What is a monitoring device that gives information about both circulation and ventilation?

A capnograph is the correct answer because it measures the concentration of carbon dioxide (CO2) in exhaled air, providing vital information about both ventilation (the process of air moving in and out of the lungs) and circulation (how effectively the blood is carrying CO2 away from the tissues). By analyzing the capnogram, healthcare providers can assess the adequacy of ventilation; if ventilation is compromised, changes in CO2 levels will reflect that. In addition, since CO2 levels are directly related to metabolic activity and blood circulation, the capnograph also conveys critical insights into a patient’s cardiovascular status.

The sphygmomanometer measures blood pressure, which provides circulation information but does not give any insights regarding ventilation. An ECG monitor displays the electrical activity of the heart and primarily assesses cardiac function, not respiratory status. A thermometer measures body temperature, which is useful in various medical assessments but does not provide data on either circulation or ventilation. Thus, the capnograph stands out as the device that effectively monitors both aspects simultaneously.