Medical monitoring analysis and replay including indicia responsive to light attenuated by body tissue

A method of replaying historical physiological parameters of a patient on a display device of a patient monitor, the patient monitor comprising one or more processors configured to analyze measured values of a plurality of physiological parameters of the patient in real time and store the measured values for replay, the method comprising:

• using the one or more processors:
• receiving a first user input to select a replay display rate, wherein the replay display rate is dynamically adjustable by the user during replay and comprises a sampling interval of the stored measured values;
• setting a beginning of a replay time period;
• accessing the measured values at the beginning of the replay time period stored at the patient monitor;
• replaying the measured values of the plurality of physiological parameters synchronously on the display device from the beginning of the replay time period to a current display time at the replay display rate, wherein replaying the measured values comprises selecting and displaying only those stored measured values corresponding to the sampling interval;
• and
• repeatedly accessing additional measured values at a new beginning time and replaying the plurality of physiological parameters at the new beginning time until playback has reached an end of the replay time period,
• wherein the new beginning time is calculated by adding the replay display rate to the current display time.