Abstract 17411: Exploring the Interference Between Wireless Capsule Endoscopy and Cardiac Device Radiofrequency.
Methods: In-vitro experiments were conducted in a specially-designed saline bath simulating the distances expected during concomitant use of these devices. Current generation dual-chamber PMs and ICDs (St Jude Medical, Medtronic and Boston Scientific) attached to appropriate leads were placed in the bath with and without the LVAD (HeartMate 2, Thoratec). The PillCam (Given Imaging) was placed in the bath and evaluated at physiologic distances from the device and at 1, 5 and 10cm from the leads. PillCam images of a standardized text gradient were recorded continuously, downloaded and evaluated. PMs, ICDs and the LVAD were monitored continuously and programmed and interrogated in presence of each other to identify interference. All programming and interrogation were performed in the DDD mode. When available, both radiofrequency and inductive programming were performed. The LVAD was evaluated at 9000 and 9800 rpm and monitored for power, speed, flow and pulsatility index in a closed-loop simulator. Maximal energy, commanded shocks were delivered from each ICD in the presence of the PillCam and LVAD. Continuous monitoring of each device was performed during capacitor charge and shock delivery. Finally, a spectrometer was used to evaluate any in-hospital external signal in order to evaluate ambient external interference.
Results: All devices performed according to specifications. Specifically, there was no degradation of images obtained during maneuvers with any devices. Furthermore, there was no effect on any device function during PillCam operation.
Conclusions: No precautions are indicated for the concomitant use of the devices tested. Understanding of the safety of the concomitant use of these devices is critical as most patients with LVADs have ICDs and GI bleeding is a common complication of continuous flow LVADs.
- © 2010 by American Heart Association, Inc.