The Science Journal of the American Association for Respiratory Care

2008 OPEN FORUM Abstracts

THREE MAGNETIC RESONANCE (MR) ENVIRONMENTS AND THE MR CONDITIONAL SERVO-I VENTILATOR

Joe Hylton1, Kenny Winn1



Background: The MR Suite has a unique environment which demands differing medical equipment. The magnetic field within the MR environment requires special equipment. Radio frequency emissions places demands on the MR imaging and the medical equipment. These issues must be addressed to optimize patent safety and allow for quality imaging. In the hospital setting there is a need for advanced ventilation in the MR suite. However, some patients cannot be switched to a non-ICU ventilator due to critical pulmonary conditions. The MR Conditional Servo-i gives prospect to the clinician for consistent ventilation.

Methods: A Pre-use check was performed on the MR Conditional Servo-i ventilator before initiating testing. Outside of each MRI suite, the ventilator settings were entered in the adult and infant modes: Pressure Control of 25 cmH2O, Respiratory Rate of 25 breaths/min, PEEP of 5 cmH2O, Inspiratory Time of 1 second, FiO2 of 0.4. Peak pressure, PEEP, RR, Inspired and Exhaled Tidal Volume and FiO2 were recorded in each mode. Inside the MR suite, a calibrated gauss meter was utilized to identify the 200 gauss distance from each magnet. The ventilator was placed at the 200 gauss line; the wheels were then locked for safety. A scan was performed with a phantom dummy. During the phantom scan, the clinical specialists recorded the measured values in adult and infant modes. The scan was then read by a radiologist and the MR engineer to determine the quality of the image.

Results: Measurements made during phantom scans demonstrate that ventilation is not compromised when using the MR Conditional Servo-i. Artifact was not noted when the MR Conditional Servo-i is behind the 200 gauss line. Thus, the MR Conditional Servo-i ventilator provides consistent measurements without the compromise of patient safety or loss of image quality.

Conclusion: Critically ill patients receiving mechanical ventilation often require MR imaging. Anxiety among the medical staff, patient safety issues and delays in care exist when a non-ICU ventilator is required for the MR environment. With the MR Conditional Servo-i there are now several options for patients on advanced modes of ventilation who require transport to the MR suite. The MR Conditional Servo-i ventilator enables the medical staff to utilize a familiar ICU tool for transport. Patient safety is maintained and care is not delayed when there is a need to transport a critically ill patient to the MR suite.