title: Confusing "No Shock Delivered" messages on Philips HeartStart XL and HeartStart MRx defibrillators may delay therapy.
abstract: When Philips HeartStart XL and HeartStart MRx defibrillators abort a discharge because they detect high transthoracic impedance, the message that appears may not adequately describe why the shock was not delivered. This could create confusion and delay therapy to the patient. Users should be aware of the problem so that they know what to do when such a message appears.
mesh_terms: D003142:Communication; D047548:Defibrillators; D004868:Equipment Failure; D004869:Equipment Safety; D006801:Humans