<prompt> The names Brechner and Bethune are associated with which of the following devices?Precordial DopplerTransesophageal echocardiographyPlethysmographyEnd tidal capnography  <response>: Ans. d. End tidal capnography Ref: Bethune, R. W. M., and Brechner, V. L. 1968. Detection of venous air embolism by carbon dioxide monitoring. Anesthesiology, 29, 178Brechner and Bethune are associated with end-tidal capnography. 