Estimation of left ventricular residual volume in the dog by a thermodilution method.

• The importance of ventricular volume as one of the determinants of stroke output has led to the development of methods for measuring ventricular volumes in vivo, using either radiographic techniques" or applications of the indicator-dilution principle."TM The latter method requires the rapid injection of an indicator into the ventricle and registration of the resultant time-concentration curve immediately outside.