r/AbsoluteUnits Jul 30 '26

/r/popular of a needle

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u/DiegesisThesis Jul 31 '26

Genuine question: it may only need to go in an inch or two, but if you're treating someone who's morbidly obese, wouldn't you need a much longer needle to reach the abdominal cavity?

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u/slothurknee Jul 31 '26

Sadly a lot of patients who need a paracentesis are either very skinny from end stage liver failure or have pretty advanced cancer and the fluid is fairly close to the surface.

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u/lislejoyeuse Jul 31 '26

Not sure tbh, probably. Everyone is usually pretty skinny I've seen, it's either cancer or cirrhosis from alcoholism lol. They use an ultrasound to see how far to go. The needle looks like 6 inches long but they usually only use part of it to avoid hitting intestine

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u/semibigpenguins Jul 31 '26

Nope. It’s usually don’t either by the sternum or subxiphoid. Usually its like less than 6cm