Which device would best assist in assessing a patient for possible pulmonary embolism?

The correct choice for assessing a patient for possible pulmonary embolism is the capnometer. This device measures the concentration of carbon dioxide (CO2) in exhaled air, providing important data related to the patient's ventilation and perfusion status. In the context of a pulmonary embolism, where blood flow to the lungs is obstructed, abnormalities in CO2 levels can be indicative of impairment in gas exchange.

Capnometry can help detect changes in ventilation that may occur due to a significant pulmonary embolus, as the patient may exhibit signs of hypoventilation or altered respiratory patterns. Monitoring CO2 levels is critical in emergency situations where a pulmonary embolism is suspected, as timely identification can lead to rapid intervention.

Other devices listed, while useful in different contexts, do not specifically target the assessment of pulmonary embolism as effectively as a capnometer. CO-oximeters measure various forms of hemoglobin, which can help assess oxygen transport but do not provide direct information on ventilation or blood flow issues. E-Zcap CO2 detectors aid in confirming intubation but are not typically used for comprehensive evaluation of respiratory function. The radio-doppler is used to assess blood flow in veins and arteries but is not a direct measure of pulmonary