Final answer:
The invasive procedure is called transesophageal echocardiography (TEE). It uses a gastroscope with a transducer attached to view the heart from behind through the esophagus.
Step-by-step explanation:
The invasive procedure that involves the introduction of a transducer attached to the end of a gastroscope into the esophagus to allow for closer approximation with the heart is called transesophageal echocardiography (TEE).
Transesophageal echocardiography is a diagnostic test that uses a small probe or transducer on the end of a gastroscope to create detailed images of the heart and its structures. The probe is inserted into the esophagus, which is located directly behind the heart, providing a closer and clearer view compared to external echocardiography.
During the procedure, the patient is typically sedated, and the transducer is guided into the esophagus. Sound waves are then emitted from the transducer and bounce off the heart structures, creating images that can help assess the function and condition of the heart.