monitored
v. B2 Upper Intermediate US //ˈmɑnətɝd// UK //mˈɒnɪtəd// mon·i·tored
v. to watch or check something carefully over a period of time. You do this to see how a situation changes or to make sure everything is working correctly.
v. to observe and check the progress or quality of something over a period of time; to keep under systematic review. Transitive — requires a direct object.
The doctors monitored his heart rate all night.
Security guards monitored the entrance through several cameras to ensure only authorized staff entered the building.
Environmental scientists monitored the local water supply for several months to determine if the nearby factory was leaking hazardous chemicals into the river.
Usage
The verb is transitive and takes a direct object; often used in the passive voice in technical or medical contexts.