Dofetilide unmasks occult congenital long QT syndrome type 2: A simulation study

Lucia Romero, Beatriz Trenor, Jose Maria Ferrero, Javier Saiz, Colleen E Clancy

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


Accurate diagnosis of long QT syndrome is a key factor for reducing the risk of cardiac arrhythmias. Our goal is to investigate the potential use of dofetilide to unmask latent IKr mutation carriers. A modified version of the O'Hara et al. model was used to simulate the electrical activity of isolated cardiac cells. The original IKr formulation was replaced by the Fink et al. Markov model of the human IKr channels and our dynamic model of dofetilide was used to simulate drug administration. A sensitivity analysis was performed to study the effect of IKr transition rate alterations on AP duration (APD) prolongation in the absence and in the presence of dofetilide. Our results show that acceleration of the rate transition from open to the last closed state (ββ) produced the shortest prolongation of the APD in the absence of the drug. However, ββ acceleration provoked the highest additional APD prolongation under dofetilide exposure related to the APD prolongation observed before the drug application. In addition, this IKr alteration was the transition rate modification that most increased the rate of deactivation. In conclusion, our observations indicate that dofetilide could potentially be used to unmask I Kr mutations accelerating the deactivation process.

Original languageEnglish (US)
Title of host publicationComputing in Cardiology
Number of pages4
StatePublished - 2012
Event39th Computing in Cardiology Conference, CinC 2012 - Krakow, Poland
Duration: Sep 9 2012Sep 12 2012


Other39th Computing in Cardiology Conference, CinC 2012

ASJC Scopus subject areas

  • Cardiology and Cardiovascular Medicine
  • Computer Science(all)


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