Wire Patency is not Catheter Patency

Wire patency is not catheter patency.

A 28-year-old woman. Acute cholangitis. Acute pancreatitis. Jaundice, elevated liver tests, a lower CBD obstructing stone on CT. The indication was never in question - she needed the duct decompressed, urgently.

The guidewire crossed the papilla, curled into the CBD on fluoro. Path confirmed.

Then I pushed the sphincterotome. And it stopped.

Not angulation. Not a loop. Not a false tract.

The stone itself, sitting directly in the papillary roof.

The wire is thin. It threaded around the impaction the way a path threads around a boulder. The sphincterotome is not thin - it has caliber, a bow, a cutting wire. It could not follow where the wire went, because the space the wire used was never a channel. It was a gap.

So I loaded the big wheel up, and pushed.

Not force for force's sake - sustained, directed pressure. The same sensation as a scope crossing a tight cardia in achalasia. Resistance, then a give. A pop. The stone didn't move aside. It gave way, because the pressure had nowhere left to go but through it.

The sphincterotomy ran straight onto the impaction. The stone fractured in two, right at the wire, mid-cut.

One motion. Two jobs. Sphincter divided. Stone fragmented. Duct decompressed - in a young woman whose cholangitis and pancreatitis both trace back to the same few millimeters of obstruction.

No separate lithotripsy pass needed. The obstruction was already sitting exactly where the blade, and the pressure, were going.

The lesson isn't technical. It's conceptual.

Wire success and catheter success are two different questions. The wire asks: does a path exist? The catheter asks: is that path open? Resistance is the anatomy answering the second question - and sometimes, like a cardia in achalasia, the answer isn't "no." It's "not yet, until you commit."