A kind of monitoring device with capnography ability, it uses the ventilation monitor controller including capnography monitor (20) and respiratory monitor (21), and the ventilation for being applied to patient and overventilation for the ventilation in non-overventilation, which is applied between patient, to be determined. In operation, the capnography waveform of capnography monitor (20) the analysis patient. The respiratory monitor (21) is based on partially or even wholly according to the instruction by capnography monitor (20) respiratory rate of the derived End-tidal carbon dioxide partial pressure and/or patient by patients exhalation to the analysis of capnography waveform, to determine that the ventilation of non-overventilation is applied to patient And based on partially or even wholly basis by capnography monitor (20) indicating collectively for both the derived End-tidal carbon dioxide partial pressure breathed out by patient and respiratory rate of patient to the analysis of capnography wave, to determine that the ventilation of overventilation is applied to patient.
