If a patient develops pulmonary edema after administration of contrast media and does not respond to conservative treatment, which emergency medication can be administered intravenously?

The administration of furosemide, a loop diuretic, is the correct choice in this scenario due to its effectiveness in treating pulmonary edema, particularly when the condition does not improve with conservative measures. Furosemide works by promoting diuresis, which helps to remove excess fluid from the body, thereby reducing the fluid accumulation in the lung tissue that is characteristic of pulmonary edema.

In situations where pulmonary edema occurs after contrast media administration, the primary concern is rapidly addressing the build-up of fluid in the lungs to alleviate respiratory distress. Furosemide acts quickly to diurese and can be administered intravenously for prompt action, making it especially useful in emergency settings.

Other options do not have the same direct application for treating pulmonary edema. Mannitol is used primarily for conditions like cerebral edema and to decrease intracranial pressure, rather than for pulmonary-related issues. Amlodipine is a calcium channel blocker used for hypertension and angina, and does not address fluid overload. Metoprolol, a beta-blocker, is used for managing heart conditions and is not indicated for treating fluid accumulation in the lungs.

Thus, furosemide is the preferred intravenous medication in this context due to its strong diuretic properties,