Final answer:
To assist a 25-year-old woman suffering from hyperventilation syndrome, one should calmly try to help her slow her breathing rather than having her breathe into a paper bag, which is no longer recommended.
Step-by-step explanation:
If a 25-year-old woman appears to be suffering from hyperventilation syndrome, the best immediate action is to C. try to calm the patient. Hyperventilation syndrome occurs when a person breathes at an abnormally rapid rate, which can lead to a decrease in carbon dioxide levels in the blood and result in various symptoms such as lightheadedness, tingling in the limbs, and chest pain. Assisting her in slowing her breathing can help restore carbon dioxide levels to normal. It is worth noting that previously, breathing into a paper bag was a common recommendation; however, this practice is no longer widely advised because of the risk of decreasing oxygen levels too much. Instead, it is recommended to encourage slow, controlled breaths without the use of the bag.