In the case of a 20-year-old male with blurred vision and difficulty breathing, what action should you take?

In this scenario, where a 20-year-old male is experiencing blurred vision and difficulty breathing, assisting his ventilations is crucial. Difficulty in breathing can indicate a compromised airway or respiratory distress, and ensuring adequate ventilation is essential in maintaining oxygen delivery to vital organs.

Assisting ventilations with high-flow oxygen helps to effectively support the patient's respiratory function. This action addresses both the immediate need for oxygenation and the potential for respiratory failure, as the patient's symptoms suggest significant distress.

Additionally, while high-flow oxygen can temporarily alleviate some symptoms, it is also appropriate to monitor respiratory effort and consider the need for further interventions based on the patient's condition. This immediate support can stabilize the patient until further medical help arrives or additional treatments can be initiated.

In contrast, applying oxygen via a nonrebreathing mask may provide oxygen but does not assist with inadequate breathing. Positioning the patient supine and elevating the legs may be beneficial in certain scenarios, but in this case, it does not address the immediate respiratory distress. Requesting a paramedic to administer atropine is typically used for bradycardia or specific types of poisonings and is not the first action to take with the given symptoms of blurred vision and difficulty breathing.