Repolarization lability measured by spatial TT' angle

Larisa G. Tereshchenko

Research output: Chapter in Book/Report/Conference proceedingConference contribution

4 Scopus citations


Aims: Increased T peaks cloud volume is associated with increased risk of ventricular arrhythmias (VA) in cardiomyopathy (CM) patients. T peaks cloud volume is formed, as a result, of (1) the angle between consecutive T-vectors and (2) temporal variability in T-vector amplitude. This study compares association of these two factors with VA. Methods: Baseline orthogonal ECGs were recorded during 5 min at rest in 414 patients with structural heart disease [mean age 59.4±12.0; 68% whites; 73% men; 45% non-ischemic CM] before implantation of implantable cardioverter-defibrillator (ICD) for primary prevention of sudden cardiac death. The spatial TT' angle between consecutive spatial T vectors was calculated using the definition of the inner product. Results: During a median 14 months of follow-up, 61 patients experienced sustained VA with appropriate ICD therapies. In a multivariable Cox regression model after adjustment for age, sex, race, spatial TT' angle was associated with VA (HR 1.03; 95%CI 1.0-1.05; P=0.034). Interaction with CM type was found: TT' angle was strongly associated with polymorphic VT/VF in non-ischemic CM (HR 1.04; 95%CI 1.0-1.05; P=0.033). Conclusion: Increased spatial TT' angle is associated with increased risk of VA.

Original languageEnglish (US)
Title of host publicationComputing in Cardiology
PublisherIEEE Computer Society
Number of pages4
StatePublished - 2014
Event41st Computing in Cardiology Conference, CinC 2014 - Cambridge, United States
Duration: Sep 7 2014Sep 10 2014


Other41st Computing in Cardiology Conference, CinC 2014
Country/TerritoryUnited States

ASJC Scopus subject areas

  • Cardiology and Cardiovascular Medicine
  • Computer Science(all)


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