A client is hospitalized for observation after suffering heat exhaustion during a marathon race. He complains of dizziness when he stands up, and the RN determines that he has postural hypotension. Based on the information, which of the following electrolyte imbalances could cause the client's symptoms?

Choice A reason: Weight-bearing exercise, such as walking, jogging, or dancing, helps to strengthen the bones and prevent osteoporosis. It also improves muscle strength, balance, and coordination, which can reduce the risk of falls and fractures.

Choice B reason: Having a bone density scan every year is not necessary for a young adult client who has a family history of osteoporosis. A bone density scan is a test that measures the amount of calcium and other minerals in the bones. It is usually recommended for women over 65 years old, men over 70 years old, or people who have risk factors for osteoporosis, such as low body weight, smoking, or steroid use.

Choice C reason: Taking a magnesium supplement every day is not a proven way to prevent osteoporosis. Magnesium is a mineral that is involved in bone formation and metabolism, but there is not enough evidence to support its role in preventing or treating osteoporosis. A balanced diet that includes foods rich in calcium, vitamin D, and other nutrients is more effective for bone health.

Choice D reason: Drinking a cup of coffee every morning is not a good idea for a young adult client who has a family history of osteoporosis. Coffee contains caffeine, which can interfere with the absorption of calcium and increase the excretion of calcium in the urine. This can lead to lower bone density and higher risk of osteoporosis. Moderate coffee consumption (one or two cups per day) may not have a significant effect on bone health, but excessive coffee intake (more than four cups per day) should be avoided.

Choice A reason: Fluid volume deficit is a condition in which the body loses more fluid than it gains, resulting in dehydration, hypotension, and electrolyte imbalances. It is not a complication of IV fluid therapy, but rather a reason for initiating it.

Choice B reason: Fluid volume excess is a condition in which the body retains more fluid than it needs, resulting in edema, hypertension, and heart failure. It is a potential complication of IV fluid therapy, especially in older adults who have reduced renal function and cardiac output. The nurse's assessment findings of crackles, shortness of breath, and jugular vein distention are indicative of fluid overload and pulmonary congestion.

Choice C reason: Speed shock is a systemic reaction that occurs when a substance is administered too rapidly into the bloodstream, causing adverse effects such as chest pain, dyspnea, hypotension, and cardiac arrest. It is not a complication of IV fluid therapy, but rather a risk associated with IV medication administration.

Choice D reason: Pulmonary embolism is a blockage of one or more pulmonary arteries by a blood clot, fat, or air, causing impaired gas exchange, chest pain, dyspnea, and hemoptysis. It is not a complication of IV fluid therapy, but rather a possible outcome of venous thromboembolism, which can be prevented by using anticoagulants and mechanical devices.