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Figure 4 Proportion of Patients Who Were EF Responders to Resynchronization Therapy
All patients had 2-site tissue Doppler measures of longitudinal dyssynchrony along with radial strain dyssynchrony (left), and a subgroup of 67 patients had 12-site tissue Doppler measures of longitudinal dyssynchrony along with radial strain dyssynchrony (right). A pattern of both longitudinal and radial dyssynchrony was associated with ejection fraction (EF) response, whereas a pattern of neither longitudinal nor radial dyssynchrony was associated with EF nonresponse, particularly when the 12-site tissue Doppler method excluded dyssynchrony. A heterogeneous pattern of either longitudinal or radial dyssynchrony (but not both) had an intermediate proportion of responders. *p < 0.05 versus both groups;  p < 0.05 versus either group.
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