<prompt> The pressure used in pneumatic tourniquet in upper limb is upto:Systolic Blood Pressure 50Systolic Blood Pressure 75Systolic Blood Pressure 100None of the above  <response>: Pneumatic tourniquet is a narrow rubber bag to be wound around a limb, pressure being applied by pumping air into the inflatable cuff.A bloodless field is obtained by applying pressure through pneumatic tourniquet for accurate surgery. Usually pressure applied 75 mmHg over systolic blood pressure for not more than 2 hours. 