Resumen

FERREIRO, Myriam et al. ECHOCARDIOGRAPHIC INDEXES HELP PREDICT THE NEED FOR NUCLEAR MAGNETIC RESONANCE EVALUATION OF PATIENTS WITH REPAIRED TETRALOGY OF FALLOT. Rev Chil Cardiol [online]. 2013, vol.32, n.1, pp.46-50. ISSN 0718-8560.  http://dx.doi.org/10.4067/S0718-85602013000100006.

Background: Pulmonary insufficiency (PI) frequently appears long-term after repair of Tetralogy of Fallot (TOFr). Cardiac magnetic resonance (CMR) plays a fundamental role in the indication of pulmonary valve replacement, in order to avoid complications of PI. However, CMR is a scarce and expensive resource in our reality, which is why its indication must be optimized. Aim: The objective of this work is to find echocar-diographic indices to identify patients with TOFr with dilated RV and reduced ejection fraction (EF). Method: Images from echocardiograms (ECHO) and CMR in 20 patients (9 women, 8-25 years of age, average 15,8 years old) with TOFr were retrospectively reviewed. From ECHO images we obtained measurements for tricuspid annular plane systolic excursion (TAPSE), tissular s wave, isovolumetric acceleration (IVA), and severity of PI (mild, moderate, or severe). From CMR images, we measured EF, end diastolic volume (EDV) of the RV, and regurgitant fraction (RF) of the pulmonary artery. We performed a multivariate statistical analysis to explore the relation between ECHO parameters and CMR findings. Results: No correlation was found between individual ECHO parameters and EDV or RV EF. However, we did find a model based on the TAPSE and PI that was able to predict the EDV of the RV with an r2 = 0.6. (FDV-RV = 8.60*TAPSE + 36.19*PI - 77.213). After comparing the PI with RF, we found that that echocar-diography could correctly distinguish cases with mild PI from those with severe PI (p<0.001), or moderate from severe (p=0.004), but not mild from moderate PI. Conclusion: In this preliminary study, we found a statistical model based on the TAPSE and PI which could be useful in the selection of patients with TOFr that are referred to CMR. While this study needs to be validated on a greater number of patients, it indicates the relevance of some echocardiographic parameters, which should always be included in the evaluation of patients with TOFr.

Palabras clave : Cardiac magnetic resonance imaging; Echocardiography; Tetralogy of Fallot.

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