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Figure 2 This figure illustrates the ambiguous nature of the septal-to-posterior wall motion delay (SPWMD) measurement even when both walls were well visualized. It is uncertain whether the septal wall deflection should be measured at A, the first deflection, at B, the middle of the larger area of deflection, or at point C where the maximum deflection is seen. The initial septal wall deflection is too close to the QRS to represent contraction and may reflect posterior motion resulting from ventricular interaction. The middle of the larger area of septal wall deflection is appropriately timed while the maximum septal wall deflection occurs in diastole.
