Manual ventilation during magnetic resonance imaging.

Mechanical ventilation during magnetic resonance imaging (MRI) requires a specially constructed ventilator that contains no ferromagnetic components; however, the expense of acquiring such a ventilator may not be warranted if projected use is infrequent. We adapted a Laerdal manual resuscitator to allow its use during MRI, and report the simulation and monitoring procedure that we developed and the successful ventilation of three pediatric patients with the device.