Abstract: A method that includes receiving first and second detection signals and electrocardiograph signals; wherein the first detection signals result from an illumination, by an oxygen saturation sensor included in a device that may be removably attached to a user, of a sternal angle of a user by infrared pulses; wherein the second detection signals result from an illumination, by the oxygen saturation sensor, of the sternal angle of a user by visible light pulses; wherein the electrocardiograph signals may be detected by an electrocardiography sensor that may be included in the device; generating a first waveform template that may be responsive to the first detection signals; generating a second waveform template that may be responsive to the second detection signals; calculating an indication of the oxygen saturation characteristic of the user in response to the first and second detection signals; detecting cardiac cycle durations that may be based upon the first and second detection signals; detecting electrocard

Abstract: A method that includes receiving first and second detection signals and electrocardiograph signals; wherein the first detection signals result from an illumination, by an oxygen saturation sensor included in a device that may be removably attached to a user, of a sternal angle of a user by infrared pulses; wherein the second detection signals result from an illumination, by the oxygen saturation sensor, of the sternal angle of a user by visible light pulses; wherein the electrocardiograph signals may be detected by an electrocardiography sensor that may be included in the device; generating a first waveform template that may be responsive to the first detection signals; generating a second waveform template that may be responsive to the second detection signals; calculating an indication of the oxygen saturation characteristic of the user in response to the first and second detection signals; detecting cardiac cycle durations that may be based upon the first and second detection signals; detecting electrocard

Abstract: A method that includes receiving, by a computerized device, first detection signals generated as a result of an illumination, by infrared pulses, of a current portion of a sternum of a user; receiving, by the computerized device, second detection signals generated as a result of an illumination, by visible light pulses, of the current portion of the sternum of the user; and evaluating, by the computerized device, a quality of the first and second detection signals; and determining whether the current portion of the sternum of the user is the sternal angle of the user; wherein the determining is responsive to the quality of the first and second detection signals.