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Assessment of Speckle-Tracking Echocardiography-Derived Global Deformation Parameters During Supine Exercise in Children

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Abstract

Exercise echocardiography is an underutilized tool in pediatrics with current applications including detecting segmental wall abnormalities, assessing the utility of global ventricular function, and measuring pulmonary hemodynamics. No prior study has applied speckle-tracking echocardiography (STE) during exercise echocardiography in children. The aim of this study was to determine the feasibility of measuring speckle-tracking-derived peak systolic velocities, global longitudinal and circumferential strain, and global strain rates at various phases of exercise. Ninety-seven healthy children underwent cardiopulmonary exercise testing using supine cycle ergometry. The exercise stress test consisted of baseline pulmonary function testing, monitoring of blood pressure and heart rate responses, electrocardiographic recordings, and oxygen saturations while subjects pedaled against a ramp protocol based on body weight. Echocardiographic measurements and specifically speckle-tracking analysis were performed during exercise at baseline, at a heart rate of 160 beats per minute and at 10 min after exercise. Peak systolic velocity, peak systolic strain, and peak systolic strain rate at these three phases were compared in the subjects in which all measurements were accurately obtained. We were able to complete peak velocity, strain, and strain rate measurements in all three exercise phases for 36 out of the 97 subjects tested. There was no significant difference between the feasibility of measuring circumferential versus longitudinal strain (p = 0.25, B-corrected = 0.75). In the 36 subjects studied, the magnitude of circumferential strain values decreased from −18.3 ± 4.8 to −13.7 ± 4.0 % from baseline to HR 160 (p < 0.0001, B-corrected < 0.0001), before returning to −19.6 ± 4.4 % at recovery (p = 0.19 when compared to baseline). Longitudinal strain did not vary significantly from baseline to HR 160 (from −17.7 ± 4.4 to −16.6 ± 4.4 %, p = 0.16); likewise the average recovery strain was no different from those values (−18.4 ± 3.6 %; p = 0.34). Peak circumferential and longitudinal strain rates increased from baseline to HR 160, but neither decreased to baseline levels after 10 min of recovery, which correlated with heart rate variations with exercise. We studied the effects of frame rate on deformation measurements and we observed no difference between measurements taken at lower (<60 frames per second, fps) and higher (≥60 fps) frame rates. This study shows that it is technically difficult to retrospectively measure peak velocities, strain, and strain rate in exercising pediatric subjects with STE. The majority of subjects that were excluded from the study had inadequate echocardiographic images when tachycardic from increased respiratory effort and body movements near peak exercise. Improvements in technique and higher image frame rates could make application of STE to pediatric cardiopulmonary testing more successful in the future.

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Acknowledgments

The study was funded through the Lucile Packard Children’s Hospital Innovations in Patient Care grant.

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Authors and Affiliations

  1. Division of Cardiology, The Children’s Hospital of Philadelphia, Perelman School of Medicine, Ste 8 NW 90, 3400 Civic Center Boulevard, Philadelphia, PA, 19104, USA

    Michael Y. Liu

  2. Stanford University, Lucile Packard Children’s Hospital Stanford, Palo Alto, CA, USA

    Theresa Tacy & Rajesh Punn

  3. Cincinnati Children’s Hospital Medical Center, Cincinnati, OH, USA

    Clifford Chin

  4. Connecticut Children’s Medical Center, Hartford, CT, USA

    Derek Y. Obayashi

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  1. Michael Y. Liu
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Correspondence to Michael Y. Liu.

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Liu, M.Y., Tacy, T., Chin, C. et al. Assessment of Speckle-Tracking Echocardiography-Derived Global Deformation Parameters During Supine Exercise in Children. Pediatr Cardiol 37, 519–527 (2016). https://doi.org/10.1007/s00246-015-1309-z

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