A technique to prevent overfilling of viewing chamber of int
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In certain patients, peripheral venous access is possible only in one limb, and the blood pressure (BP) cuff can only be placed on this limb because the other limbs are being operated upon or are splinted. Inflation of the BP cuff on this limb leads to back flow of fluid/blood through the transfusion tubing leading to complete filling of the viewing chamber of the infusion kit, thereby limiting its utility.We describe a technique that prevents overfilling of the viewing chamber. It requires an air free collapsible fluid bag and will not work with bottles. After filling the viewing chamber with sufficient fluid, the fluid bag is hung on the stand in an upside down manner using towel clip. The viewing chamber is pasted onto the side of the fluid bag using micropore tape (3MTM). Upon starting the infusion, when the BP cuff inflates, fluid in the infusion tubing moves up the tube to fill the viewing chamber. Air in the viewing chamber gets pushed to the top of the inverted fluid bag. With cuff deflation, the infusion starts again. The air that was pushed into the bag moves back into the viewing chamber. The air-fluid interface in the viewing chamber and its visual utility is maintained. The entire fluid can be transfused without obscuring the vision in the viewing chamber due to fluid filling caused by repetitive inflation of the BP cuff. The viewing chamber need not be emptied repetitively to maintain vision. Dextrose containing fluids should be avoided with this technique. Mixing of blood with dextrose causes clumping and possible clot formation every time blood ascends up the tubing...

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