What does this research mean for the field?

Patient-specific CPVT-hiPSC-derived cardiomyocytes exhibit delayed afterdepolarizations in 69% of cells compared with 11% in healthy controls, recapitulating key disease features under adrenergic stimulation. Novelty: ClaimNovelty.METHODOLOGICAL. Consensus alignment: ConsensusAlignment.NEUTRAL.

September 21, 2026Journal of the American College of CardiologyOpen Access

Modeling of Catecholaminergic Polymorphic Ventricular Tachycardia With Patient-Specific Human-Induced Pluripotent Stem Cells

Q: What is the clinical evidence from this study?

Study design: Other. Population: Catecholaminergic polymorphic ventricular tachycardia (CPVT) (n=1). Intervention: Patient-specific CPVT-hiPSCs-derived cardiomyocytes vs. Healthy control hiPSCs-derived cardiomyocytes. Primary outcome: Development of delayed afterdepolarizations.

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Key result

Patient-specific CPVT-hiPSC-derived cardiomyocytes exhibit ~6x more delayed afterdepolarizations than healthy controls.

Authors

IIIlanit ItzhakiChildren's Healthcare of Atlanta LMLeonid MaizelsThe Royal Melbourne Hospital IHIrit HuberRappaport Family Institute for Research in the Medical Sciences

Discussion

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Implication

Experimental stem cell study demonstrates arrhythmogenic calcium handling in patient-derived cardiomyocytes, highlighting therapeutic targets for catecholaminergic polymorphic ventricular tachycardia.

Key Points

To develop a patient-specific human-induced pluripotent stem cell model of catecholaminergic polymorphic ventricular tachycardia to investigate cellular disease mechanisms and pharmacological responses.
Reprogrammed dermal fibroblasts from a patient harboring an RYR2 M4109R heterozygous point mutation to generate patient-specific human-induced pluripotent stem cells.
Differentiated patient and healthy control stem cells into cardiomyocytes for comparative functional analysis.
Evaluated intracellular electrophysiology and calcium dynamics using patch recordings and laser-confocal imaging under adrenergic stimulation and pharmacological blockade.
Delayed afterdepolarizations developed in 69% of patient-derived cardiomyocytes compared with 11% of healthy control cardiomyocytes.
Adrenergic stimulation with isoproterenol (1 μM) or forskolin (5 μM) escalated afterdepolarization frequency, magnitude, and triggered activity, whereas flecainide (10 μM) and thapsigargin (10 μM) abolished all afterdepolarizations.
Confocal imaging identified irregular calcium transients and a significantly reduced threshold for store-overload-induced calcium release in diseased cardiomyocytes, which improved following beta-blocker treatment.

PICO

Population

Patient-specific human-induced pluripotent stem cells derived from a single CPVT patient with an M4109R heterozygous point RYR2 mutation, compared to healthy control cardiomyocytes.

Exposure / Comparator

Patient-specific CPVT-hiPSCs-derived cardiomyocytes vs Healthy control hiPSCs-derived cardiomyocytes

Primary Outcome

Development of delayed afterdepolarizations

Main Result

Absolute Event Rate: 69% vs 11%

Cite This Study

Itzhaki et al. (2012) studied Catecholaminergic polymorphic ventricular tachycardia (CPVT) (n=1). Patient-specific CPVT-hiPSCs-derived cardiomyocytes vs. Healthy control hiPSCs-derived cardiomyocytes was evaluated on Development of delayed afterdepolarizations. Patient-specific CPVT-hiPSCs-derived cardiomyocytes exhibited delayed afterdepolarizations in 69% of cells compared with 11% in healthy control cardiomyocytes.

synapsesocial.com/papers/6ab0f5d8a27b87cbace462a7 https://doi.org/10.1016/j.jacc.2012.02.066

Topics

Ventricular arrhythmias

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Modeling of Catecholaminergic Polymorphic Ventricular Tachycardia With Patient-Specific Human-Induced Pluripotent Stem Cells

Discussion

Member takes

Implication

Key Points

PICO

Main Result

Cite This Study

Topics

Modeling of Catecholaminergic Polymorphic Ventricular Tachycardia With Patient-Specific Human-Induced Pluripotent Stem Cells

Discussion

Member takes

Implication

Key Points

PICO

Main Result

Cite This Study

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