Application US20190104948

sensing an activity level of a user with a first sensor on a wristlet or a smartwatch worn by the user;

when the activity level is resting, sensing a heart rate parameter of the user with a second sensor on the smartwatch or wristlet;

determining a discordance is present between the activity level value and the heart rate parameter;

based on the presence of the discordance, indicating to the user, using the smartwatch or wristlet, a possibility of an arrhythmia being present; and

receiving electric signals of the user from an electrocardiogram sensor (“ECG”) on the smartwatch or wristlet to confirm a presence of the arrhythmia, wherein the ECG sensor comprises a first electrode and a second electrode.

a processor,

a first sensor configured to sense an activity level value of a user, wherein the first sensor is coupled to the processor,

a photopletysmogram (“PPG”) sensor configured to sense a heart rate parameter of the user when the activity level value is resting, wherein the PPG sensor is coupled to the processor;

an electrocardiogram (“ECG”) sensor configured to sense electrical signals of a heart, wherein the ECG sensor comprises a first electrode and a second electrode, and wherein the ECG sensor is coupled to the processor; and

a non-transitory computer readable storage medium encoded with a computer program including instructions executable by the processor to cause the processor to: determine if a discordance is present between the activity level value of the user and the heart rate parameter of the user; based on the presence of the discordance, indicate to the user a possibility of an arrhythmia being present; receive electric signals of the user from the ECG sensor to confirm the presence of the arrhythmia.