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Figure 4 (A) Representative pressure recordings and timing of pressure differences in the left ventricular (LV) inflow and outflow tracts. The data are presented as the mean value ± SD at baseline for 12 dogs. a, Duration of pressure gradient between the mitral tip and subaortic regions. b, Interval from the start of the pressure gradient (onset of flow) in the LV inflow tract to its peak. c, Interval from the start of the LV outflow tract pressure gradient to its peak. (B) The same pressure recordings as in part A, with the timing of flow velocities in LV inflow and outflow tracts. Again, the data are presented as the mean value ± SD at baseline for the same 12 dogs as in part A. LAP and LVP = pressure in left atrium and left ventricle, respectively.