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Figure 2 Data example of the transmitral pressure difference in a representative cardiac cycle. The dashed line represents the invasively measured pressure difference with two positive gradients, one during early diastole and one during atrial contraction, and a mid-diastolic gradient reversal. The reconstructed pressure difference using the simplified Bernoulli equation is displayed in the thin solid line, showing significant underestimation and delay relative to the catheter measurements. Data from the complete Bernoulli equation is represented by the thicker solid line, which tracks the catheter data much more closely.
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