Why is there aciduria in pyloric stenosis?
The kidneys attempt to maintain normal pH by excreting excess HCO3. The kidneys attempt to conserve sodium at the expense of hydrogen ions, which can lead to paradoxical aciduria. In more severe dehydration, renal potassium losses are also accelerated owing to an attempt to retain fluid and sodium.
What is Paradoxic aciduria?
Abstract. Paradoxical aciduria typically occurs as a result of metabolic alkalosis and intrinsic mechanisms to correct acid-base imbalances. It most commonly develops in the setting of pathologies which result in excessive gastric acid losses and is often associated with severe metabolic derangements.
Why is there paradoxical aciduria in gastric outlet obstruction?
HCO3 is excreted with Na and K until the overall volume deficit triggers an expansion of the extracellular volume rather than maintenance of pH. Na is resorbed, but K is lost via an aldosterone mediated mechanism and this leads to excretion of H ion resulting in “paradoxical aciduria” in an alkalotic patient.
Why does hypokalemia occur in pyloric stenosis?
ELECTROLYTE ABNORMALITIES Pyloric stenosis usually results in metabolic alkalosis with associated hypochloremia and hypokalemia due to a loss of hydrogen and chloride ions from vomiting gastric contents. However, if the dehydration is severe enough, paradoxical aciduria may occur.
How is paradoxical aciduria treated?
To rectify the whole situation, the patient must be volume-resuscitated by isotonic saline to decrease the activity of the renin-angiotensin-aldosterone axis. Supplemental KCl is administered to restore the potassium concentration to normal.
What is paradoxical alkaline urine?
This aciduria, referred to as “paradoxical aciduria” when a metabolic alkalosis is present, develops consequent to secretion of a hydrogen ion in the distal nephron when a sodium ion is reabsorbed to replenish the volume of extracellular fluid.
How do you fix paradoxical aciduria?
What electrolyte imbalance occurs in gastric outlet obstruction?
The classic electrolyte disorder of patients with long-standing gastric outlet obstruction is a hypochloremic, hypokalemic metabolic alkalosis.
Why is Ringer lactate contraindicated in pyloric stenosis?
Lactated Ringer solution is contraindicated because it may exacerbate the metabolic alkalosis.
How is a pyloromyotomy performed?
In surgery to treat pyloric stenosis (pyloromyotomy), the surgeon makes an incision in the wall of the pylorus. The lining of the pylorus bulges through the incision, opening a channel from the stomach to the small intestine.
What is pyloromyotomy surgery?
Pyloromyotomy. In surgery to treat pyloric stenosis (pyloromyotomy), the surgeon makes an incision in the wall of the pylorus. The lining of the pylorus bulges through the incision, opening a channel from the stomach to the small intestine. Surgery is needed to treat pyloric stenosis.
What is Hypochloremic alkalosis?
Hypochloremic alkalosis results from either low chloride intake or excessive chloride wasting. Whereas low chloride intake is very uncommon, excessive chloride wasting often occurs in hospitalized children, usually as a result of diuretic therapy or nasogastric tube suctioning.
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