This guide explains transoesophageal echocardiography (TEE), a cardiac imaging procedure where an ultrasound probe is inserted through the mouth into the esophagus to obtain detailed heart images when standard echocardiography is insufficient. It covers the one-hour procedure process including sedation and throat numbing, preparation requirements like fasting, post-procedure precautions including avoiding eating for two hours, potential risks, and when results will be available.