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Figure 14: The lateral tethering angle is the angle between the plane of the tricuspid valve (TV) and the anterior papillary muscle (APM) at end systole. This patient, with a lateral tethering angle of 71º, had moderate TV insufficiency (TVI) requiring surgical repair

Figure 14: The lateral tethering angle is the angle between the plane of the tricuspid valve (TV) and the anterior papillary muscle (APM) at end systole. This patient, with a lateral tethering angle of 71º, had moderate TV insufficiency (TVI) requiring surgical repair