1. Cardiopulmonary bypass in a gravid patient: perioperative changes in endothelin levels 
James L Zellner, MD, Scott B Kribbs, BS, B.Hugh Dorman, MD, PhD, Francis G Spinale, MD, PhD 
The Annals of Thoracic Surgery 
Volume 66, Issue 1, Pages (July 1998)
DOI: /S (98)00383-X

2. Fig 1
Perioperative changes in venous and arterial plasma endothelin levels in a gravid patient undergoing mitral valve replacement. Plasma endothelin levels before and during cardiopulmonary bypass (CPB) were consistently elevated above baseline levels. Further elevations in plasma endothelin level occurred after weaning from CPB, with levels increased to more than twice the baseline level at 24 hours postoperatively. At 36 hours postoperatively, arterial plasma endothelin level decreased, yet remained elevated above baseline levels.
The Annals of Thoracic Surgery  , DOI: ( /S (98)00383-X)