Which electrolyte imbalance is commonly seen in patients with Conn's syndrome?

Conn's syndrome, also known as primary hyperaldosteronism, is characterized by the excessive production of the hormone aldosterone by the adrenal glands. Aldosterone plays a crucial role in regulating electrolytes by promoting sodium reabsorption and potassium excretion in the renal tubules.

In patients with Conn's syndrome, the increased levels of aldosterone lead to retention of sodium, which often results in elevated sodium levels in the bloodstream, but more importantly, it causes increased excretion of potassium. This process results in hypokalemia, or low levels of potassium in the body. Symptoms of hypokalemia can include muscle weakness, fatigue, and arrhythmias.

Therefore, the common electrolyte imbalance associated with Conn's syndrome is hypokalemia, making it the correct answer in this context.