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Medtronic study shows Micra's accelerometer improves cardiac function in patients

MDBR Staff Writer Published 14 May 2018

Medtronic’s Marvel trial showed that mechanical sensor in Micra transcatheter pacing system (TPS) helped to improve cardiac function in patients with sinus rhythm and atrioventricular (AV) block.

The results of the study showed that an investigational algorithm using the accelerometer signal in the Micra TPS may restore AV synchrony.

Micra atrial tracking using a ventricular accelerometer (Marvel) feasibility study assessed 64 patients who already had a Micra TPS at 12 centers in nine countries.

During the study, investigators assessed the potential of Micra's accelerometer to monitor and detect contractions in the atrium, even after the device is implanted in the ventricle.

They also assessed the potential of Micra's ability to pace the ventricle to contract in sequence with the atrium, enabling to create AV synchrony.

AV synchrony has been measured by using continuous device telemetry and an electrocardiogram through Holter monitor.

According to Medtronic, the study demonstrated that the percentage of AV beats in synchrony during pacing with the AV algorithm was 87% among all study patients, 80% in high-degree AV block patients and 94.5% in patients with predominantly intact AV conduction during the study.

Medtronic cardiac and vascular group’s cardiac rhythm and heart failure division chief medical officer and vice president Dr Rob Kowal said: "We are encouraged by the results of MARVEL, which support our commitment to extending the benefits of Micra TPS to broader patient groups.

"We are investing in additional clinical studies to confirm this accelerometer-based leadless pacing approach will benefit patients with AV block who make up approximately 40 percent of the pacemaker population worldwide."

In 2015, the company first launched Micra TPS in 2015, while in the US in 2016 for patients who require a single-chamber pacemaker.

Micra TPS, which is less than one-tenth the size of traditional pacemakers, is similar to the size of a large vitamin.

Image: Medtronic operational headquarters. Photo: courtesy of Medtronic.