New Study Reveals WiSE-CRT Technology as Safe

Heart Rhythm Society pic
Heart Rhythm Society

With a medical career spanning more than 25 years, Dr. Sanjiv M. Narayan has been recognized as a leading a physician and a researcher in the field of cardiology. He is a faculty member at Stanford University, where he co-directs the school’s new Stanford Arrhythmia Center. Committed to active engagement in his field, Dr. Sanjiv Narayan is a longtime member of the Heart Rhythm Society.

According to a first-of-its-kind study presented at a Heart Rhythm Society scientific event, Wireless Stimulation Endocardially for cardiac resynchronization therapy (WiSE-CRT) has been proven to be safe for patients who were studied two years after having the device implanted. These tiny devices are the only current means of controlling heart pacing from inside the left ventricle of the heart, making use of ultrasound signals transmitted to an electrode placed in the ventricle itself. The study’s lead author, Simon James, MRCP, expressed pleasure with the study’s results, which represent the first real glimpse at the long-term feasibility of WiSE-CRT implants.

ACC Journal Examines Blood Thinner Prescription in A-Fib Patients


 A-Fib Patients pic
A-Fib Patients

For over a decade, Dr. Sanjiv Narayan has been a leading voice in cardiology, both as a physician and a researcher. As a faculty member at Stanford University, he is responsible for overseeing the brand-new Stanford Arrhythmia Center, an incubator that will serve to help spawn innovative treatments in arrhythmia medicine. In addition to his work as an educator and clinician, Dr. Sanjiv Narayan is a fellow of the American College of Cardiology.

Recently published research in the Journal of the American College of Cardiology reveals that patients diagnosed with atrial fibrillation typically do not get the blood thinners they need to reduce their stroke risk. Because these patients are at a particularly elevated risk for stroke, they are usually prescribed oral anticoagulants to reduce this risk. But in studying more than 600,000 patient files through the National Cardiovascular Data Registry PINNACLE Registry, the study authors found that there was only a small increase in usage of these drugs among atrial fibrillation patients over the course of approximately seven years.

Approximately 40 percent of these patients are still not receiving prescriptions for these medications from their doctors. And even when they do, some research has shown that they are getting too low a dosage to adequately address their stroke risk. Consequently, some strokes are happening in atrial fibrillation patients that could have been otherwise prevented. The lead author of this research study, Lucas N. Marzec, MD, urged further study to determine why these important medications are not being prescribed properly.

University of Michigan Study Uses Big Data to Track Sleep Habits

Sleep Habits pic
Sleep Habits

Dr. Sanjiv M. Narayan serves as a professor of medicine at Stanford University. Alongside his teaching duties, Dr. Sanjiv M. Narayan is contributing to the development of the Stanford Arrhythmia Center. He also is a leader in the study of sleep, sleep-related conditions, and the technologies that help physicians better understand sleep.

Mathematicians at the University of Michigan recently led a large sleep study meant to help scientists understand various pressures on human sleep schedules. Specifically, researchers wanted to understand how the competing influences of the modern lifestyle and the circadian rhythm impact sleep. The study relied on data from a free smartphone app called Entrain that was designed to mitigate jet lag.

This data revealed how age, gender, light levels, location, and other factors impact the amount of sleep people get. It suggests that while societal factors tend to govern when people go to bed, it is the circadian clock that influences wake-up time. Social responsibilities such as work and children play an obvious role in wake-up time as well, but not to the same extent that they keep people up at night.