Final answer:
Capnography is the preferred noninvasive respiratory monitoring device when immediate visibility to hypoventilation is needed. It measures the concentration of carbon dioxide in the exhaled breath and provides real-time feedback on the patient's ventilation status.
Step-by-step explanation:
The preferred noninvasive respiratory monitoring device when immediate visibility to hypoventilation is needed is capnography. Capnography measures the concentration of carbon dioxide (CO2) in the exhaled breath, which provides real-time feedback on the patient's ventilation status. It can quickly detect respiratory depression or insufficient ventilation, making it a valuable tool in emergency situations.