Try our beta test site

QT Interval in Patients With Pacemaker Dependency (QT-TENDENCY)

This study has been completed.
Information provided by (Responsible Party):
Dr. Samir Said, University of Magdeburg Identifier:
First received: September 24, 2012
Last updated: October 27, 2016
Last verified: October 2016
The aim of this study is to examine a correction term for an adapted QT interval during ventricular pacing (right, left and biventricular pacing) to obtain valid formulae correcting for the QT intervals in various pacing conditions.

High Degree AV-block
Left Bundle Branch Block

Study Type: Observational
Study Design: Observational Model: Cohort
Time Perspective: Prospective
Official Title: Corrected QT Interval in Patients With Pacemaker Dependency (QT-TENDENCY-Study)

Resource links provided by NLM:

Further study details as provided by University of Magdeburg:

Primary Outcome Measures:
  • Corrected QT Interval in Patients With Pacemaker Dependency [ Time Frame: baseline ]

Biospecimen Retention:   None Retained
No biospecimen are necessary for the study and this issue is irrelevant.

Estimated Enrollment: 180
Study Start Date: March 2012
Study Completion Date: April 2016
Primary Completion Date: April 2015 (Final data collection date for primary outcome measure)
Pacemaker mode programming
High grade AV-block

Detailed Description:
This investigation aims at determining a possibility to assess the usefulness of various formulae that correct for the different effects of various pacing modes on the QT interval. More specifically, the hypothesis will be tested that applying adequate correction will preserve the predictive power of the QT-interval regarding proarrhythmia in various cardiac pathologies and therapies.

Ages Eligible for Study:   18 Years to 75 Years   (Adult, Senior)
Sexes Eligible for Study:   All
Accepts Healthy Volunteers:   No
Sampling Method:   Non-Probability Sample
Study Population
The study will enroll 180 patients after an implantation of cardioverter/defibrillator or pacemaker based on a standard guideline indication. The point of enrolment for all patients is the time at which the patient signs and dates the ICF during the hospital stay in the context of implantation.

Inclusion Criteria:

  • caucasian race
  • implanted cardioverter/defibrillator or pacemaker
  • negative pregnancy test for women of child bearing potential
  • stable function of the implanted device
  • stable medical therapy relating to the underlying disease
  • stable medical therapy of antiarrhythmic drugs and other QT-time changing drugs
  • no instability of rhythm
  • x-ray of thorax during device implantation in two levels (ap and ll axis)
  • written informed consent

Exclusion Criteria:

  • coronary heart disease and angina pectoris symptoms
  • patient with acute myocardial infarction or CABG while the last 4 weeks
  • patient with tachycardia and a rest frequency >80 bpm
  • patient with severe pulmonary disease
  • patient with anaemia
  • patient with acute infections
  • patient with severe kidney or liver disease
  Contacts and Locations
Choosing to participate in a study is an important personal decision. Talk with your doctor and family members or friends about deciding to join a study. To learn more about this study, you or your doctor may contact the study research staff using the Contacts provided below. For general information, see Learn About Clinical Studies.

Please refer to this study by its identifier: NCT01694550

Magdeburg University, Internal Medicine/Cardiology, Angiology and Pneumologie
Magdeburg, Germany, 39120
Sponsors and Collaborators
University of Magdeburg
Principal Investigator: Samir Said, Dr. Magdeburg University
  More Information

Responsible Party: Dr. Samir Said, Dr. med., University of Magdeburg Identifier: NCT01694550     History of Changes
Other Study ID Numbers: OVGU-Kar-011
Study First Received: September 24, 2012
Last Updated: October 27, 2016

Keywords provided by University of Magdeburg:
corrected QT-interval

Additional relevant MeSH terms:
Bundle-Branch Block
Heart Block
Arrhythmias, Cardiac
Heart Diseases
Cardiovascular Diseases
Pathologic Processes processed this record on March 28, 2017