmia in ICD Patients.

Resource links provided by NLM:

Further study details as provided by Medtronic Bakken Research Center:

Primary Outcome Measures:
  • Positive predictive value of single nucleotide polymorphisms (SNPs) in the genes GNB3, GNAS and GNAQ as predictors of ventricular arrhythmia <400 msec. [ Time Frame: 2 years ]

Secondary Outcome Measures:
  • Hospitalization, medical interventions, medication, surgery, additional diagnostics [ Time Frame: 2 years ]
  • All Cause Mortality, Cardiac death and atrial fibrillation/flutter [ Time Frame: 2 years ]

Enrollment: 1223
Study Start Date: February 2007
Study Completion Date: December 2012
Primary Completion Date: July 2012 (Final data collection date for primary outcome measure)
Arms Assigned Interventions
Experimental: ICD Therapy, blood sampling
Blood sampling Defibrillator, Dual Chamber ; Implantable
Device: Defibrillator, Dual Chamber ; Implantable
Patient must wear a dual chamber ICD to remain in study. Can be enrolled 10 days prior to implant. Is excluded if device type changes.
Procedure: Blood sampling
Blood sampling

Detailed Description:

Evaluate the positive predictive value of single nucleotide polymorphisms (SNPs) in the genes GNB3, GNAS and GNAQ as predictors of ventricular arrhythmia <400 msec.

  1. Evaluate the positive predictive value of Single Nucleotide Polymorphisms as predictor for death, cardiac death and atrial fibrillation/flutter in the genes GNB3, GNAS, GNAQ and other SNPs involving signal transduction components which impact on the activity of cardiac ion channels.
  2. Evaluate the best combination of genetic parameters, baseline data and follow-up data as predictor of primary endpoint, All cause Mortality, cardiac death and atrial arrhythmia.
  3. Evaluate the usage of ICD-system diagnostics (battery status, impedance, pacing threshold, sensing) resulting in medical consequences*.
  4. Evaluate the usage of ICD-based patient diagnostics (arrhythmia, IEGM, heart frequency, %pacing, Cardiac Compass) resulting in medical consequences*.
  5. Evaluate the frequency of programming changes involving AF-prevention and AF-therapy algorithms.
  6. Evaluate the frequency of pacing-parameter programming changes and the resulting medical consequences*.

    • Medical consequences include: Hospitalization, medical interventions, medication, surgery, additional diagnostics and ICD-programming changes.

Ages Eligible for Study:   18 Years and older   (Adult, Senior)
Sexes Eligible for Study:   All
Accepts Healthy Volunteers:   No

Inclusion Criteria:

  • Implantation of a market approved Medtronic Dual-chamber ICD with long term clinical trends Cardiac Compass,
  • Subjects requiring the implantation of an ICD for primary prevention according to the current AHA/ACC/ESC guidelines,
  • Subject able to comply with the Clinical InvestigationPlan,
  • Subject is expected to remain available for follow-up visits,
  • Subject has signed the informed consent form within 10 days of implant,
  • The system implanted for this study is the first ICD implant for patient.

Exclusion Criteria:

  • Women who are pregnant, or women of childbearing potential not on a reliable form of birth control,
  • Subject is enrolled in a concurrent study that may confound the results of this study,
  • Subject has a life expectancy less than two years,
  • Subject is post heart transplant or awaiting heart transplantation,
  • Subject is anticipated to demonstrate poor compliance,
  • Subjects with syndromes known to be associated with ion channel pathologies such as:

    • Long- or short-QT Syndrome
    • Brugada Syndrome
    • Catecholaminergic Polymorphic Ventricular Tachycardia (CPTV ).
  Contacts and Locations
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Please refer to this study by its identifier: NCT00478933

Sponsors and Collaborators
Medtronic Bakken Research Center
Principal Investigator: Domenico Corrado, MD University of Padova, Italy
Principal Investigator: Heiner Wieneke, MD Universitätsklinikum Essen, Germany
  More Information

Publications automatically indexed to this study by Identifier (NCT Number):
Responsible Party: Medtronic Bakken Research Center Identifier: NCT00478933     History of Changes
Other Study ID Numbers: DISCOVERY
Study First Received: May 23, 2007
Last Updated: March 4, 2013

Keywords provided by Medtronic Bakken Research Center:

Additional relevant MeSH terms:
Atrial Fibrillation
Death, Sudden
Sick Sinus Syndrome
Death, Sudden, Cardiac
Ventricular Fibrillation
Arrhythmias, Cardiac
Heart Diseases
Cardiovascular Diseases
Pathologic Processes
Arrhythmia, Sinus
Heart Block
Heart Arrest processed this record on May 25, 2017