Original Research: Critical Volume of Human Myocardium Necessary to Maintain Ventricular Fibrillation

My co-authored research article titled – Critical Volume of Human Myocardium Necessary to Maintain Ventricular Fibrillation was published in the peer review journal – Circulation. Arrhythmia and Electrophysiology. The article is available in print, in the December 2018 issue of the journal.

Briefly, the manuscript documents evidence using donor human hearts that ventricular arrhythmias (e.g., ventricular fibrillation) is only sustained if the cardiac tissue volume exceeds the cardiac wavelength volume . The article can be accessed here

Book chapter: conformal electronics therapy for defibrillation


Cardiac Bioelectric Therapy: Mechanisms and Practical Applications

Chapter 38

Conformal Electronics Therapy for Defibrillation


Kedar K. Aras, John A. Rogers, Igor R. Efimov


Defibrillation remains the only effective therapy against sudden cardiac death. However, the current coil-based lead ICD devices are limited by high defibrillation threshold (DFT) and low arrhythmia sensing resolution, which can result in inappropriate and painful shocks adversely affecting the quality of life. Emerging classes of materials and mechanics concepts in the field of flexible and stretchable electronics have created new opportunities for integrating high-performance electronics with the human body and its organs and various tissues. These conformal electronics devices offer a platform for high-definition arrhythmia sensing to minimize inappropriate shocks and improve therapy and high-definition therapy delivery circuit to reduce DFT.

Chromatin Accessibility of human mitral valves and functional assessment of MVP Risk Loci

rs6723013 is a potential causal variant at IGFBP5/TNS1 MVP-associated locus


  1. Mitral valve prolapse (MVP) is a common valvopathy that can lead to heart failure and sudden death. However, the causes of MVP development are still poorly understood.
  2. Functional genomic studies are needed to better characterize MVP associated variants and target genes


  1. We used ATAC-Seq (assay for transposes-accessible chromatin using sequencing) genomic annotation technique in combination with 4C-Seq (circular chromosome conformation capture, coupled to high-throughput sequencing), to describe unprecedented genome-wide chromatin profiles from human pathogenic and non-pathogenic mitral valves.
  2. The experiments also provided evidence for plausible causal variants for rs2641440 at SMG6/SRR locus and rs6723013 at IGFBP2/IGFBP5/TNS1 locus. In addition, we also identified several target genes including SRR, HIC1, and DPH1 at SMG6/SRR locus.


Kyryachenko S, Georges A, Yu M, Berrandou T, Guo L, Bruneval P, Rubio T, Gronwald J, Baraki H, Kutschka I, Aras K, Efimov IR, Norris RA, Voigt N, Bouatia-Naji N. Chromatin Accessibility of Human Mitral Valves and Functional Assessment of MVP Risk Loci. Circ Res. 2021 Jan 28;. doi: 10.1161/CIRCRESAHA.120.317581. [Epub ahead of print] PubMed PMID: 33508947.

Catheter -integrated soft multilayer electronic arrays for multiplexed sensing and actuation during cardiac surgery

Multimodal multiplexed soft sensors and actuators for minimally invasive surgery


  1. Catheters are widely used for minimally invasive therapies such as atrial fibrillation ablation, intravascular stents, etc. In addition, they are also used for capturing information during procedures such as measuring temperature, pressure, electrograms etc.
  2. However, these catheters are limited by mechanical rigidity, low spatial densities, single function capability necessitating use of multiple catheters to acquire critical information.


  1. We have designed a novel flexible, stretchable and tissue conforming electronics device integrated with a balloon catheter that supports simultaneous high-density spatiotemporal mapping of temperature, pressure, and electrograms.
  2. In addition, our device allows for programmable electrical stimulation, radio frequency ablation and irreversible electroporation.
  3. This novel device, the first of its kind, anywhere in the world, will eventually enable physicians to acquire a rich set of physiological information and complete surgeries and deliver therapies in shorter times than currently possible, with a single instrumented catheter system.


Mengdi Han*, Lin Chen*, Kedar Aras*, Cunman Liang, Xuexian Chen, Hangbo Zhao, Kan Li, Ndeye Rokhaya Faye, Bohan Sun, Jae-Hwan Kim, Wubin Bai, Quansan Yang, Yuhang Ma, Wei Lu, Enming Song, Janice Mihyun Baek, Yujin Lee, Clifford Liu, Jeffrey B. Model, Guanjun Yang, Roozbeh Ghaffari, Yonggang Huang, Igor R. Efimov, John A. Rogers. Catheter-integrated soft multilayer electronic arrays for multiplexed sensing and actuation during cardiac surgery. Nature Biomedical Engineering (2020). https://doi.org/10.1038/s41551-020-00604-w.

Scientist, Educator, Entrepreneur