HKElectrocardiogram High Heart Rate classification

How do we differentiate the high heart rate and sinus rhythm. In the HKSampleQuery it returns classification as sinusRhythm for both (High Heart Rate and SinusRhythm) where as in the Health App it display the classifications as High Heart Rate and SinusRhythm separately.
HKElectrocardiogram High Heart Rate classification
 
 
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