An older adult client enjoys good overall health, but has just been diagnosed with pneumonia and has begun receiving an intravenous (IV) antibiotic. Shortly after being administered the first dose, the client pulled out his IV line and is now attempting to scale his bed rails. Which of the following phenomena most likely underlies this change in the client's cognition

The provided question is incomplete as there is no required options are available, however the option are as follows:

1. Dementia

2. Depression

3. Disorientation

4. Delirium

Answer:

The correct answer is delirium.

Explanation:

Delirium is alteration of the part of the brain that result in temporary effects in the brain such as mental confusion or emotional disturbance in brain. This case can be arise by the new effect of the drug or interaction of the drug to the brain.

In this case one can experience lack of paying attention, loosing temporary memory and many other condition.

Thus, the correct answer is - delirium.