Ensemble averaged measured pressure gradient over 60 cycles, calculated pressure gradient from Bernoulli, pressure gradient from Garcia et al and derived pressure gradient variations versus time for (a) CO = 3L/min, 60 bpm (b) CO = 3L/min, 90 bpm (c) CO = 3L/min, 120 bpm (d) CO = 5L/min, 60 bpm (e) CO = 5L/min, 90 bpm and (f) CO = 5L/min, 120 bpm.