20. RWR (reflection wave ratio) = da/ab x 100 RWR = Reflection Wave Ratio (da/ab x 100) PS1 = Suprasystolic pressure wave amplitude dp/dt = Contractility (Peak change in slope of PS1) RWTT = Reflected Wave Transit Time (a-c) SEP = Systolic Ejection Period (a-e) PS1 RWTT a b c d e ab da SEP dp/dt
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23. Baseline Reflection Wave Ratio vs. Age (n=200 hips) R = 0.491 -1 0 1 2 3 4 5 6 7 8 9 30 40 50 60 70 80 90 RWR > 400% are over 70 years of age Age
24. Baseline RWTT* vs. Age (n=200 hips) *surrogate of pulse wave velocity Age .08 .1 .12 .14 .16 .18 .2 .22 .24 .26 .28 .3 30 40 50 60 70 80 90 R = 0.495