Final answer:
The nurse should expect manifestations of hyponatremia in a client with diarrhea and vomiting and a sodium level of 124 mEq/L. These manifestations may include orthostatic hypotension and muscle twitching due to electrolyte imbalances caused by the low sodium levels.
Step-by-step explanation:
The nurse should expect manifestations of hyponatremia in a client with a sodium level of 124 mEq/L who is experiencing diarrhea and vomiting. These manifestations may include orthostatic hypotension, as low sodium levels can lead to decreased blood volume and circulatory failure. Other manifestations may include muscle twitching, as an abnormal loss of sodium from the body can result in electrolyte imbalances.