Detection of changes in cardiac health

A system comprising:

• a memory;
• and
• a processing device operatively coupled to the memory, the processing device to:
• generate a baseline median beat for a user;
• in response to receiving a new ECG data entry comprising new electrocardiogram (ECG) data, determine a cross-correlation of the new ECG data with the baseline median beat;
• determine whether the new ECG data of the user represents a deviation from the baseline median beat with respect to one or more characteristics that indicate abnormal morphologies based on the determined cross-correlation;
• and
• in response to determining that the new ECG data represents a deviation from the baseline median beat with respect to the one or more characteristics that indicate abnormal morphologies, append a deviation indication to the new ECG data entry.

A non-transitory computer-readable medium having instructions stored thereon which, when executed by a processing device, cause the processing device to:

• generate a baseline median beat for a user;
• in response to receiving a new ECG data entry comprising new electrocardiogram (ECG) data, determine a cross-correlation of the new ECG data with the baseline median beat;
• determine whether the new ECG data of the user represents a deviation from the baseline median beat with respect to one or more characteristics that indicate abnormal morphologies based on the determined cross-correlation;
• and
• in response to determining that the new ECG data represents a deviation from the baseline median beat with respect to the one or more characteristics that indicate abnormal morphologies, append a deviation indication to the new ECG data entry.