Ventilation systems and/or methods are disclosed in which a cadence for the administration of ventilations is provided, selected and/or input. A notification is output at the completion of an interval based on the cadence. A subsequent interval can be started upon completion of a prior interval or can be started based on an indication that a ventilation has been administered. The elapsed time, from the beginning of the interval, and/or expiry of the interval, to the indication that a ventilation has been administered, can be tracked, monitored and/or displayed. Such indication can be provided by a user and/or based on sensor data indicative of a ventilation administration, and the indication can also indicate that an expected ventilation was not administered.
