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J Thorac Cardiovasc Surg 2000;120:313-318
© 2000 The American Association for Thoracic Surgery

Surgery for acquired cardiovascular disease

Functional integrity and aging of the left internal thoracic artery after coronary artery bypass surgery

Giovanni Amoroso, MDa, René A. Tio, MD, PhDa, Massimo A. Mariani, MD, PhDb, Adrianus J. van Boven, MD, PhDa, Gillian A. J. Jessurun, MD, PhDa, Stefan H. J. Monnink, MD, PhDa, Jan G. Grandjean, MD, PhDb, Piet W. Boonstra, MD, PhDb, Harry J. G. M. Crijns, MD, PhDa

From the Department of Cardiologya and Department of Cardiothoracic Surgery,b Thoraxcenter, University Hospital of Groningen, The Netherlands.

René A. Tio received financial support from The Netherlands Heart Foundation, grant D95-019.

Address for reprints: Giovanni Amoroso, MD, Thoraxcentrum, University Hospital Groningen, PO Box 30 001, 9700 RB Groningen, The Netherlands (E-mail: G.Amoroso{at}thorax.azg.nl ).

Objective: To study the endothelial function in the left internal thoracic artery after coronary artery bypass surgery and to identify predictors of early dysfunction, we performed a provocative test with acetylcholine in 23 male patients who underwent routine postoperative coronary angiography.
Methods: The change in mean diameter of the proximal thoracic artery was assessed by quantitative angiography after selective injections of acetylcholine and nitroglycerin.
Results: The thoracic artery showed a 6.8% (P < .001) and 9.0% (P < .001) increase in mean diameter after acetylcholine and nitroglycerin administration, respectively. Vasodilative responses to acetylcholine and nitroglycerin administration were strongly correlated (R: 0.88; P < .001). Among the common risk factors, only age was associated with an impairment in the vasodilative response of the arterial graft (P = .001), and acetylcholine-induced vasodilation was inversely correlated to the age of the patient (R: 0.69; P < .001).
Conclusions: Endothelium-dependent vasodilative response to acetylcholine administration seems well preserved in the left internal thoracic artery after surgery. Common risk factors, except for age, do not affect the functional integrity of the arterial graft. The vasodilative properties of the graft depend on the age of the patient and do not deteriorate over time after operation.




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