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1. A ventilator for ventilating a person with a respiratory gas, wherein the ventilator comprises a sensor unit for determining a ventilation pressure and/or a respiratory flow and/or a tidal volume of the respiratory gas delivered to the person, and further comprises a breath analyzer for a detection of breathing events of the person ventilated with the respiratory gas, wherein the breath analyzer comprises an electronic computing and storage unit which is configured to receive a signal corresponding to the ventilation pressure and/or the respiratory flow and/or the tidal volume of the respiratory gas delivered to the person and, during a predetermined analysis duration, to detect a curve of the signal by a curve analyzer, the computing and storage unit being configured to determine from the signal curve a signal segment which, on the basis of a predefined segment duration or a segment duration detected from the signal curve, is set shorter than an analysis duration, and to assign the determined signal segment by a comparator to one of several breath classes and in each case to store a frequency of occurrence, of the breath class assigned during the analysis duration, in a frequency counter provided for each breath class in the computing and storage unit and to store at least one of the signal segments determined during the analysis duration, but fewer than a frequency of occurrence detected in the frequency counter, for each assigned breath class in the computing and storage unit, wherein the sensor unit is coupled in a data-transmitting manner to the computing and storage unit of the breath analyzer and is configured to generate a signal corresponding to a determined ventilation pressure and/or to a determined respiratory flow and/or to a determined tidal volume of the respiratory gas and to deliver this signal to the computing and storage unit, wherein the breath classes include breath types which represent an inspiratory flow limitation and/or an expiratory flow limitation and/or an intrinsic positive end-expiratory pressure (PEEP), and/or an ineffective breathing effort and/or a double breathing effort, and wherein, upon detection of an inspiratory flow limitation and/or an expiratory flow limitation and/or an intrinsic PEEP and/or an ineffective breathing effort and/or a double breathing effort, at least one message is output via a data transmission interface and/or on a display or is stored in an external data receiver unit and/or an alarm is sent to the external data receiver unit.
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