An Overview of Atrial Flutter


Atrial Flutter pic
Atrial Flutter

Dr. Sanjiv M. Narayan serves as a professor of medicine and the director of the Stanford Arrhythmia Center at Stanford University. Over the course of his career, Dr. Sanjiv Narayan’s research on atrial fibrillation has been cited in multiple studies pertaining to the condition and related disorders, such as atrial flutter.

Atrial flutter is a cardiac abnormality wherein the upper chambers of the heart beat too fast, causing muscles in the area to contract and fall out of sync with the heart’s lower chambers. The heart beats an average of 250 to 400 times per minute, as opposed to the healthy rate of 60 to 100. Compared to atrial fibrillation, the rapid heartbeat occurs in a regular, more organized manner and appears as a sawtooth pattern on electrocardiogram tests.

Because the rapid heartbeat stays at a steady pace for people with atrial flutter, some individuals will not notice any symptoms. Those who do may experience shortness of breath, chest discomfort, heart palpitations, fainting, and dizziness or lightheadedness. While not life-threatening, the condition can potentially lead to more series complications if left untreated. For instance, it increases the risk for blood clots, which can in turn cause stroke or heart failure.


Acutus and Stereotaxis Partner to Improve Electrophysiology Tools


Stereotaxis’s Niobe system pic
Stereotaxis’s Niobe system

A Heart Rhythm Society member and advocate, Dr. Sanjiv Narayan is a cardiac research scientist and Southern California professor who has published on subjects related to mapping and ablation of atrial fibrillation (AF). Past studies co-authored by Dr. Sanjiv Narayan showed that mapping AF can identify drivers, which supports the work of groundbreaking firms like Acutus Medical, which announced in mid-2018 an important collaboration with robotic technology company Stereotaxis.

The goal of this agreement is to support the work of electrophysiology physicians and improve levels of care for cardiac arrhythmia patients by integrating Acutus Medical AcQMap technology with the Niobe Magnetic Navigation System by Stereotaxis.

Acutus first received FDA approval for its AcQMap technology in October 2017. The technology is a high-resolution 3D imaging system that relies on ultrasound technology combined with dipole density mapping to visualize heartbeats in real time. It gives physicians a tool to monitor a patient’s heart moment-to-moment during ablation procedures.

Stereotaxis’s Niobe system is a magnetic navigation system that gives physicians more exact, steady remote control over instruments used during procedures, including the catheters necessary for the ablation process. Leadership from both Acutus and Stereotaxis praised the “interoperability” of the two systems in a press release, contending the integration of the technologies will improve physician workflow, and has the potential to significantly improve the experience of cardiology patients.

Studying Atrial Fibrillation Terminated by Local Ablation

Atrial Flutter pic
Atrial Fibrillation

An experienced researcher specializing in atrial fibrillation, Dr. Sanjiv M. Narayan, professor of medicine at Stanford University, is responsible for developing innovative assessment tools for diagnosing heart arrhythmia conditions. Dr. Sanjiv M. Narayan’s research recently focused on the mechanisms of and relationship between localized ablation and persistent atrial fibrillation termination.

As part of a clinical trial, researchers hypothesized that local ablation sites where AF persistently terminates have certain indicators that can be analyzed through activation mapping techniques. To test this theory, they closely studied activation patterns that occurred solely in instances of AF termination via ablation.

After examining the results, the research team found patterns of either rotational or focal activity when mapping termination sites. Computer simulations also revealed rotational activation sequences, but the sequences were found to have increased sensitivity to activation timing, especially in areas where slow conduction was a factor. Based on these observations, the researchers stated that many currently used tools to map AF may not detect important regions, including sites of termination, and further studies should compare mapping approaches to guide ablation.

Acutus Medical Launches AcQMap Imaging and Mapping System

Acutus Medical pic
Acutus Medical

A professor of Medicine at Stanford University, Dr. Sanjiv M. Narayan is a well established atrial fibrillation (AF) researcher who has created technology-driven solutions for assessing complex heart arrhythmia conditions. Dr. Sanjiv M. Narayan’s foundational work has informed studies that apply novel technologies to map AF and find localized ablation targets.

In May 2018, Acutus Medical announced the launch of the high-resolution AcQMap imaging & mapping system, as well as a 3-D mapping catheter. Used together, these pieces of equipment generate real time ultrasound-enabled 3-D heart chamber images. Detecting and displaying charge-source and voltage-based maps, the AcQMap system is described as enabling physicians to better view “complex, irregular arrhythmias.”

With a clinical study of AcQMap having been launched, the potential for the FDA-approved system in enhancing AF retreatment ablation procedures is of intense interest. Acutus Medical also entered into a partnership with Stereotaxis in incorporating the latter firm’s magnetic navigation system within its AcQMap mapping and imaging system.

Basics of Atrial Fibrillation


Atrial Fibrillation pic
Atrial Fibrillation

Sanjiv M. Narayan has served as a professor of medicine at Stanford University since 2014. Sanjiv M. Narayan has published extensively on topics related to atrial fibrillation, an ongoing heart irregularity, with over two hundred articles and book chapters. His laboratory works to define mechanistic networks that can cause this condition, and his recent research focuses on ablation treatment focused at small ‘driver’ or ‘rotor’ regions that sustain the disorganization of atrial fibrillation.

Atrial fibrillation is a form of irregular and rapid heart rate in which the heart’s upper chambers stop synchronizing with the lower chambers. Beats can be chaotic and irregular, and often manifest as heart palpitations, shortness of breath, and generalized weakness. Individuals with atrial fibrillation may deal with the condition constantly, or have occasional episodes. While not life-threatening, it can require emergency treatment in certain circumstances.

Atrial fibrillation can also cause further complications. The irregularities in the heartbeat can lead to the formation of blood clots inside the heart, which can migrate around the body and block blood flow. This can cause a stroke if the blood clot lodges in the brain. Heart failure can occur if the irregularities weaken or exhaust the heart, causing the heart to circulate insufficient blood to serve the body.

Quick Tips for First-Time Cyclers


Cyclers pic

Dr. Sanjiv M. Narayan, a graduate of the University of Birmingham medical program, joined Stanford University as a professor of medicine in 2014. In this position he has played a driving role in the development of the Stanford Arrhythmia Center. Outside of work, Dr. Sanjiv Narayan stays active by cycling and swimming.

Cycling is a great way to experience new places while receiving a comprehensive workout. However, first-time cyclers may face a number of unexpected challenges.

For those who seek to get right into group cycling, for instance, riding in a paceline can be an unnerving experience. It takes some time to get used to riding so close to other cyclists. Instead of attempting to overcome anxieties associated with potentially crashing into other riders, individuals can simply hang near the back of the line, making use of the additional space and easier pace. As riders grow more confident in their positioning, they can move further up the line.

A more generalized tip is to effectively manage one’s recovery. Rest days are highly important, especially for new and young riders with less endurance. Cycling is an enjoyable, beneficial hobby, but cramming too many group and solo rides into one weekend can result in difficult riding conditions at best, and serious injuries at worst. Riders can consult with more experienced cyclists, and their physician, on an appropriate ride and rest cycle.

Understanding the Causes and Symptoms of Arrhythmia


Atrial Flutter pic

Sanjiv M. Narayan is a well-established cardiologist and medical researcher who has developed innovative atrial fibrillation solutions. In his position as a professor of Stanford University, Sanjiv M. Narayan is in the process of establishing a center focused on arrhythmia research and therapy. Arrhythmia is a condition that causes the heart to beat irregularly.

With a variety of symptoms, including a fluttering or racing heart, arrhythmia is caused by the electrical signals used to coordinate the heartbeat failing to work in sync. Common symptoms include a sense of breathlessness and dizziness. The causes of the condition range from mental stress to diabetes, as well as harmful habits, such as smoking and alcohol consumption. Arrhythmia with no apparent symptoms may be detected through EKGs or routine exams.

Medications can control, but do not generally cure arrhythmia. One traditional treatment involves the use of cardioversion, or an electrical shock used to reset the heart to its proper rhythm. Ablation therapy involves the movement of catheters through one’s blood vessels, so that the catheter tube destroys or scars small sections of problem heart tissue.