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The value of right ventricular longitudinal strain in the evaluation of adult patients with repaired tetralogy of Fallot: a new tool for a contemporary challenge

Published online by Cambridge University Press:  26 May 2016

Luís Almeida-Morais*
Affiliation:
Department of Cardiology, Hospital de Santa Marta, Centro Hospitalar de Lisboa Central, Lisbon, Portugal
Tiago Pereira-da-Silva
Affiliation:
Department of Cardiology, Hospital de Santa Marta, Centro Hospitalar de Lisboa Central, Lisbon, Portugal
Luísa Branco
Affiliation:
Department of Cardiology, Hospital de Santa Marta, Centro Hospitalar de Lisboa Central, Lisbon, Portugal
Ana T. Timóteo
Affiliation:
Department of Cardiology, Hospital de Santa Marta, Centro Hospitalar de Lisboa Central, Lisbon, Portugal
Ana Agapito
Affiliation:
Department of Cardiology, Hospital de Santa Marta, Centro Hospitalar de Lisboa Central, Lisbon, Portugal
Lídia de Sousa
Affiliation:
Department of Cardiology, Hospital de Santa Marta, Centro Hospitalar de Lisboa Central, Lisbon, Portugal
José A. Oliveira
Affiliation:
Department of Cardiology, Hospital de Santa Marta, Centro Hospitalar de Lisboa Central, Lisbon, Portugal
Boban Thomas
Affiliation:
MRI Caselas, Lisbon, Portugal
Nuno Jalles-Tavares
Affiliation:
MRI Caselas, Lisbon, Portugal
Rui Soares
Affiliation:
Department of Cardiology, Hospital de Santa Marta, Centro Hospitalar de Lisboa Central, Lisbon, Portugal
Ana Galrinho
Affiliation:
Department of Cardiology, Hospital de Santa Marta, Centro Hospitalar de Lisboa Central, Lisbon, Portugal
Rui Cruz-Ferreira
Affiliation:
Department of Cardiology, Hospital de Santa Marta, Centro Hospitalar de Lisboa Central, Lisbon, Portugal
*
Correspondence to: L. Almeida-Morais, MD, Department of Cardiology, Hospital de Santa Marta, Rua de Santa Marta, no. 50, 1169-024 Lisbon, Portugal. Tel: +351 21 359 4000; Fax: +351 213 144 916; E-mail: lmmorais88@gmail.com

Abstract

Objective

The role of right ventricular longitudinal strain for assessing patients with repaired tetralogy of Fallot is not fully understood. In this study, we aimed to evaluate its relation with other structural and functional parameters in these patients.

Methods

Patients followed-up in a grown-up CHD unit, assessed by transthoracic echocardiography, cardiac MRI, and treadmill exercise testing, were retrospectively evaluated. Right ventricular size and function and pulmonary regurgitation severity were assessed by echocardiography and MRI. Right ventricular longitudinal strain was evaluated in the four-chamber view using the standard semiautomatic method.

Results

In total, 42 patients were included (61% male, 32±8 years). The mean right ventricular longitudinal strain was −16.2±3.7%, and the right ventricular ejection fraction, measured by MRI, was 42.9±7.2%. Longitudinal strain showed linear correlation with tricuspid annular systolic excursion (r=−0.40) and right ventricular ejection fraction (r=−0.45) (all p<0.05), which in turn showed linear correlation with right ventricular fractional area change (r=0.50), pulmonary regurgitation colour length (r=0.35), right ventricular end-systolic volume (r=−0.60), and left ventricular ejection fraction (r=0.36) (all p<0.05). Longitudinal strain (β=−0.72, 95% confidence interval −1.41, −0.15) and left ventricular ejection fraction (β=0.39, 95% confidence interval 0.11, 0.67) were independently associated with right ventricular ejection fraction. The best threshold of longitudinal strain for predicting a right ventricular ejection fraction of <40% was −17.0%.

Conclusions

Right ventricular longitudinal strain is a powerful method for evaluating patients with tetralogy of Fallot. It correlated with echocardiographic right ventricular function parameters and was independently associated with right ventricular ejection fraction derived by MRI.

Type
Original Articles
Copyright
© Cambridge University Press 2016 

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