The study is aimed at comparing peripherial venous pressure as an indicator of central venous pressure in post operative surgical patients.

Inclusion Criteria:

• ASA I/II/III surgical patients who require central venous access as part of their surgical treatment plan with no organ support in post operative period.
• Age between 18 and 75 years
• Who have atleast 1 x 18 gauge peripherial venous cannula in the upper limb from elbow below to the hand
• Who have given consent

Exclusion Criteria:

• Not meeting the inclusion criteria