Techniques for determining blood pressure based on morphological features of pulses

A system for measuring blood pressure, comprising:

• a wearable device configured to acquire physiological data from a user, the wearable device comprising:
• one or more light-emitting components configured to transmit, during a time interval including a heartbeat of the user, first light associated with a first wavelength and second light associated with a second wavelength, wherein the first light comprises infrared light having the first wavelength, and wherein the second light comprises red light having the second wavelength;
• and
• one or more photodetectors configured to receive the first light and the second light emitted by the one or more light-emitting components;
• and
• one or more processors communicatively coupled with the wearable device, the one or more processors configured to:
• acquire photoplethysmogram (PPG) data from the user based at least in part on the first light and the second light received by the one or more photodetectors, the PPG data comprising at least a first PPG waveform acquired using the infrared light and a second PPG waveform acquired using the red light;
• determine a first set of morphological features and a second set of morphological features associated with the first PPG waveform and the second PPG waveform, respectively;
• compare the first set of morphological features and the second set of morphological features, the first set of morphological features comprising a peak of a second derivative of the first PPG waveform and the second set of the morphological features comprising a peak of a second derivative of the second PPG waveform;
• determine a correlation coefficient between the first PPG waveform and the second PPG waveform based at least in part on a comparison between the peak of the second derivative of the first PPG waveform and the peak of the second derivative of the second PPG waveform;
• and
• determine a blood pressure metric for the user based at least in part on the correlation coefficient and the comparison of the peak of the second derivative of the first PPG waveform and the peak of the second derivative of the second PPG waveform.