Blood pressure is one of the vital parameter to assess the condition of the patient. Blood pressure needs to be monitored continuously in many cases such as malignant Hypertension etc. Blood pressure being a dynamic parameter is never constant varies due to Age, Sex, Diurnal variations. At present there are different methods to estimate blood pressure such as palpatory, auscultatatory methods. In these methods the cuffs have to be tied around the artery whose BP has to be estimated. Tying cuffs cannot be used for long time recordings. Hence the necessity of a non-invasive B.P monitoring system. The literature review done shows BP can be estimated non-invasively by different methods such as Volume oscillometry method, Volume compensation etc.
