The study is prospective and descriptive it take place in the department of oral surgery in Tishreen university it concerned 32 patients presented a cardiovascular pathology having required an warfarine therapy and also need an act of oral surgery the objective of this study was to determine the INR value making possible to carry out an act of oral surgery without haemorrhagic risk we exploited the following parameters: identification of the patient, oral state, type of oral surgery, type of cardiopathy, AVK posology, INR value, means haemostasis. 56.25% of our patients had undergone a single extraction, 25% had beneficed multiple extractions and 18.75% had profited from surgical extraction the average value of the INR was 2.38 with an variance of 0.07 and an ecart type of 0.27. In favour of the haemostat means no haemorrhagic complication post operational was revealed it is allowed that the risk of thromboembolic accident by stoping the treatment is much more prejudicial than hemorrhagic risk for the patent.