SIADH vs Diabetes Insipidus

What’s the difference between syndrome of
inappropriate antidiuretic hormone (or SIADH) and Diabetes Insipidus? I’m going to break it down really simple for
you so you can finally understand it for nursing school. Hey there friend, Christina here with
and this video is all about the difference between SIADH and diabetes insipidus. Now I want to mention, I do have a free cheat
sheet for you, it’s called the med-surg study checklist, so you can use it to help you study
for your med-surg classes and all of the disorders you need to learn, like SIADH and diabetes
insipidus. The link is down below in the description
for you to snag it. So SIADH and Diabetes Insipidus have to do
with a little hormone called ADH. And ADH stands for antidiuretic hormone. So antidiuretic hormone, or ADH, is exactly
what it sounds like, it’s an ANTI diuretic. And what do diuretics do? They make you urinate, a lot! So ADH, is ANTI-diuretic hormone, meaning
that you won’t urinate a lot. So it’s the reverse. When ADH is released into the body, it goes
and tells the kidneys to hold onto water, instead of urinating it out. So normally, when the body has a low fluid
volume (meaning, there isn’t enough water in the body), ADH is released from the posterior
pituitary gland and it tells the kidneys to hold onto more water, rather than sending
that water out into the urine. This will increase the fluid volume in the
body because the kidneys won’t be sending as much water out into the urine. Now, SIADH stands for syndrome of inappropriate
antidiuretic hormone. The name actually tells you what’s happening,
which is pretty nice. There is inappropriate antidiuretic hormone
being released, meaning the even when the body doesn’t need it, ADH is still being released. This is inappropriate ADH release, thus the
name. During SIADH, the posterior pituitary gland
releases ADH even if the fluid volume isn’t low. So even if the fluid volume in the body is
totally fine, there is still too much ADH being released. And this causes increased fluid volume in
the body and possibly fluid overload. So that’s what’s happening during SIADH: ADH
is being released inappropriately, even when it’s not supposed to. And ADH goes and tells the kidneys to hold
onto more and more water, which then causes the fluid volume to keep going up, possibly
leading to fluid overload. Now, the reverse of this is diabetes insipidus,
or DI for short. During diabetes insipidus, the posterior pituitary
gland does not release enough ADH, OR the kidneys don’t respond to it, either one of
those 2 causes. So during diabetes insipidus, there isn’t
enough ADH to start with, or the kidneys just don’t respond to it. Either way, there’s nothing to tell the kidneys
to HOLD ONTO water. So what are the kidneys going to do if there’s
nothing telling them to hold onto water? They are going to get rid of it! They’re going to send all of that water out
into the urine, and that’s exactly what’s happening during diabetes insipidus. The kidneys are getting rid of a lot of water
because they don’t have ADH telling them to hold onto it. This causes the fluid volume to get lower
and lower, because the kidneys keep getting rid of more and more water. And make sure to hit that like button, share this
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any future videos. Now become the nurse that God created only
you to be. I’ll catch you in the next video.

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