Patent ID: 7811247

Claim:
An arrangement for monitoring a dosing of a medication administered to a patient, the arrangement comprising: an apparatus for administering the medication to said patient; said apparatus including a device for detecting the quantity of said medication delivered to said patient; a device for measuring the concentration of said medication in the breathing gas of said patient; an evaluation unit for detecting a deviation of the concentration of said medication measured in said breathing gas from a first concentration range having upper and lower limits and being narrower than a second concentration range adjustable by an operator or by said evaluation unit; said evaluation unit being adapted to determine the upper and lower limits of said first concentration range in accordance with a pharmacokinetic model based on the quantity of said medication delivered to the patient; and, an alarm unit connected to said evaluation unit for outputting an alarm announcement when said concentration of said medication measured in said breathing gas passes out of said first concentration range thereby providing an indication of a possible malfunction in said arrangement earlier than when said concentration passes out of said second concentration range.