60
CardioMem
®
CM 100 XT
78812021-EN
16 Description of automatic rhythm
detection
16.1 Heart rate detection
The heart rate in beats per minute [bpm] is continuously calcu-
lated from the interval of two consecutive R waves. Heart rate de-
tection is an essential feature of the recorder. Heart rates in the
range between 30 bpm and 240 bpm are detected with a toler-
ance of max. 10%.
In case of electromagnetic interference, the heart rate detection
can produce false results or temporarily fail.
The effectiveness of the heart rate detection was not proven for
patients doing any kind of pacemaker therapy. Pacemaker
rhythms could be detected not precisely.
16.2 Detection of bradycardia and tachycardia
A bradycardia event is recorded once the specified pre-event time
has elapsed and the heart rate has fallen below the specified limit
value for more than three consecutive beats.
The next bradycardia event will not be triggered until the end of
the previous bradycardia event has been detected. To be able to
determine the end of a bradycardia, the heart rate must not fall
below the pre-set limit value for at least 90 beats.
A tachycardia event is triggered once the specified pre-event time
has elapsed and the heart rate has exceeded the specified limit
value for more than four consecutive beats.
The next tachycardia event will not be triggered until the end of
the previous tachycardia event has been detected. To be able to
determine the end of a tachycardia, the heart rate must not ex-
ceed the specified limit value for at least 90 beats.
