00:00
So there are 2 consequences.
00:02
Now, what we’ll do is
we’ll go to the verbiage
of things we already have
discussed with you now.
00:07
There are two consequences of
decreased alpha globin production.
00:10
What are they?
Decreased hemoglobin synthesis,
microcytic hypochromic anemia.
00:17
But we are not touching what
component of hemoglobin?
Good. The heme.
00:23
So what about your iron studies?
Normal.
00:26
Only thing that is affected,
the globin, the alpha.
00:30
The quantitative imbalance, right
now, you pay attention here.
00:34
I’m going to walk you through
three alleles once again.
00:37
If three alleles are missing,
it’s not silent, it's not trait,
But what is your body trying to do?
Compensate.
00:43
Three alleles are missing.
00:47
My body is desperate, desperate,
desperate as some kind of hemoglobin.
00:49
So what is it going to do?
Oh, maybe it’s producing
too much beta globin.
00:53
So an aggregate of four beta
will then give you an --
you need to memorize this.
00:58
Keep going over and
over and over.
01:01
In that table, I showed
you HbH and here’s beta.
01:06
If by chance the body is
trying to now form more gamma,
you’ll have to memorize that
this is hemoglobin Bart’s.
01:13
And these are all different
types of hemoglobins.
01:15
So now, how would you confirm
hemoglobin H disease?
You confirm it hemoglobin electrophoresis.
01:22
You see that’s going to give you
completely different pattern, isn't it?
Because it’s not A, it’s not A2,
and it’s definitely not F
and it's really not even S.
01:31
So that will become important for you
when you’re missing at least three,
quantitative imbalance.
01:35
Now, these RBCs over a
period of time, remember,
this hemoglobin is rather
bizarre in your RBC.
01:43
The RBC is now what?
Looked at as being an invader.
01:47
It will then be cleared by the spleen and
so therefore it only makes it worse.
01:50
In over a period of time, well you tell me,
if the more number of
RBCs that you destroy,
what are you undergoing?
What’s this process called?
Normally in an adult, where are
your myeloid cells being produced?
In your bone marrow.
02:05
What bones?
Sternum, good.
02:08
Ribs, good.
02:09
Humerus, yeah.
02:11
But what if that isn’t enough
because there is chronic anemia?
Then it’s called extramedullary
hematopoiesis, isn't it?
So you’re going to move
away from those bones
and maybe other bones are
going to get affected.
02:23
Maybe the suture's in the head.
02:26
And if they are being called
upon to recruit more RBCs,
what do you think
happens to the bone?
The sutures get bigger
and the frontal bone
is then going to--
what’s that called clinically
when it’s protruding forward?
It’s called frontal bossing, right?
Frontal bossing.
02:42
Good. Keep those things in mind
and understand the concept of
extramedullary hematopoiesis.
02:47
A lot more detailed but important.
02:48
My goodness, yes,
so you can distinguish between
silent and trait and three.
02:52
What about four?
As I told you, intrauterine death.