As these patient are often hypoxemic and acidotic, respiratory alkalosis can be induced as a temporizing measure, until the drug of choice sodium bicarbonate (Class IIa) can be used.
So in order to help compensate for an alkalosis, hydrogen ions leave cells and potassium ions enter the cells and leave the blood, resulting in hypokalemia.
The purging involved in bulimia can also cause a depletion of electrolytes which leads to a low level of sodium, chloride, magnesium, phosphate, and potassium, as well as a general metabolic alkalosis.
Another cause of an internal potassium balance shift could be an alkalosis, which is when the blood becomes too alkaline, in other words, there’s a lower concentration of hydrogen ions —meaning a higher blood pH.