A nurse is providing instruction to a new nurse about caring for clients who are receiving diuretic therapy to treat heart failure. The nurse should explain that which of the following medications puts clients at risk for both hyperkalemia and hyponatremia?

A) Flushed skin: Flushed skin is not typically associated with hyponatremia. Instead, hyponatremia may present with symptoms such as pallor or cool, clammy skin due to alterations in perfusion and fluid balance.

B) Fever: Fever is not a common manifestation of hyponatremia. Elevated body temperature is typically associated with conditions such as infection or inflammation rather than electrolyte imbalances like hyponatremia.

C) Nausea and vomiting: Hyponatremia, defined as a serum sodium level below 135 mEq/L, can lead to neurological symptoms, including nausea and vomiting. These symptoms occur due to alterations in osmotic pressure and cellular swelling resulting from the relative excess of water compared to sodium in the extracellular fluid. Other neurological symptoms of hyponatremia can include headache, confusion, lethargy, and seizures.

D) Extreme thirst: Extreme thirst, or polydipsia, is more commonly associated with hypernatremia, which is characterized by a serum sodium level above 145 mEq/L. Hypernatremia results from dehydration or a deficit of body water relative to sodium, leading to increased thirst as the body attempts to restore fluid balance.

A) Bright light: Exposure to bright light, especially in the evening or at night, can interfere with the body's production of melatonin, a hormone that regulates the sleep-wake cycle. Bright light exposure can disrupt circadian rhythms, making it more challenging to fall asleep and stay asleep.

B) Drinking caffeinated beverages in the evening: Caffeine is a stimulant that can interfere with sleep by blocking the effects of adenosine, a neurotransmitter that promotes sleepiness. Consuming caffeinated beverages in the evening can delay the onset of sleep and reduce overall sleep duration.

C) A 20-minute nap during the day: While short naps can be beneficial for some individuals, especially if they are sleep-deprived, napping for too long or too late in the day can disrupt the body's natural sleep-wake cycle. Short naps can be refreshing, but longer or late-day naps can make it harder to fall asleep at night.

D) Emotional stress: Stress and anxiety can trigger the body's "fight or flight" response, leading to increased alertness and difficulty relaxing or falling asleep. Chronic stress can disrupt the sleep-wake cycle, leading to difficulty initiating or maintaining sleep and resulting in poor sleep quality.

E) A regular bedtime schedule: Having a consistent bedtime schedule can actually help regulate the sleep-wake cycle by reinforcing the body's internal clock. Going to bed and waking up at the same time each day, even on weekends, can help improve sleep quality and make it easier to fall asleep and wake up naturally.