Modelling patient responses to surgical procedures during endoscopic sinus surgery using local anesthesia

We have constructed a patients´ response model during endoscopic sinus surgery using local anesthesia. During this surgery, the patient keeps a high level of consciousness, and feels pressure, vibration and pain from the surgical procedures. These feelings affect the patient´s mental and physiological condition, and the excessive fluctuation of patient´s condition interrupts the surgery. Therefore, awareness of the patient´s condition and control of them are important to the surgeon. With this in view, we are constructing a model that can represent the patient´s mental and physiological responses. To develop the model, the causal relationship between surgical procedures and patient´s responses was investigated. It becomes clear that the patient´s response is dependent on the pattern of the procedure sequence, the length of the procedure and the effects resulting from the procedure such as vibration and pain. We constructed a model of these behaviors using the Bayesian network.