Drug administration controller

1. A drug administration method comprising:

measuring at least one physiological parameter with a noninvasive optical sensor attached to a patient;

deriving at least one parameter trend for each measured physiological parameter, the trend indicating if the at least one parameter for each measured physiological parameter is increasing or decreasing at a certain rate over a certain time; and

controlling a drug administration device based at least on one of the at least one parameter trends,

wherein the at least one physiological parameter includes perfusion index.

2. The drug administration method according to claim 1 further comprising deriving at least one parameter limit, parameter pattern and a parameter variability.

3. The drug administration method according to claim 1 wherein controlling comprises enabling the drug administration device when perfusion index is trending downward as a marker of pain stimulus.

4. The drug administration method according to claim 1 wherein controlling further comprises pausing the drug administration device when perfusion index is not trending downward.

5. The drug administration method according to claim 1 wherein the at least one physiological parameter includes HbMet and wherein controlling comprises pausing the drug administration device when HbMet is trending upward.

6. The drug administration method according to claim 1 further comprising deriving a parameter limit and wherein the at least one physiological parameter includes HbMet and controlling comprises pausing the drug administration device when HbMet is above HbMet limit.

7. The drug administration method according to claim 1 comprising measuring respiration rate with a noninvasive sensor attached to a patient and deriving a respiration rate trend, wherein controlling comprises pausing the drug administration device when said RR trend is trending downward.

8. The drug administration method according to claim 1 comprising measuring RR with a noninvasive sensor attached to a patient wherein controlling comprises pausing the drug administration device when respiration rate is less than a respiration rate limit.

9. The drug administration method according to claim 1 wherein the at least one physiological parameter includes HbCO.

10. The drug administration method according to claim 1 comprising measuring oxygen saturation with a noninvasive sensor attached to a patient wherein controlling comprises pausing the drug administration device when a number of cyclical desaturations over a given timeframe is greater than a predetermined threshold.

11. A drug administration controller comprising:

at least one noninvasive optical sensor that generates at least one sensor signal in response to a physiological state of a living being;

at least one physiological measurement device that generates measurements of at least one physiological parameter in response to the at least one sensor signal, said at least one physiological parameter including perfusion index;

a rules-based processor that generates a control output in response to at least trends of the physiological parameter measurements, the trends indicating if the physiological parameter measurements are increasing or decreasing at a certain rate over a certain time; and

a drug administration device responsive to one or more control outputs so as to affect the treatment of the living being including at least one of initiating, pausing, halting or adjusting the dosage of administered drugs.

12. The drug administration controller according to claim 11 wherein the drug administration device is one of a drug infusion device and a medical gas inhalation device.

13. The drug administration controller according to claim 12 wherein the at least one sensor comprises:

the optical; and

a sound sensor attached proximate to a neck site so as to measure respiration rate.

14. The drug administration controller according to claim 11 wherein the at least one blood parameter comprises at least one of HbMet and HbCO.