Long treatments showed more stability of peripheral systolic blood pressure ( change during HD@ , -@ mm Hg ; during HDF@ , -@ mm Hg ; during HD@ , -@ mm Hg -LSB- P = @ vs. HD@ ; P = @ vs. HDF@ -RSB- ; and during HDF@ , -@ mm Hg -LSB- P = @ vs. HD@ ; P = @ vs. HDF@ -RSB- ) .