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 +2  (nbme20#37)

No one here bothered to actually discuss what's going on. This is a 1-month old newborn.

He vomits after feedings, 5-day history.

At 1 month old, with vomiting after feedings, it is most likely a case of PYLORIC STENOSIS due to hypertrophy of the pyloric sphincter (usually occurs 6 weeks later).

Due to him vomiting stomach contents, he will LOSE Cl-, K+, and Na+.

He will ALSO lose H+. This is why you go into the metabolic alkalosis with a resultant increase in the HCO3-.

kamilia20  sketchy:: vomiting causes loss of WATER greater than sodium→ increased serum sodium→ INCREASED serum osmolality, So NA will decrease too, but no that far

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