Microdialysis-evaluated myocardial cyclooxygenase-mediated inflammation and early circulatory depression in porcine endotoxemia.

Abstract:

OBJECTIVE:To evaluate the early myocardial biochemical inflammatory response with the microdialysis technique during porcine endotoxemia and to simultaneously monitor systemic hemodynamics. DESIGN:Prospective, randomized, placebo-controlled trial with parallel groups. SETTING:Animal research laboratory at the University Hospital of Uppsala, Sweden. SUBJECTS:Thirteen piglets aged 12-14 wks receiving general anesthesia. INTERVENTIONS:After thoracotomy and the insertion of microdialysis probes in standardized locations in the left ventricle of the heart and in the quadriceps muscle, seven pigs received a continuous infusion of endotoxin, initiating a severe endotoxemic shock. Six pigs received saline instead of endotoxin. MEASUREMENTS AND MAIN RESULTS:Endotoxemia caused a rapid and pronounced elevation of a metabolite obtained from prostaglandin degradation, 15-keto-dihydro-PGF(2alpha), in myocardial microdialysate fluid being specific of cyclooxygenase (COX)-mediated inflammation (p <.001 vs. saline-infused controls). Simultaneously, we observed a decrease in left ventricular stroke work index in the endotoxemic pigs (p <.01 vs. saline-infused controls). Endotoxemia did not alter 15-keto-dihydro-PGF(2alpha) levels in quadriceps muscle. Endotoxemia caused increases in taurine, hypoxanthine, and magnesium in myocardial microdialysate (p <.05 vs. saline-infused controls), whereas the contents of pyruvate, lactate, inosine, adenosine, and calcium were not significantly changed. CONCLUSION:Endotoxemia induced a myocardial COX-mediated inflammation without signs of ischemia. In parallel, a depletion of myocardial energy substrates and a deterioration in myocardial performance were seen.

journal_name

Crit Care Med

journal_title

Critical care medicine

authors

Mutschler DK,Eriksson MB,Wikström BG,Lind L,Larsson A,Bergren-Kiiski R,Lagrange A,Nordgren A,Basu S

doi

10.1097/01.CCM.0000075740.61294.a6

subject

Has Abstract

pub_date

2003-06-01 00:00:00

pages

1780-5

issue

6

eissn

0090-3493

issn

1530-0293

journal_volume

31

pub_type

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