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Quantification of the ionic current contributions to alterations in the action potential repolarization by means of piecewise-linear approximation

Research output: Chapter in Book/Report/Conference proceedingConference contributionScientificpeer-review


Original languageEnglish
Title of host publication2015 Computing in Cardiology Conference (CinC)
Number of pages4
ISBN (Print)9781509006854
Publication statusPublished - 16 Feb 2016
Publication typeA4 Article in a conference publication
EventComputing in cardiology conference -
Duration: 1 Jan 1900 → …

Publication series

ISSN (Electronic)2325-887X


ConferenceComputing in cardiology conference
Period1/01/00 → …


At cellular level, changes in the cardiac action potential (AP) duration (APD) are relevant proarrhythmic markers. The assessment of single current contributions to APD changes allows the investigation of the complex interplay of ionic mechanisms underlying such repolarization changes. In this paper, we present a new method to quantify the contributions of each membrane current to AP D changes due to a perturbation from the basal to a different condition. To achieve our goal, we used a piecewiselinear approximation of the AP. We tested our method on the OHara-Rudy model in case of rate adaptation: from the basal condition (pacing at 60 bpm), two different pacing rates are used as perturbations: 30 bpm, which prolongs APD by 21 ms, and 120 bpm, which shortens APD by -37 ms. At steady state, the most significant current contributions (30 bpm/120 bpm) are: INaK (68/-73 ms), ICaL (-58/51 ms), INaCa (-10/25 ms), IKs (13/-7 ms) and INaL (7/-23 ms). Our method allows also quantifying the dynamic adaptation to rate changes from the perturbation until the steady state. In conclusion, our method enables the quantification of the adaptive and compensatory mechanisms implemented by the (in silico model of) cell in response to a perturbation, such as the pacing rate change.

Publication forum classification

Field of science, Statistics Finland