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Figure 1 Septal wall motion delay (SWMD) was measured in M-mode by measuring from the start of the QRS to the peak of the septal wall deflection. Posterior wall motion delay (PWMD) was measured similarly by measuring from the start of the QRS to the peak of the posterior wall deflection. The difference between the septal wall deflection and the posterior wall deflection is the septal-to-posterior wall motion delay (SPWMD).