Pretreatment with α-adrenergic blockers for prevention of radial artery spasm

Background. Radial artery (RA) conduits are prone to early vasospasm. Current intraoperative treatment with papaverine fails to inhibit postoperative RA constriction. Pretreatment with topical α-antagonist solutions can inhibit RA vasoconstriction and cause dilatation for a longer period than achieved with papaverine. Methods. In 10 patients undergoing myocardial revascularization, the radial artery was harvested as a skeletonized vessel. A composite graft with reverse free RA on an in situ left internal thoracic artery was prepared before construction of distal coronary anastomoses. The RA pedicle was then put in a small syringe filled with Regitine (phentolamine methansulphonic, 0.07 mg/mL) ("Jacuzzi") and warmed by immersing the container in a warm saline bath for 8 to 15 minutes. The RA free flow was measured before and after topical treatment with Regitine. Results. The mean number of grafts per patient was 2.9 (range 2 to 4). The mean number of radial anastomoses was 1.8 per patient. Left internal thoracic artery free flow was 110 ± 29 mL/min. Regitine increased radial free flow from 49 ± 35 to 77 ± 30 mL/min (p < 0.01). Five patients underwent postoperative coronary angiography. All radial anastomoses were patent. Conclusions. Topical treatment of RA with Regitine increases RA free flow and is an effective intraoperative means of decreasing RA spasticity.