Certified Registered Nurse Infusion (CRNI) Practice Exam 2026 - Free CRNI Practice Questions and Study Guide

The form of dehydration characterized by a greater loss of sodium than water is hypotonic dehydration. This condition occurs when the body loses a significant amount of sodium in relation to the amount of water lost. In hypotonic dehydration, the osmolarity of the body fluids decreases, leading to an imbalance where there is more water retained relative to sodium. This can result in various physiological effects, including cell swelling as water moves into cells to balance the osmolarity.

In contrast, isotonic dehydration involves equal losses of sodium and water, maintaining a balanced osmolarity. Hypertonic dehydration, on the other hand, occurs when water is lost at a greater rate than sodium, leading to an increase in osmolarity and often causing cells to shrink as water exits. Fluid overload does not pertain to dehydration; instead, it refers to an excess of fluid in the body, which can lead to different complications. Understanding these distinctions is crucial for recognizing the specific mechanisms and effects of different types of dehydration.