Invited opinion: role of nitric oxide in hemorrhagic, traumatic, and anaphylactic shock and thermal injury.

Csaba Szabo, C. Thiemermann

Research output: Contribution to journalArticle

182 Citations (Scopus)

Abstract

The free radical nitric oxide (NO) is synthesized from the guanidino group of L-arginine by a family of enzymes termed NO synthase (NOS). Hemorrhagic shock leads to an inhibition of NO production by the calcium-dependent, endothelial NOS (ecNOS), which may lead to maldistribution of blood flow leading to, e.g., coronary, renal, and cerebral ischemia and may enhance the adhesion of neutrophil granulocytes and platelets to the endothelial surface. Prolonged periods of hemorrhagic shock are associated with the induction of a calcium-independent isoform of NOS in a variety of organs and in the vascular smooth muscle. The formation of large quantities of NO by inducible isoform of NOS (iNOS) contributes to the delayed vascular decompensation and to the hyporeactivity of the vasculature to vasoconstrictor agents. An impairment of NO formation by the ecNOS has been demonstrated in various models of traumatic shock, whereas there is good experimental evidence supporting the hypothesis that an enhanced formation of NO contributes to the pathophysiology of experimental thermal injury and anaphylactic shock. We speculate that a pharmacological modulation of NO biosynthesis which either enhances NO concentration in the vicinity of endothelium (i.e., NO donors) or inhibits NO overproduction following iNOS expression (i.e., iNOS-selective NOS inhibitors) may become novel therapies to improve the outcome of patients with circulatory shock of various etiologies.

Original languageEnglish (US)
Pages (from-to)145-155
Number of pages11
JournalShock (Augusta, Ga.)
Volume2
Issue number2
StatePublished - Aug 1994
Externally publishedYes

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Traumatic Shock
Hemorrhagic Shock
Anaphylaxis
Nitric Oxide
Hot Temperature
Nitric Oxide Synthase
Wounds and Injuries
Protein Isoforms
Calcium
Nitric Oxide Donors
Vasoconstrictor Agents
Brain Ischemia
Vascular Smooth Muscle
Granulocytes
Free Radicals
Endothelium
Blood Vessels
Arginine
Shock
Neutrophils

ASJC Scopus subject areas

  • Physiology
  • Critical Care and Intensive Care Medicine

Cite this

Invited opinion : role of nitric oxide in hemorrhagic, traumatic, and anaphylactic shock and thermal injury. / Szabo, Csaba; Thiemermann, C.

In: Shock (Augusta, Ga.), Vol. 2, No. 2, 08.1994, p. 145-155.

Research output: Contribution to journalArticle

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