Clinical investigation of some sleep disorders, stress testing, ambulatory monitoring requires simultaneous monitoring of heart rate and respiratory rates.  Numerous methods have been reported for deriving respiratory information from the electrocardiogram (ECG).  Initially ECG signal is sent to microcontroller AT89S52 through ADC0848. The digital samples are once again transmitted to personal computer via a cable. The digital data is read with the help of graphical user interface software – Visual C++ (serial port programming). The data is stored in an array and the QRS peaks per minute are detected & heart rate is calculated. As these QRS peaks consist of respiratory information, an algorithm will be applied onto the QRS data to find the number of slopes per minute, which gives the respiratory rate. Hence the Heart Rate & Respiratory Rate per minute will be calculated and displayed real time on PC.
NAGADEEPTHI, M. R.,; BHARADWAJ, SUSHRUTHA M.; and PUSHPALATHA, B.G.
"ESTIMATION OF RESPIRATORY RATE FROM ECG,"
International Journal of Electronics Signals and Systems: Vol. 2
, Article 15.
Available at: https://www.interscience.in/ijess/vol2/iss3/15