The nurse is reviewing laboratory results for a group of patients. Which value should be of most concern to the nurse?

Sodium level 140 mEq/L (136-145 mEq/L)

Magnesium level 1.0 mEq/L (1.3-2.1 mEq/L)

Calcium level 10 mg/dL (9-10.5 mg/dL)

Potassium level 3.5 mEq/L (3.5-5 mEq/L)

Answer and Explanation

The Correct Answer is B

A. Sodium level 140 mEq/L (136-145 mEq/L): This sodium level is within the normal range and is not of concern.

B. Magnesium level 1.0 mEq/L (1.3-2.1 mEq/L): This value is below the normal range, indicating hypomagnesemia, which can cause serious complications such as arrhythmias, neuromuscular irritability, and seizures. This is the most concerning value.

C. Calcium level 10 mg/dL (9-10.5 mg/dL): This calcium level is within the normal range and is not concerning.

D. Potassium level 3.5 mEq/L (3.5-5 mEq/L): This potassium level is at the low end of normal. While it is something to monitor, it is not immediately concerning compared to hypomagnesemia.

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Correct Answer is C

Explanation

A. Hypercalcemia: Hypercalcemia may cause confusion but is less likely associated with dehydration.

B. Hypomagnesemia: This can cause neuromuscular symptoms but is less commonly linked to confusion in dehydration.

C. Hyponatremia: Low sodium levels disrupt brain cell function, leading to confusion and neurological symptoms, which are common in dehydrated older adults.

D. Hypernatremia: While dehydration may cause hypernatremia, it is less likely to present with confusion in this context compared to hyponatremia.

A. Weak pulse B. Distended neck veins C. Bradycardia D. Pitting Edema

Correct Answer is A

Explanation

A. Weak pulse: Isotonic fluid-volume deficit results in decreased blood volume, leading to reduced cardiac output and a weak, thready pulse.

B. Distended neck veins: This is associated with fluid volume excess, not deficit.

C. Bradycardia: Fluid deficit typically leads to tachycardia as the body compensates for decreased circulating volume.

D. Pitting edema: This is a sign of fluid overload rather than deficit.

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