A Patient Is Hospitalized with Possible SIADH

question 2

Multiple Choice

A patient is hospitalized with possible SIADH. The patient is confused and reports a headache, muscle cramps, and twitching. The nurse would expect the initial laboratory results to include a

• A) serum sodium of 125 mEq/L (125 mmol/L).
• B) hematocrit of 52%.
• C) blood urea nitrogen (BUN) of 22 mg/dl (11.5 mmol/L).
• D) serum chloride of 110 mEq/L (110 mmol/L).

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Definitions:

E(XY)

The expected value of the product of two random variables X and Y, indicating their joint mean over all pairs of outcomes.

Marginal Probability

The probability of an event occurring, regardless of the outcomes of other variables; it is calculated by summing the probabilities of the event across all values of the other variables.

E(X + Y)

The expected value of the sum of two random variables, equal to the sum of their individual expected values.

Covariance

A measure that indicates the extent to which two variables change together, but does not indicate the strength of their relationship.