Abstract
PurposeTo evaluate MRI issues at 3-Tesla for a ventricular assist device (VAD).MethodsThe AB5000 Ventricle with a prototype Nitinol wire-reinforced In-Flow Cannula and Out-Flow Cannula attached (Abiomed, Inc., Danvers, MA) was evaluated for magnetic field interactions, heating, and artifacts at 3-Tesla. MRI-related heating was assessed with the device in a gelled-saline-filled, head/torso phantom using a transmit/received RF body coil while performing MRI at a whole body averaged SAR of 3-W/kg for 15-min. Artifacts were assessed for the main metallic component of this VAD (atrial cannula) using T1-weighted, spin echo and gradient echo pulse sequences.ResultsThe AB5000 Ventricle with the prototype In-Flow Cannula and Out-Flow Cannula attached showed relatively minor magnetic field interactions that will not cause movement in situ. Heating was not excessive (highest temperature change, +0.8°C). Artifacts may create issues for diagnostic imaging if the area of interest is in the same area or close to the implanted metallic component of this VAD (i.e., the venous cannula).ConclusionThe results of this investigation demonstrated that it would be acceptable for a patient with this VAD (AB5000 Ventricle with a prototype Nitinol wire-reinforced In-Flow Cannula and Out-Flow Cannula attached) to undergo MRI at 3-Tesla or less. Notably, it is likely that the operation console for this device requires positioning a suitable distance (beyond the 100 Gauss line or in the MR control room) from the 3-Tesla MR system to ensure proper function of the VAD.
Highlights
A ventricular assist device (VAD) is used to provide temporary mechanical support for treatment of acute heart failure with the primary goal of producing rapid restoration of the circulation and stabilization of hemodynamics [1,2]
In consideration of the growing use of the AB5000 Circulatory Support System as well as that of 3-Tesla MRI examinations, especially for cardiac MR procedure, the purpose of this investigation was to assess magnetic field interactions, heating, and artifacts to determine if it would be acceptable to scan a patient with this VAD using the modified in-flow cannula
It is likely that the operation console for this device requires positioning a suitable distance from the 3-Tesla MR system to ensure proper function of the VAD
Summary
A ventricular assist device (VAD) is used to provide temporary mechanical support for treatment of acute heart failure with the primary goal of producing rapid restoration of the circulation and stabilization of hemodynamics [1,2]. Journal of Cardiovascular Magnetic Resonance 2008, 10:23 http://www.jcmr-online.com/content/10/1/23 poreal device that can achieve pulsatile hemodynamic support up to 6 liters of flow per minute [2,3,4]. This device is increasingly used to manage patients because it offers the advantage of allowing patients to ambulate, which greatly assists in the recovery process [2,3,4]. In consideration of the growing use of the AB5000 Circulatory Support System as well as that of 3-Tesla MRI examinations, especially for cardiac MR procedure, the purpose of this investigation was to assess magnetic field interactions, heating, and artifacts to determine if it would be acceptable to scan a patient with this VAD using the modified in-flow cannula. It is likely that the operation console for this device requires positioning a suitable distance (beyond the 100 Gauss line or in the MR control room) from the 3-Tesla MR system to ensure proper function of the VAD
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