Diuretic use can cause a metabolic alkalosis due to decreases in total volume with minimal change in bicarbonate levels which leads to a relative increase in the concentration of bicarbonate. Alkalosis can also result due to renal compensatory mechanisms used to correct volume loss, which leads to increased bicarbonate reabsorption in the kidney. This is referred to as contraction alkalization.
Vomiting causes alkalosis due to depletion of volume as well as loss of HCl from vomiting stomach acid.
Excess antacid use can lead to alkalosis as the bicarbonate binds acid in the gut lumen, allowing extra bicarbonate to be reabsorbed in the stomach.
Hyperaldosteronism can be caused by a variety of etiologies such as aldosterone secreting tumors or renal artery stenosis and results in bicarbonate resorption.
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