Multicenter Study

Noninvasive monitoring of cardiac output in critically ill patients using transesophageal Doppler.

Am. J. Respir. Crit. Care Med. 1998 Jul 1;158(1):77-83.
Article

Intraoperative estimation of cardiac output by transesophageal pulsed Doppler echocardiography.

Anesthesiology. 1991 Jan 1;74(1):9-14.
Comparative Study

Transoesophageal echocardiography accurately detects cardiac output variation: a prospective comparison with thermodilution in cardiac surgery.

Eur J Anaesthesiol. 2008 Feb 1;25(2):135-43.