Impedance Service

Ncardia’s Impedance Service offers a real-time, label-free measurement of cardiotoxicity using human iPSC-derived cardiomyocytes. In addition to detecting acute drug effects, this assay is recommended for revealing chronic cytotoxicity .

This service is based on impedance monitoring of hiPSC-derived cardiomyocytes after compound treatment which is followed by a thorough analysis by our in-house experts. Parameters analyzed comprise cardiomyocyte beat rate, impedance amplitude and beat rate regularity. In addition, the Cell Index (CI) is a reliable surrogate marker for cell viability. For this assay, the human iPSC-derived cardioymocytes are cultured in 48 or 96 well assay plates and can be recorded by a variety of our in-house platforms including the xCELLigence RTCA CardioECR, xCELLigence Cardio, CardioExcyte 96, and ECIS.



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Case study: Determining acute and long-term effects of anti-cancer drugs by impedance.


Many novel oncology therapeutics may induce cardiotoxicity by inhibiting survival pathways which are shared by both tumors and cardiac cells. As complex mechanisms underlie drug-induced toxicity, some compound effects will only become evident after longer incubation times. Impedance monitoring of hiPSC-derived cardiomyocytes enables a longer-time measurement of potential cardiotoxic drug effects in vitro.

Case study specifications

Cell type

Pluricyte® Cardiomyocytes


48 wells
Technology xCelligence CardioECR (ACEA)

Assay window

Acute (30 min) till long-term (64h) effect

Assay controls

0.1% DMSO (vehicle control)

Test compounds

nilotinib, lapatinib, doxorubicin, and ponatinib

Compound concentrations

10 µM, 3 µM, 0.3 µM


IBD10 (beat duration defined as the width at 10% of the CI amplitude)

CI amplitude

Beat rate



The effects of 3 µM lapatinib, 3 µM nilotinib, 0.1 µM nitrendipine and 0.3 µM doxorubicin on the IBD10, CI amplitude and beat rate of Pluricyte® Cardiomyocytes were quantified at 30min., 24hr. and 64hr. post-addition. Data are shown as percentage change from baseline and are corrected for the negative control, 0.1% DMSO. Whereas addition of Nilotinib and Nitrendipine showed acute effects after compound addition, Lapatinib and Doxorubicin only exhibited a long-term toxic effect.



Impedance measurements allows for a simultaneous assessment of short-term and long-term drug-induced cardiotoxicity from a single well, leading to better prediction of drug-induced cardiotoxicity.