Summer 2022

Paper published in Frontiers in Immunology

Ultrasound Neuromodulation of the Spleen Has Time-Dependent Anti-Inflammatory Effect in a Pneumonia Model

Umair Ahmed, and colleagues demonstrate that activation of the cholinergic anti-inflammatory pathway with spleen focused ultrasound (FUS) has time-dependent effect on serum cytokines in a model of pneumonia: cytokine suppression is absent at intermediate times post-infection (16 hours following inoculation), but present during the early (4 hours) and later phases (48 hours), as well as in healthy animals. The time-dependent effect could be used as a diagnostic test, even in the absence of clinical manifestations of pneumonia.

Journal link

Author copy

Spring 2022

Review paper published in Bioelectronic Medicine

Strategies for precision vagus neuromodulation

Umair Ahmed, Yao-Chuan Chang and colleagues provide a detailed overview of strategies for precision neuromodulation of the vagus, including its anatomical basis, relevant technologies and translational applications in neurologic, cardiovascular and gastrointestinal diseases.

Journal link

Author copy

Spring 2022

Talks at MN Neuromodulation Symposium & DMD Conference

Vagus neuromodulation

Stavros Zanos is giving 2 talks related to vagus nerve stimulation:

  1. Anatomical basis for selective cervical vagus nerve stimulation

Design of Medical Devices Conference 2022, April 13, 2022

Session: Neurorobotics & Neuromodulation

  1. Precision Vagus Neuromodulation

MN Neuromodulation Symposium 2022, Thursday April 14, 2022

Session: Closing the Loop

Spring 2022

Paper published in Nature Biomedical Engineering

Stimulation of the hepatoportal nerve plexus with focused ultrasound restores glucose homoeostasis in diabetic mice, rats and swine

Several members of the TNP lab, including Weiguo Song, Khaled Qanud, Jackie Tomaio and Stavros Zanos, were part of a team of investigators led by Chris Puleo (General Electric Research) that showed that noninvasive ultrasound neuromodulation of the sensory innervation of the liver results in improvement of the glycemic control in animal models of diabetes.

Journal link

Author copy

Winter 2021-2022

Paper published in Journal of the American College of Cardiology

Autonomic Neuromodulation for Atrial Fibrillation Following Cardiac Surgery

Stefanos Zafeiropoulos, graduate student at the lab and scholar at the Elmezzi School of Molecular Medicine at Feinstein, provides a summary and critical appraisal of the clinical evidence behind the use of autonomic neuromodulation for preventing post-operative atrial fibrillation, a common arrhythmia after cardiac surgery.

Journal link

Author copy

Podcast discussion by Valentin Fuster, JACC Senior Editor

Coverage by MedScape Cardiology

Coverage by This Week in Cardiology Podcast

Coverage by BioSpace

Summer 2021

Lab presentations at Neural Interfaces 2021 NANS-NIC Joint Meeting

Members of the TNP lab present 3 posters and moderate 1 concurrent session:

  1. Yao-Chuan Chang et al: KHz-frequency stimuli for selective activation of vagal C-fibers in rats and mice

  2. Ibrahim Mughrabi et al: Real-time voltammetric detection of VNS-elicited norepinephrine release in the mouse spleen

  3. Umair Ahmed et al: Threshold intensities for VNS depend on implant- and anesthesia-related factors

  4. Bioelectronic medicine: New frontiers in vagus nerve stimulation and ultrasound therapy; concurrent session moderated by Chris Puleo & Stavros Zanos, with presentations by Cristin Welle, Nikki Pelot, Sangeeta Chavan, Hubert Lim

Summer 2021

Paper published in Cerebral Cortex

Cortical Responses to Vagus Nerve Stimulation Are Modulated by Brain State in Nonhuman Primates

Irene Rembado, former post-doc at University of Washington and currently a scientist at the Allen Brain Institute, and Weiguo Song, scientist at the TNP lab, documented how the state of the brain during different wakefulness and sleep stages shapes the cortical responses to vagus nerve stimulation in nonhuman primates.

Open-access paper

Coverage by Psychology Today

Coverage by Genetic Engineering & Biotechnology News

Summer 2021

Paper published in Journal of Neural Engineering

Implant- and anesthesia-related factors affecting cardiopulmonary threshold intensities for vagus nerve stimulation

Umair Ahmed, post-doc at the TNP lab, examined how implant age and wakefulness/anesthesia affect neurological and cardiopulmonary threshold intensities of vagus nerve stimulation in a rodent model.

Open-access paper

Coverage by BusinessWire

Spring 2021

Lab poster at American College of Cardiology Scientific Sessions

Umair Ahmed, post-doc at the TNP lab, discusses how focused ultrasound (FUS) neuromodulation of the inflammatory reflex at the spleen reduces the severity of pulmonary arterial hypertension in the Sugen-hypoxia rat model.


Spring 2021

Electricity in Physiology & Medicine

A brief account by Dr. David M. Warmflash on how the physics of electromagnetism started merging with physiology and medicine through a scientific and philosophical rivalry b/w two Italian giants: Galvani and Volta.

Medscape article

PDF copy

Spring 2021

OpEd: On the cusp of bioelectronic medicine breakthroughs

Stavros Zanos provides a short overview of preclinical and clinical research from the past year on the use of bioelectronic medicine to treat chronic diseases.

HealthTechHotSpot article

PDF copy

Spring 2021

Lab presentations at IEEE EMBC Neural Engineering Conference

The TNP lab presents 1 full paper and 1 plenary talk at IEEE-EMBC NER 2021.

  1. Laryngeal Electromyography to Estimate A-Fiber Engagement by Vagal Stimuli in Mice

  • Full paper, part of "Bioelectronic Medicine" session

  • Ibrahim Mughrabi and Adam Abbas present a method for recording laryngeal EMG in mice and its use in estimating A-fiber engagement by VNS.

  • Schedule

  1. Targeting of fiber subpopulations in cervical #VNS based therapies

  • Plenary talk, part of "Microelectodes for Small Nerves and Plexi" minisymposium

  • Yao-Chuan Chang and Stavros Zanos discuss ways to target selectively subpopulations of vagal fibers in the context of cervical VNS.

  • Schedule

Spring 2021

Paper published in eLife

Development and characterization of a chronic implant mouse model for vagus nerve stimulation

Ibrahim Mughrabi, post-doc at the TNP lab, and Jordan Hickman, research associate at Cristin Welle's lab at the University of Colorado, co-authored a paper in which they describe the surgical method for and the physiological, functional and histological characterization of a chronic mouse implant for stimulating the vagus nerve.

Open-access paper

Coverage by Technology Networks

Fall 2020

Paper published in Brain Stimulation

Quantitative estimation of nerve fiber engagement by vagus nerve stimulation using physiological markers

Yao-Chuan Chang, post-doc at the TNP lab, and Marina Cracchiolo, student at Silvestro Micera's lab in Scuola Superiore Sant'Anna and rotation student with Theo Zanos, co-authored a paper in which they estimated vagal fiber engagement by vagus nerve stimulation trains by looking at acute physiological responses that can be registered noninvasively.

Open-access paper

Coverage by Psychology Today

Fall 2020

Lab presentations at 4th Bioelectronic Medicine Summit

The TNP lab presents 3 posters and 1 plenary talk at the BEM Summit.

  1. Factors affecting stimulation threshold in cervical VNS in rodents

  • Poster

  • Umair Ahmed et al. explain how several implant- and physiology-related factors affect the thresholds for VNS eliciting compound action potentials and physiological responses in rats.

  1. Real-time detection of VNS-elicited NE release in the mouse spleen

  • Poster

  • Naveen Jayaprakash, Ibrahim Mughrabi et al. describe a method for detecting release of norepinephrine in the mouse spleen elicited by VNS. NE release in the spleen is a critical step in the anti-inflammatory actions of VNS.

  1. Ultrasound neuromodulation of the porta hepatis affects insulin sensitivity in swine

  • Poster

  • Khaled Qanud et al. discuss how targeted U/S neuromodulation of the porta hepatis of the liver affects insulin sensitivity in swine, with implications in the noninvasive bioelectronic treatment of metabolic disorders such as diabetes.

  1. Targeting populations of fibers in clinically-relevant VNS

  • Talk, September 23, Session 2 "Bioelectronic devices in preclinical research", 10:40-12:15

  • Stavros Zanos discusses clinical reasons for targeted vagal neuromodulation, methods to quantify it, and strategies for accomplishing it.

Poster abstracts from Bioelectronic Medicine journal

Summer 2020

Talk at Neuroprosthetics Summer School 2020

Methods and translational applications of selective vagus nerve stimulation

Stavros Zanos discusses methods and applications of stimulating the vagus nerve to engage specific functions (afferent vs. efferent), fiber types (A, B or C), fascicles and physiological states (closed-loop stimulation).


Summer 2020

Preprint on BioRxiv

An implant for long-term cervical vagus nerve stimulation in mice

Ibrahim Mughrabi, post-doc at the TNP lab, and Jordan Hickman, from the BIOElectrics lab at U. Colorado, co-authored a preprint describing the surgical technique and functional and histologic characterization of a long-term cervical VNS implant in mice. Work done in collaboration with Cristin Welle (U. Colorado) and Robert Froemke (New York University).

BioRxiv preprint

Spring 2020

Paper published in Scientific Reports

Anodal block permits directional vagus nerve stimulation

Umair Ahmed and Yao-Chuan Chang, post-docs at the TNP lab, co-authored a paper in which, using afferent and efferent physiological effects of VNS and stimulus-evoked compound action potentials, they demonstrated that the mechanism of anodal block permits directional VNS using rectangular waveforms.

Open-access paper

Discussion of the paper from Ruairi Mackenzie

Coverage by Business Wire

Winter 2019-20

Oral presentation at NANS 23rd Annual Meeting (Las Vegas, NV)

An implant for chronic cervical VNS in mice

Ibrahim Mughrabi, post-doc at the TNP lab, discusses the surgical technique for a novel chronic vagus nerve implant in mice, and the methodology for and results of its longitudinal in vivo physiological testing, up to 90 days post-implant.


Coverage by Innovate LI portal

Winter 2019-20

Review paper published in Bioelectronic Medicine

Pulmonary arterial hypertension: the case for a bioelectronic treatment

Despoina Ntiloudi et al. discuss how bioelectronic medicine, and VNS in particular, can find an application in the treatment of pulmonary arterial hypertension, a lethal disease of the pulmonary vessels and the right ventricle.

Open access paper

Coverage by Pulmonary Hypertension News

Winter 2019-20

Review paper published in Bioelectronic Medicine

Pulmonary arterial hypertension: the case for a bioelectronic treatment

Despoina Ntiloudi et al. discuss how bioelectronic medicine, and VNS in particular, can find an application in the treatment of pulmonary arterial hypertension, a lethal disease of the pulmonary vessels and the right ventricle.

Open access paper

Coverage by Pulmonary Hypertension News

Fall 2019

Lab posters at Society for Neuroscience 2019 Annual Meeting (Chicago, IL)

The TNP lab is represented by 3 posters at this year's Neuroscience conference.:

1. Directional biasing of vagal fiber activation using anodal block waveforms

  • Umair Ahmed et al. study how anodal block can be used as a method to bias afferent or efferent fiber activation in VNS

  • 770.05/R13 (Cardiovascular regulation II)

  • Wed Oct 23, 1-5pm (1-2pm)

  • Abstract

2. Vagus nerve stimulation and induced cortical plasticity in non-human primates

  • Irene Rembado et al. report on the effects of closed-loop VNS on brain stimulation-induced cortical plasticity in monkeys.

  • 285.19/C10 (Spike timing-dependent plasticity)

  • Mon Oct 21, 8AM-12PM (10-11am)

  • Abstract

3. In-vitro mechanical and electrical validation of a flexible microelectrode

  • 314.22/P1 (Motor cortex and motor learning)

  • Mond Oct 21, 8AM-12PM (9-10AM)

  • Abstract

Fall 2019

Invited talk at Neuromodulation: The Science (Napa, CA)

Physiologic closed-loop control using neurostimulation

On October 5, at 9 AM (local time), Stavros Zanos will speak on using closed-loop neurostimulation to modulate dynamic physiological processes in a responsive and adaptive manner. Two applications will be discussed in more detail: induction of neuroplasticity in the central nervous system using cortical stimulation, and control of cardiac function within a desired range of parameters using vagus nerve stimulation.

More info: NTS 2019 Agenda

Fall 2019

Invited talk at Data, Learning, Inference (DALI) 2019 (Donostia-San Sebastian, Spain)

Real-time bidirectional interfacing with the nervous system: lessons from biology and engineering

On September 5, at 6 pm(local time), Stavros Zanos will speak on the biology and engineering challenges, and ways to address them, that arise from 2 of the main requirements for a real-time bidirectional interface with the central and peripheral nervous system: the semi-real-time operation of a closed-loop system that records, analyzes and stimulates, and the maintenance of a reliable chronic interface with the nervous tissue.

More info: DALI: Brain-Machine Interfaces

Summer 2019

Oral presentation at the 2019 IEEE Engineering in Medicine and Biology Conference (Berlin, Germany)

Extraction of evoked compound nerve action potentials from vagus nerve recordings

On July 27, at 11AM (local time), Yao-Chuan Chang, post-doc at the TNP lab, will speak on a methodology to stimulate and record evoked potentials from the vagus nerve in rats, and to suppress non-neural components of these recordings (ECG, muscle activity, stimulus artifacts). Such evoked potentials can quantify the recruitment of different types of nerve fibers by VNS and therefore used to optimize VNS therapies.

Spring 2019

Invited Lecture at Endocrinology/ Cardiology Grand Rounds at Lenox Hill Hospital

Fiber-specific Vagus Nerve Stimulation in the Bioelectronic Treatment of Cardiovascular Disease

On Tuesday, May 7, Stavros Zanos will discuss the principles of and new techniques for fiber-specific VNS and its application in the treatment of cardiovascular diseases.

Spring 2019

Joint GE-Feinstein paper published in Nature Communications

Noninvasive sub-organ ultrasound stimulation for targeted neuromodulation

Cotero V, Fan Y, Tsaava T, Kressel AM, Hancu I, Fitzgerald P, Wallace K, Kaanumalle S, Graf J, Rigby W, Kao T-Z, Roberts J, Bhushan C, Joel S, Coleman TR, Zanos S, Tracey KJ, Ashe J, Chavan SS, Puleo C

Spring 2019

Posters at DARPA ElectRx/TNT PI Meeting (Boulder, CO)

Vagal-evoked cortical potentials in monkeys are modulated by brain state

Rembado I, Su D, Levari A, Shupe L, Fetz EE, Zanos S

Using implantable electronics in freely behaving monkeys, we are showing that cervical VNS elicits vagally-evoked cortical potentials that are modulated by the behavioral/brain state during which they are delivered.

Auricular vagus nerve stimulation for cortical plasticity and behavioral augmentation in monkeys

Rembado I, Su D, Boyd H, Amoeni B, Kemp I, Morse A, Birch C, Shupe L, Perlmutter S, Fetz EE, Zanos S

A closed-loop cortical stimulation (CS) paradigm that induces cortical plasticity is tested in conjunction with auricular branch VNS. We find that when VNS is delivered concurrently with CS, plasticity is reduced; when VNS is delivered at least 500 ms before CS, the plasticity effect is enhanced.

Winter 2018-2019

Review paper published in Cold Spring Harbor Perspectives in Medicine

Closed-loop neuromodulation in physiological and translational research

In this review, the reasons and the conditions for using closed-loop neuromodulation (CLN) are discussed, the basic components of a CLN system are described, and examples of CLN systems used in physiological and translational research are presented. Part of Bioelectronic Medicine collection of monographs.

Fall 2018

Invited presentation at Neuromodulation: The Science 2018 (Cleveland, OH)

Afferent and efferent effects of vagus nerve stimulation in different animal models

On Sunday, November 4, Stavros Zanos will discuss some of the afferent and efferent neural and physiological effects of VNS in rodents, swine and nonhuman primates, their dependence on stimulation parameters, and ways to optimize them in the context of therapeutic bioelectronic medicine applications.

Schedule (PDF)

Fall 2018

Poster presentation at Society for Neuroscience 2018 Annual Meeting (San Diego, CA)

Vagal-evoked cortical potentials in monkeys follow a circadian pattern

Irene Rembado discusses the use of autonomous, portable electronics to measure and quantify monkey cortical responses to cervical VNS, as a function of cortical area, VN stimulation parameters and, more importantly, time of day; it is found that vagal-evoked potentials follow a circadian pattern.!/4649/presentation/22516

Summer 2018

Paper published in Current Biology

Phase-locked stimulation during cortical beta oscillations produces bidirectional synaptic plasticity in awake monkeys

Our paper on cortical oscillations, closed-loop brain stimulation and activity-dependent neural plasticity in monkeys was published on Current Biology. We find that when cortical stimulation coincides with cortical beta oscillations, short-term synaptic plasticity effects occur, whose direction (potentiation or depression) depends on the oscillatory phase at which stimulation was delivered.

Discussion of the paper from Thilo Womelsdorf and Kari Hoffman

Spring 2018

Sponsored research program at Feinstein

Bioelectronic therapy of pulmonary arterial hypertension

Over the next few years, the Translational Neurophysiology (TNP) lab will conduct preclinical research on a bioelectronic therapy of pulmonary arterial hypertension (PAH). PAH is characterized by increased resistance in the pulmonary vessels, which may progress to heart failure and death. We will test whether vagus nerve stimulation with the appropriate device, electrode, electrode placement and stimulation parameters can selectively produce vasodilation in the pulmonary circulation, relieve symptoms and delay the progression of the disease. Collaborators in this project include the Cardiopulmonary Resuscitation Lab (Lance Becker), the Bioelectronics Lab (Timir Datta), the Microfabrication Lab (Loren Rieth) and the Neural Decoding Lab (Theo Zanos).

This program is supported by a generous research grant from United Therapeutics.

Spring 2018

Invited lecture at Experimental Biology 2018 (San Diego, CA)

Closed-loop neuromodulation in physiological and translational research

Stavros Zanos discusses the principles, uses and limitations of closed-loop neuromodulation systems in basic and translational research, and applications in clinical therapeutics.

Spring 2017

Paper published in Frontiers in Behavioral Neuroscience

Cycle-triggered cortical stimulation during slow wave sleep facilitates learning a BMI task

Delta wave-triggered cortical stimulation leads to faster learning of a brain-machine interface task that depends on oscillatory activity from the stimulated cortical site.

Spring 2017

Stavros Zanos joins Feinstein Institute for Medical Research

Stavros Zanos recently accepted the position of Assistant Professor at the Feinstein Institute for Medical Research, in Manhasset, New York. In his new position, Stavros will continue and expand his current research in neurophysiology and neuromodulation, develop new translational animal models to study bioelectronic medicine-based therapies and test these therapies in a variety of human diseases. [More...]

Winter 20016-2017

DARPA award to Stavros Zanos and Eb Fetz

VNS and neuroplasticity

Our UW group was awarded $1.3M to study the use of vagus nerve stimulation (VNS) to control brain plasticity. The 2.5-year award comes from DARPA's Targeted Neuroplasticity Training program (program officer: Doug Weber). Stavros Zanos and Eb Fetz, the two PIs, will join efforts with Steve Perlmutter, PhD, Irene Rembado, PhD, David Su, MD and a number of University of Washington scientists and students to elucidate the mechanisms through which VNS alters brain function and to leverage VNS to control targeted cortical plasticity and augment cognitive performace in nonhuman primates. The research will take place at the WA National Primate Center at the University of Washington. [More...]

Fall 2016

UW group presentations at the Society for Neuroscience 2016 Annual Meeting (San Diego, CA)

Our groups will present the latest research findings on the effects of vagus nerve stimulation on brain function in monkeys, on inducing cortical plasticity using invasive neurostimation in humans and on a new wireless bidirectional BCI system. Also, Stavros Zanos will present the latest version of our closed-loop neurostimulation system (Neurochip3) at the CSNE booth.

Zanos S, Moorjani S, Sabesan S, Fetz EE: Effects of vagus nerve stimulation on cortical activity and excitability in the nonhuman primate [Abstract]

Ozturk Y, Su Y, Moon KS, Perlmutter S, Zanos S, Fetz EE: A wireless bidirectional brain machine interface [Abstract]

Caldwell DJ, Olson JD, Wander JD, Zanos S, Sarma D, Fetz EE, Rao R, Ojemann JG: Exploration of the phase and dose dependence of cortico-cortical evoked potentials during beta-oscillation triggered direct electrical stimulation in humans [Abstract]

Spring 2016

UW group presentations at North American Neuromodulation Society / Neural Interfaces Joint Meeting (Baltimore, MD)

Our groups will present 2 posters on recent work on cortical plasticity, in monkeys and humans.

Zanos S, Rembado I, Fetz E: Closed-loop ECoG Stimulation Induces Hebbian Plasticity in Sensorimotor Cortex of Awake Monkeys

Caldwell D, Olson J, Wander J, Zanos S, Sarma D, Su D, Cronin J, Collins J, Wu J, Johnson L, Weaver K, Fetz E, Rao R, Ojemann J: Enhancement of Cortico-Cortical Evoked Potentials by Beta-Oscillation Triggered Direct Electrical Stimulation in Humans

Winter 2015-2016

Presentations at CSNE site visit in Seattle

Our group at the annual NSF site visit to UW's CSNE had 2 presentations with latest work from the lab.

Moorjani S, Zanos S, Fetz E: Electrochemical neural interfaces for inducing motor plasticity

Bogaard A, Zanos S, Fetz E: Transcranial direct current stimulation for targeted cortical plasticity

Fall 2015

UW group presentations at the Society for Neuroscience 2015 annual meeting (Chicago, IL)

Our group at the University of Washington presented two posters this year. Watch out for upcoming papers!

Rembado I, Zanos S, Fetz E: Effect of sleep-related cortical stimulation on learning a BCI task [Abstract]

Bogaard A, Zanos S, Richardson A, Robinson O, Fetz E: Electrical cortical stimulation paired with volitional movement produces subsequent intra- and inter-hemispheric effects in the nonhuman primate [Abstract]