What is the effect of IV 3% saline in the treatment of increased ICP?

The administration of IV 3% saline is primarily used in the management of increased intracranial pressure (ICP) due to its hyperosmolar properties. When hypertonic saline is infused, it creates an osmotic gradient that effectively draws water out of the brain tissue and into the intravascular compartment. This shift of fluid helps to reduce cerebral edema and ultimately leads to a decrease in ICP.

The use of hyperosmolar solutions like 3% saline helps achieve and maintain a hyperosmolar state in the intravascular compartment. This not only aids in reducing the volume of fluid in the brain but also enhances intracranial perfusion, which is crucial in critical care settings.

The other options do not accurately describe the effects of 3% saline in this context: it does not reduce blood pressure as a primary action; it is intended to decrease, not increase, ICP; and it does not normalize blood glucose levels, as its main role is related to fluid management and osmolarity rather than glucose metabolism. Thus, the option that highlights the effect of making the intravascular compartment hyperosmolar is the correct choice.