Mask providing positive airway pressure and measuring changes in blood pressure

A system for monitoring a blood pressure value from a patient, comprising:

• a wearable mask adapted to be coupled to a positive airway pressure (PAP) machine and configured to deliver a flow of gas generated by the PAP machine to an airway of a patient;
• a first sensor connected directly to the wearable mask, the first sensor comprising an optical sensor configured to measure a time-dependent optical waveform from a first region underneath a first portion of the wearable mask, the time-dependent optical waveform comprising a first pulse;
• a second sensor connected directly to the wearable mask, the second sensor comprising an impedance sensor configured to measure a time-dependent impedance waveform from a second region proximal to the wearable mask, the time-dependent impedance waveform comprising a second pulse;
• and,
• a processing system attached to the wearable mask, the processing system comprising a microprocessor configured to:
• 1) receive digital representations of both the first and second pulses;
• 2) process the digital representations to determine a time difference between the first and second pulses, or a parameter calculated therefrom;
• and 3) process the time difference, or the parameter calculated therefrom, to determine the blood pressure value.