tokens: No significant difference in plasma ET levels was found between cardiac and peripheral sampling sites ( pulmonary artery ; 1 . 07 + / - 0 . 28 , right atrium ; 1 . 02 + / - 0 . 28 , peripheral artery ; 1 . 12 + / - 0 . 23 , peripheral vein ; 1 . 14 + / - 0 . 38 fmol / ml : N . S . ) , or among patients with uncomplicated MI , unstable angina ( 1 . 00 + / - 0 . 32 fmol / ml ) , and healthy subjects ( 1 . 01 + / - 0 . 29 fmol / ml ) .