Prospective comparison of circumferential and longitudinal strain in asymptomatic children with single left ventricle, single right ventricle and normal hearts
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KeywordsLongitudinal Strain Free Wall Circumferential Strain Single Ventricle Short Axis Slice
Ventricular dysfunction in patients with a single right ventricle (SRV) or a single left ventricle (SLV) is a known risk factor for morbidity and mortality. However, the differences in SRV and SLV function remain poorly understood, with only a few studies performed1-3. In this study, we measure the strain using cardiac MRI and perform comprehensive comparison of the global and regional strain in both the circumferential (εcc) and longitudinal (εL) dimension. Purpose: In normal subjects and asymptomatic patients with SLV and SRV after total cavopulmonary connection (TCPC), compare: 1) Global εcc and εL strain, 2) Regional circumferential and longitudinal strains at free wall (εcc-free, εL-free) and septum (εcc-sept, εL-sept), 3) εcc and εL across the ventricle from apex to base.
We performed a prospective analysis of 18 subjects (7 normal age: 11.8 +/- 3; 6 SRV age: 11.4 +/- 2.3; 5 SLV age: 12.7 +/- 4.2). Acquisition Protocol: Strain information was acquired at three short axis slices at basal, mid-cavity, and apical locations in all 18 subjects in a 1.5T MRI scanner (Philips Acheiva) using: a) Complementary Spatial Modulation of Magnetization (CSPAMM)4 images: Used for generating εcc; and b) Fast-Strain Encoded (fSENC)5 images: Used for generating εL. Data Analysis: εcc and εL across all cardiac phases and slices were calculated from SAX slices using DiagnosoftTM. The ventricular regions at each slice were assigned based upon the AHA 16 segment model. εcc-sept, εL-sept, εcc-free, and εL-free were also calculated for each slice and compared.
Strain values of SLV and SRV demonstrate significant differences compared to normal subjects. Septal circumferential strain is significantly reduced in single ventricle patients while the free wall strain is normal. Circumferential strain of the SV progressively reduces from the apex to the base, suggesting a deleterious effect of the hypoplastic chamber connected to the base.
- 2.Kaneko, et al: JASE. 2012, 25 (11): 1222-1228. NovemberGoogle Scholar
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