Which of the following are common causes and nursing considerations for fluid and electrolyte imbalances? (Select All that Apply.)

Fluid and electrolyte homeostasis depends on renal autoregulation, hormonal signaling, and capillary dynamics. Imbalances involve osmotic pressure shifts and voltage-gated channel disruptions, causing cardiac arrhythmias, neurological deficits, or lethal cellular dehydration when compensatory mechanisms fail. Rationale: A. Kidney failure typically leads to hyponatremia due to impaired water excretion despite total body sodium excess. In renal parenchymal disease, the kidneys lose the ability to concentrate urine, leading to dilutional effects rather than true primary hypernatremia. B. Excessive gastrointestinal losses through chronic diarrhea deplete intracellular and extracellular stores of potassium. This results in hypokalemia, often characterized by prominent U-waves on an electrocardiogram and potentially life-threatening paralytic ileus or skeletal muscle paralysis. C. Magnesium serves as a co-factor in enzymatic reactions and neuromuscular transmission regulation. Both hypermagnesemia and hypomagnesemia manifest with muscle weakness, though via different mechanisms involving acetylcholine release inhibition or altered resting membrane potentials. D. Myocardial infarction is a localized ischemic event causing necrosis of the cardiac muscle tissue. While it may lead to secondary electrolyte shifts during cardiogenic shock, it is not a primary cause or a nursing consideration for general imbalances. E. Profuse diaphoresis results in the loss of hypotonic fluid from the extracellular compartment. This insensible loss leads to dehydration, increasing serum osmolality and triggering the thirst mechanism alongside antidiuretic hormone release to conserve remaining water. F. Tachycardia is a hallmark sign of hypovolemia as the heart compensates for low stroke volume. In fluid overload, clinicians typically assess for distended neck veins, peripheral edema, and pulmonary crackles rather than identifying tachycardia as an initial indicator. G. Iatrogenic imbalances occur frequently when isotonic or hypotonic solutions are administered without serial labs. Rapid solute shifts can induce cerebral edema or osmotic demyelination syndrome, necessitating strict intake and output monitoring during parenteral therapy. H. Nutritional intervention is the primary nursing consideration for mild potassium deficits in stable clients. Consuming potassium-rich foods like bananas or avocados helps restore the intracellular cation balance without the risks associated with concentrated intravenous potassium boluses. I. Overhydration with free water or excessive intake leads to a relative deficit of sodium. This dilutional hyponatremia causes water to move into cells via osmosis, potentially resulting in cerebral swelling and altered mental status or seizures.