PKU is the most common amino acid disorder Metabolic acidosis. Hyperammonemia
Oct 13

Normally there is zero homocystine in the plasma. So this is easy to make the diagnosis, as long as the sample gets to the lab properly. It has to be placed on ice and has to be spun down within an hour or two. Because this is an unstable compound and if you let it sit out on the lab bench or you stick it in the mailbox you are not going to see this. This peak here is methionine. It’s normally high because of the metabolic block, and then when you treat with betaine it goes even higher.
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Metabolic diseases of the newborn. We are talking about 1:10,000, 1:100,000. So individually all these disorders are rare, but you put them all together and they are a formidable enemy and have to be dealt with, and suspected. The symptoms are non-specific because babies only do so many things. Bear in mind that if you delay the diagnosis in some of these disorders you may have allowed to occur irreversible damage. So it is paramount to diagnose these disorders as soon as possible because you may be able to do something about them. When do we suspect an acute metabolic disease in infancy? First of all, gather a little family history. You may possibly generate a family history where there have been some neonatal deaths. These kids usually appear healthy in the immediate newborn period but then may gradually develop symptoms over the first week or so of life. They may become anorectic, they may start vomiting, they may have lethargy. This can progress, in some conditions, all the way to coma in the matter of a few days. They may seizures, they may have funny odors, they may have ketones in their urine, they may have altered acid/base status, such as metabolic acidosis.
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So let’s look at the common tests because you may have some clues there as to what might be going on. For example, you can look at a CBC. If the child has neutropenia or thrombocytopenia this might be a clue that the child has methylmalonic aciduria, or propionic aciduria. If the child is spilling ketones, or not spilling ketones, that may lead you down a certain pathway, which I’ll show you in a minute. Look at their glucose. If they are hypoglycemic then they may have a defect in beta oxidation, or they may have a glycogen storage disease. So these are all very simple, very cheap, readily available tests and please don’t forget ammonia, because that is very useful and you would hate to miss an infant with hyperammonemia.

One Response to “Biochemical disorders. Metabolic diseases”

  1. There was a treatment touted a few years ago Says:

    [...] You really don’t have much affect on the CNS and that’s very often the case in many of these metabolic disorders which affect the central nervous system. You can make them look better on paper if you are [...]

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