Little has been reported on the left ventricular myocardial distension (bounce) and its utility to assess cardiac function. The purpose of this study is to determine whether myocardial bounce at end diastole is reproducibly visualized by blinded observers and to determine whether it corresponds to systolic and diastolic function. 144 Consecutive cardiac MR exams between September and December 2017 were selected for analysis. The bounce was graded by two blinded observers, and the change in LV diameter pre and post bounce was measured. The bounce was defined as the rapid change in LV volume that occurs at the end of diastole during atrial contraction just prior to systolic ejection. Inter-reader agreement was summarized using Cohen's kappa. Spearman's rank correlation coefficient was used to evaluate associations between bounce grade and cardiac physiology parameters. Overall agreement was good with unweighted kappa = 0.69 (95% CI 0.60-0.79). Bounce grade was significantly correlated with the average change in LV diameter before and after the bounce (Spearman's rho = 0.76, p < 0.001). Median diameter changes were 0.0, 1.9, and 4.2 mm in grades 0 (no bounce), 1 (small bounce), and 2 (normal), respectively. The bounce lasted 8 to 12 ms in all patients. Bounce grade was significantly correlated with LV EF (Spearman's rho = 0.43, p < 0.001).
PurposeIn a prior publication, loss of myocardial bounce was highly associated with systolic and diastolic dysfunction. The bounce is the rapid change in LV volume at the end of diastole during atrial contraction just prior to systolic ejection. This study attempts to determine if bounce is associated with diastolic dysfunction determined by echocardiography.Methods135 patients with an echocardiogram and a cardiac MR were selected with 38% of those paired of studies within three months of each other. The bounce was graded by 3 blinded observers into categories of 0=none, 1=minimal/reduced, and 2=normal bounce.ResultsInter-reader agreement was summarized using the intraclass correlation coefficient (ICC) and ratings was moderate [ICC 0.60, 95% confidence interval (0.51-0.68)]. The sensitivity and specificity of lack of bounce (grade 0 or 1) as a screen for diastolic dysfunction on echo were 89% and 47%, respectively.ConclusionThe simple observation of a normal myocardial bounce in MRs was predictive of normal diastolic function and lack of was highly associated with dysfunction determined via echocardiography. Systolic function remains normal in some of these patients and this finding may represent diastolic dysfunction. Further studies examining the relationship between bounce with different types of diastolic function is needed. This updated study confirms myocardial bounce seen on various cardiac imaging modalities may be a simple useful tool for detecting cardiac dysfunction.
PurposeIn a prior publication, loss of myocardial bounce was highly associated with systolic and diastolic dysfunction. The bounce is the rapid change in LV volume at the end of diastole during atrial contraction just prior to systolic ejection. This study attempts to determine if bounce is associated with diastolic dysfunction determined by echocardiography.Methods135 patients with an echocardiogram and a cardiac MR were selected with 38% of those paired of studies within three months of each other. The bounce was graded by 3 blinded observers into categories of 0=none, 1=minimal/reduced, and 2=normal bounce.ResultsInter-reader agreement was summarized using the intraclass correlation coefficient (ICC) and ratings was moderate [ICC 0.60, 95% confidence interval (0.51-0.68)]. The sensitivity and specificity of lack of bounce (grade 0 or 1) as a screen for diastolic dysfunction on echo were 89% and 47%, respectively.ConclusionThe simple observation of a normal myocardial bounce in MRs was predictive of normal diastolic function and lack of was highly associated with dysfunction determined via echocardiography. Systolic function remains normal in some of these patients and this finding may represent diastolic dysfunction. Further studies examining the relationship between bounce with different types of diastolic function is needed. This updated study confirms myocardial bounce seen on various cardiac imaging modalities may be a simple useful tool for detecting cardiac dysfunction.
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