Trick of the Trade: Unblock the Obstructed IV line
Flush the line with a smaller (3 cc) syringe
Do you remember Pascal’s Principle from your high school physics class? I vaguely recall it, but never thought it’d be of clinical importance. Thanks to Dr. Matt Silver (San Diego Kaiser Permanente Medical Center) for this tip, which also applies to flushing any clotted peripheral line.
Use a saline filled 3 cc syringe to flush the line. Generally, it takes very little force on the plunger. No need for a heparin flush. No need for diluted thrombolytic.
Pascal’s principle explains the physics behind it. You’d think that a larger syringe would transmit greater force. Not true… a small-volume syringe exerts greater pressure per force applied to the plunger than a larger syringe. If it doesn’t work after positional maneuvers and a 3cc flush, the line is likely unusable.
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