Determination of right ventricular ejection fraction by thermodilution technique ? a comparison to biplane cineventriculography

Comparative Assessment of Right Ventricular Volumes and Ejection Fraction by Thermodilution and Magnetic Resonance Imaging in Dilated Cardiomyopathy

“…Another reason for the relatively limited correlations between MRI and thermodilution could be the relatively large RV volumes in our study group, which result in incomplete mixing of the indicator. This point has also been stressed by Voelker et al [5], who found a better correlation between thermo and angio measurements for patients with an absolute RVEDV < 160 ml (r = 0.91) as compared to patients with a RVEDV > 160 ml (r = 0. 80).…”

“…The development of new fast response thermistors resulted in several clinical studies in which quantification of RV volumes by thermodilution methods was compared to angiographic [5,8,9,21,22], radionuclide methods [23] as well as two-dimensional echocardiography [24], In all studies significant correlations between thermodilu tion and reference methods could be found with a correla tion coefficient of 0.6 [6] to 0.92 [7] for RVEF. Neverthe less, absolute values of RV volumes determined by ther modilution showed a wide scatter of values and often a lack of correlation.…”

“…Calculation of the ratio between the tempera ture decreases of two successive diastolic plateaus yields an estimate of the residual fraction (RF) of the RV. The EF is then calculated as: EF = 1 -RF [5,6,14], Cardiac output is calculated from the same pulmonary artery temperature curve by using the Stewart-Hamilton equation [14] and cardiac output divided by heart rate yields the stroke volume (SV). Using heart rate and EF.…”

“…Several studies comparing thermodilution measurements with bi plane angiographic data showed the usefulness of this method for the determination of RV volumes and EF in Received: August 22. 1994 Accepted: September 7.1994 patients with various cardiac diseases [5][6][7], However, limitations of angiographic RV volume measurements include impaired sharpness of ventricular contours due to trabeculations, variable spatial orientation of the RV, and the lack of a single geometric reference model to fit all possible ventricular shapes [8,9], Magnetic resonance imaging (MRI) can be regarded as an alternative imaging modality allowing volume quantif ication of both the RV and the LV and is now being con sidered as the gold standard for volume quantification in vivo [10][11][12], Thus, the purpose of our study was to validate the accuracy of a thermodilution technique for RV volume quantification using simultaneous MRI in patients with dilated cardiomyopathy.…”

Effects of Exercise or Temporary Coronary Occlusion during Angioplasty on Right Ventricular Function with Consideration of Left-Anterior-Descending- and Right-Coronary-Artery-Related Myocardial Ischemia

“…The applicability of this method was recently improved by the introduction of computerized analysis of the obtained temperature decay curves [8,9], The computerized system showed good correla tions with angiographic and radionuclide de terminations [8][9][10][11][12], Using this method, the variability for the determination of right ven tricular ejection fraction ranges between 7 and 12% [4, 9,11,13,14], Sequential volu metric determinations can be performed in time intervals shorter than 30 s [4],…”