title: Arterial blood pressure and vascular function in human saphenous vein.
abstract: Hypertension is a risk factor for accelerated saphenous vein (SV) graft disease and endothelial dysfunction in a number of vascular territories. We examined the relationship between blood pressure (BP) and vascular function in SV from 94 male patients undergoing coronary artery bypass grafting (CABG). Patients were pretreated with respect to cholesterol (3.4±1.2 mmol/L) and BP (systolic 139±22 mmHg, diastolic 74±13 mmHg). All patients were taking aspirin, 85% statins, 50% angiotensin-converting enzyme inhibitors and 70% beta-blockers. We demonstrate in human SV rings ex vivo that increased BP has no effect on acetylcholine-mediated vasodilatation (p=0.58), nor on the constrictor response to L-NMMA (p=0.98), but has a positive association with the constrictor response to phenylephrine (p=0.008) and a negative correlation with the vasodilator response to sodium nitroprusside (p=0.03). These results may provide further explanation for the high incidence of early vein graft failure after CABG in hypertensive patients and support an aggressive approach to optimize BP before surgery.
authors: Cardiothoracic Department, St George's Hospital, London, UK mominaziz@hotmail.com.
authors: A
authors: A
authors: Momin
authors: Cardiothoracic Surgery, National Heart and Lung Institute, Imperial College London, Hammersmith Hospital, London, UK.
authors: M T A
authors: MT
authors: Sharabiani
authors: Cardiovascular Division, GKT School of Medicine, King's College Hospital, Denmark Hill, London, UK.
authors: O
authors: O
authors: Wendler
authors: Cardiothoracic Surgery, National Heart and Lung Institute, Imperial College London, Hammersmith Hospital, London, UK.
authors: G D
authors: GD
authors: Angelini
authors: Cardiovascular Division, GKT School of Medicine, King's College Hospital, Denmark Hill, London, UK.
authors: J
authors: J
authors: Desai
mesh_terms: D000109:Acetylcholine / Q000494:pharmacology; D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D062186:Arterial Pressure; D001026:Coronary Artery Bypass; D006801:Humans; D008297:Male; D008875:Middle Aged; D010656:Phenylephrine / Q000494:pharmacology; D055031:Primary Graft Dysfunction / Q000503:physiopathology*; D012501:Saphenous Vein / Q000503:physiopathology*; D014661:Vasoconstriction
chemical_list: D010656:Phenylephrine; D000109:Acetylcholine
keywords: CABG; endothelium; mean arterial blood pressure; saphenous vein; vasoconstriction