Effects of nitric oxide in septic shock

Nitric oxide (NO) is believed to play a key role in the pathogenesis of sep tic shock, although many aspects of NO's involvement remain poorly defined. Recent years have seen advances in our understanding of the production and effects of NO, but much of the work has been done in animal models and may not be directly relevant to the clinical situation. Differences between sp ecies and models can account for many of the apparently conflicting results obtained. Nevertheless, NO-directed strategies have been developed and tes ted clinically. However, NO can have both beneficial and detrimental effect s on many organ systems in sepsis and attempts to nonselectively block all its actions may therefore not yield positive results on outcome. Further ex ploration and precision of the role of NO and development of techniques to assess the NO balance in individual patients is necessary before further pr ogress can be made in this field.