Summary: systemic effects of inhaled nitric oxide.

Many effects of inhaled nitric oxide (NO) are not explained by the convention that NO activates pulmonary guanylate cyclase or is inactivated by ferrous deoxy- or oxyheme. Inhaled NO can affect blood flow to a variety of systemic vascular beds, particularly under conditions of ischemia/reperfusion. It affects leukocyte adhesion and rolling in the systemic periphery. Inhaled NO therapy can overcome the systemic effects of NO synthase inhibition. In many cases, these systemic-NO synthase-mimetic effects of inhaled NO seem to involve reactions of NO with circulating proteins followed by transport of NO equivalents from the lung to the systemic periphery. The NO transfer biology associated with inhaled NO therapy is rich with therapeutic possibilities. In this article, many of the whole-animal studies regarding the systemic effects of inhaled NO are reviewed in the context of this emerging understanding of the complexities of NO biochemistry.

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