The present invention relates to a method and a system for monitoring respiration in an individual using a photoplethysmogram. It relates in particular to a method of monitoring respiration in an individual, comprising isolating a DC component of a photoplethysmography signal obtained from a nasal pulse oximetry probe, andmonitoring changes in an envelope of the isolated DC component of the photoplethysmography signal to determine a breathing cycle of the individual. It relates also to a system for monitoring respiration in an individual comprising a computer that isolates a DC component of a photoplethysmography signal obtained from a nasal pulse oximetry probe and monitors changes in an envelope of the isolated DC component to determine a breathing cycle of the individual.
