RESULTS
We retrospectively identified 49 patients who met the inclusion
criteria. Their characteristics are presented in Table 1. They had 63
CMR and 2D TTE exams allowing measurements adequate for analysis and
comparison. The means, SDs, and reference ranges of the RVOT diameters
by CMR and 2D TTE, indexed to BSA, are presented in Table 2.
Figure 3 and Figure 4 show the correlation between the CMR and 2D TTE
measurements. The RVOT diameter measured in the strict transverse view
by CMR exhibited very strong correlation with the similar PSAX view by
2D TTE (r = 0.84; p <0.0001), and the RVOT
diameter measured in the strict sagittal view by CMR exhibited strong
correlation with the similar PLAX view by 2D TTE (r = 0.78;p <0.0001).
Figure 5 and Figure 6 show the agreement between the CMR and 2D TTE
measurements. The RVOT diameter measurements in the strict transverse
view by CMR and the similar PSAX view by 2D TTE exhibited poor agreement
with significant bias (bias = -3.34 mm/m2 or -16.6%;
SD of bias = 2.81 mm/m2 or 14.6%). The RVOT diameter
measurements in the strict sagittal view by CMR and the similar PLAX
view by 2D TTE also exhibited poor agreement with significant bias (bias
= -3.90 mm/m2 or -19.7%; SD of bias = 3.18
mm/m2 or 13.4%).