Human urotensin II in internal mammary and radial arteries of patients undergoing coronary surgery.

Aims: Internal mammary (IMA) and radial artery (RA) have different incidence of vasospasm and long-term patency rates in arterial grafting. We compared the vasoreactivity of human urotensin II (hU-II) and its receptor with mechanism investigations in IMA and RA.

Methods: IMA and RA taken from patients undergoing coronary bypass surgery were studied in organ baths.