A cardiac monitoring apparatus for determining the occurrence of sinus syndrome condition of the patient, an electrode for sensing a cardiac signal, is electrically connected to an electrode having a built-in circuitry for receiving sensed cardiac signals a sensing module, coupled to the sensing module determines RR interval variability in RR interval variation session according to the sensed cardiac signals to determine the presence or absence of occurrence of a P-wave in the RR interval variation session, P It determines whether to correspond to the sick sinus index in response to occurrence of the wave, to increment the sick sinus count in response to corresponding to sick sinus index corresponds to sick sinus burden in accordance with the increment of sick sinus count it is judged whether or not the apparatus comprising a processor configured to determine the occurrence of sinus syndrome in response to corresponding to sick sinus burden.
.BACKGROUND 9