The primary aim of this study is to investigate the difference in the first attempt and overall success rate of different techniques for insertion of transesophageal echocardiography. Secondary aim is to investigate the difference of the duration of insertion using the selected technique, complications during insertion such as oropharyngeal mucosal injury and hematoma.
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difference in the first attempt and overall success rate
Timeframe: participants will be followed from the beginning of the transesophageal echocardiography probe insertion through the mouth to the confirmation of successful insertion (10 minutes)