© 1996 American Heart Association, Inc.
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Chronic Inhalation of Nitric Oxide Inhibits Neointimal Formation After Balloon-Induced Arterial Injury
From the Cardiovascular Research Center and Cardiac Unit of the General Medical Service and Department of Anaesthesia at Massachusetts General Hospital and Harvard Medical School, Boston, Mass.
Correspondence to Kenneth D. Bloch, MD, Cardiovascular Research Center, CNY-4, Massachusetts General Hospital, 149 13th St, Charlestown, MA 02129. E-mail blochk@helix.mgh.harvard.edu.
Abstract Systemic and local intravascular NO administration inhibits neointimal formation after vascular injury in animal models. NO appears to attenuate smooth muscle proliferation both directly and indirectly by preventing the release of growth factors. Inhalation of low concentrations of NO dilates pulmonary vascular smooth muscle but does not cause systemic vasodilatation. Recently, NO inhalation was found to inhibit platelet function in vivo. We studied the effects of NO inhalation on neointimal formation after balloon-induced injury of the adult rat carotid artery. Beginning 60 minutes before carotid injury, rats breathed either air with 0 or 80 ppm NO for 14 days. Rats were killed, carotid arteries were fixed and paraffin-embedded, and neointimal formation was measured by analyzing the ratio of intimal to medial areas (I/M ratio) in carotid artery cross sections. Intimal hyperplasia was evident in both groups of animals, but I/M ratios were 43% less in animals breathing 80 ppm NO for 2 weeks than in animals breathing air alone (0.78±0.12 and 1.37±0.11 [mean±SE], respectively; P<.02). Similarly, 1 week after carotid injury, neointimal formation was less in rats breathing 80 ppm NO than in rats breathing air alone (I/M ratio, 0.39±0.11 versus 0.76±0.06; P<.02). Breathing 20 ppm NO for 2 weeks or 80 ppm NO for 1 week followed by air alone for 1 week did not attenuate neointimal formation measured at 14 days. In anesthetized rats breathing 80 ppm NO or air alone for 1 hour, neither systemic blood pressure nor bleeding time differed. These observations demonstrate that inhaling 80 ppm NO inhibits neointimal formation after balloon-induced carotid artery injury in rats. NO inhalation may represent a safe and novel method of preventing restenosis after percutaneous angioplasty.
Key Words: nitric oxide • neointimal formation • angioplasty • inhalation therapy
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