Conclusion
The novel use of the TEE probe for transthoracic examination of patients in the prone position is feasible and reproducible. There was a good agreement between the 2D linear measurements of the LV and AoR in the prone position compared to the corresponding measurements obtained in the supine position by the standard transthoracic technique. However, the EF was lower, and left atrial anteroposterior diameter was smaller in the prone position.

Acknowledgement of grant support

This research received no specific grant from any funding agency in the public, commercial, or not-for-profit sectors.

Conflict of interest

The authors declare that there is no conflict of interest.

Ethical approval

All procedures performed in studies involving human participants were in accordance with the ethical standards of the institution and with the 1964 Helsinki declaration and its later amendments.

Informed consent

The informed consent was obtained from all participants included in the study.