Which statement regarding dehydration in older adults is NOT true?

The statement regarding dehydration in older adults that is not true is that the use of diuretics leads to hypertonic dehydration. Hypertonic dehydration typically occurs when there is a loss of water without a proportional loss of electrolytes, leading to an increase in serum osmolality. While diuretics do increase fluid loss, resulting in dehydration, they primarily cause isotonic or hypotonic dehydration rather than hypertonic dehydration.

The effects of diuretics can lead to a loss of both water and electrolytes, depending on their mechanism of action. Hence, it is important to note that the connection between diuretics and hypertonic dehydration is not accurate. Instead, the primary concern with diuretics is the potential for an imbalance in electrolytes and overall fluid volume.

In contrast, older adults do experience a blunted thirst mechanism, which can significantly increase their risk of dehydration. Additionally, increased body fat does reduce the total body fluid percentage since fat tissue accounts for less water than lean muscle mass. Furthermore, decreased renal function in older adults impairs fluid retention, making the accurate management of hydration essential for this population.