Effects of Injection Site on the Accuracy of Thermal Washout: Discussion (8)
This result could not be directly applied to the in vivo situation; however, clinical investigation with alternate RA or RV injections yielded similar phenomena. This strongly suggests that RA injection or calculation of mean value may lead to underestimation of the actual RVEF; however, we did not compare thermal RVEF with those obtained from other methods in our patients. We therefore cannot conclude which of the values from RA and RV injections is closest to the actual RVEF in this investigation. There is a good correlation of RVEF values between thermal washout method and other methods (cineventriculography, echocardiography, RI-angiography). Thermal washout method results may reflect actual RVEF, so that a good correlation with other methods is very reasonable; however, this does not mean that the method measures the true RVEF. Actually, thermal RVEF values are low compared with those obtained by other methods,’’ and since there is no gold standard for RVEF and thermal washout method can be used without assumption of RV anatomic configuration, it is important to improve the accuracy of this method. buy yasmin online
In conclusion, when comparing the EFs obtained from RA or RV injection alternately in the same patients, RA injection was found to result in significantly low EFs. In analysis of factors affecting EFs in the model experiment, it was observed that EF1 and EF2 obtained from RV injection might be closest to the actual values because of the least interference by ventricular and catheter cooling.