Immediate Postnatal Ventricular Performance Is Associated with Mortality in Hypoplastic Left Heart Syndrome
Abstract
Right ventricular (RV) function as assessed by deformation has been evaluated prenatally and after palliation in hypoplastic left heart syndrome (HLHS). However, limited data exist about the immediate postnatal cardiac adaptation and RV function in HLHS. We compared echocardiographic measures of cardiac performance in HLHS versus controls in their first week of life. As a secondary objective, we evaluated if markers at the first echocardiogram were associated with mid- and long-term outcomes. Clinical and echocardiographic data of patients with HLHS between 2013 and 2016 were reviewed. The study population was matched with controls whose echocardiograms were obtained due to murmur or rule out coarctation. Speckle-tracking echocardiography was used to assess deformation. Thirty-four patients with HLHS and 28 controls were analyzed. Age at echocardiogram was similar between HLHS and controls. The RV of HLHS was compared to both RV and left ventricle (LV) of controls. HLHS deformation parameters [RV peak global longitudinal strain (GLS), global longitudinal strain rate (GLSR)] and tricuspid annular plane systolic excursion (TAPSE) were decreased compared to RV of controls. The LV-fractional area change, peak GLS, GLSR, circumferential strain, and strain rate of controls were higher than the RV of HLHS. Calculated cardiac output (CO) was higher in the HLHS group (592 vs. 183 mL/kg/min, p = 0.0001) but similar to the combined LV and RV output of controls. Later mortality or cardiac transplantation was associated with the RV CO and RV stroke distance at initial echocardiogram. Cox proportional hazard regression determined that restriction at atrial septum, decreased initial RV stroke distance and decreased TAPSE had a higher risk of death or cardiac transplantation. TAPSE and RV stroke distance by velocity time integral had adequate inter-reader variability by Bland–Altman plot and Pearson’s correlation. Our study found that the HLHS RV deformation is decreased in the early postnatal period when compared to both LV and RV of controls, but deformation was not associated with mid- and long-term outcomes. Later mortality or cardiac transplantation was associated with decreased initial stroke distance and cardiac output. Early evaluation of patients with HLHS should include an assessment of stroke distance and future research should evaluate its implication in management strategies.
Keywords
Hypoplastic left heart syndrome (HLHS) Speckle-tracking echocardiography Ventricular performance Cardiac output Neonatal adaptation Mortality OutcomesAbbreviations
- AA
Aortic atresia
- AS
Aortic stenosis
- AV
Aortic valve
- CO
Cardiac output
- DICOM
Digital imaging and communications in medicine format
- EF
Ejection fraction
- ECMO
Extracorporeal membrane oxygenation
- FAC
Fractional area change
- HUS
Head ultrasound
- HLHS
Hypoplastic left heart syndrome
- IVH
Intra-ventricular hemorrhage
- LV
Left ventricle
- LVOT
Left ventricular outflow tract
- MRI
Magnetic resonance imaging
- MD
Minute distance
- MA
Mitral atresia
- MS
Mitral stenosis
- MV
Mitral valve
- NICU
Neonatal intensive care unit
- pGLS
Peak global longitudinal systolic
- PW
Pulsed-wave
- PV
Pulmonary valve
- RV
Right ventricle
- SGA
Small for gestational age
- SR
Strain rate
- SVC
Superior vena cava
- TAPVR
Total anomalous pulmonary venous return
- TV
Tricuspid valve
- TAPSE
Tricuspid annular plane systolic excursion
- VVI
Velocity vector imaging
- VTI
Velocity time integral
- VSD
Ventricular septal defect
Notes
Compliance with Ethical Standards
Conflict of interest
We have no conflict of interest related to the content of this study. Gabriel Altit is the author that wrote the first draft. There was no payment, grant, or honorarium given to anyone to produce the manuscript. All the authors (Gabriel Altit, Shazia Bhombal, Valerie Y. Chock, and Theresa A. Tacy) declare that they have no conflict of interest.
Ethical Approval
This study was approved by the institutional review board of Stanford University (protocol—IRB-39544). All procedures performed in studies involving human participants were in accordance with the ethical standards of the institutional and/or national research committee and with the 1964 Helsinki declaration and its later amendments or comparable ethical standards.
Supplementary material
References
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