Trigger and synchronization windows. Trigger and synchronization windows. If a patient signal occurs within the trigger window, inspiration is patient-triggered. If a patient signal occurs within a synchronization window, inspiration is ventilator-triggered (or cycled if at the end of inspiration) and patient-synchronized. Note that, in general, a trigger window is used with continuous mandatory ventilation, a synchronization window is used with intermittent mandatory ventilation. Robert L Chatburn et al. Respir Care 2014;59:1747-1763 (c) 2012 by Daedalus Enterprises, Inc.