Final answer:
An intravenous addition of sodium is used to treat hyponatremia and related conditions like hypervolemia, as well as to manage hypertensive crises and high blood pressure in heart failure patients.
Step-by-step explanation:
An intravenous addition of sodium can be used to treat conditions like hyponatremia, which is a lower-than-normal concentration of sodium in the blood, often associated with excess water accumulation that dilutes the sodium. Correction for this condition sometimes involves an IV drip that administers NaCl solution or a mixture of isotonic saline and Na lactate, especially when the sodium and bicarbonate losses are significant.
It's also applicable in the treatment of conditions such as hypervolemia and hypertensive crises to assist in lowering blood pressure and mitigating risks associated with heart failure, water retention related to edema, or congestive heart failure.