Which electrolyte imbalance can result from excessive vomiting?

• A. Hypernatremia
• B. Hypokalemia
• C. Hypercalcemia
• D. Hypomagnesemia

Answer: (B)

Excessive vomiting can lead to hypokalemia, which is a condition characterized by low levels of potassium in the blood. When a person vomits, not only do they lose stomach acid (hydrochloric acid), but they also lose large amounts of potassium, which is primarily stored inside cells and is vital for many physiological functions, including maintaining normal muscle function and heart rhythm.

The loss of potassium occurs because gastric secretions contain a significant amount of this electrolyte. As vomiting continues, the body may struggle to replace the lost potassium, leading to a depletion in the bloodstream. Symptoms of hypokalemia can include muscle weakness, cramping, fatigue, and heart arrhythmias.

In contrast, the other options reflect disorders that are less directly associated with excessive vomiting. Hypernatremia, for instance, usually arises from water loss or an excessive intake of sodium. Hypercalcemia refers to elevated calcium levels, and hypomagnesemia involves low magnesium levels, neither of which are directly caused by vomiting. Thus, hypokalemia is the most relevant electrolyte imbalance resulting from excessive vomiting.