A system and method are provided for monitoring processes of an information technology system. Such stenosis typically results, in the absence of treatment, from trauma to a vessel, such as an incision, excessive pressure, an angioplasty procedure andor stent implantation. A sensor measures the oxygen or flammable gas near the tool and can operate in a first state to disconnect the energy source from the hand piece. Then, the respective values of particular ones of predetermined data units constituting the main information are subjected to arithmetic operations in accordance with a predetermined algorithm containing the value of each of the data pieces as a parameter.