Abstract
Objective
The principal effects of prostaglandin I2 are vasodilation and inhibition of platelet aggregation induced by a rise in the intracellular second messenger cAMP. In the heart a rise in intracellular myocardial cAMP increases contractility. We examined whether prostaglandin I2 increases left ventricular contractility in vivo. The effects of epoprostenol and iloprost on left ventricular contractility were assessed in vivo and compared to the effects of adenosine and sodium nitroprusside, which exerts vasodilatory properties independently of cAMP.
Design and setting
Prospective, randomized, cross-over in a university laboratory.
Subjects
Eleven pigs (25.9±2.8 kg, balanced anesthesia).
Interventions
Each animal was exposed to intravenous sodium nitroprusside, adenosine, and epoprostenol in randomized order. Iloprost was administered at the end due to its longer half-life. The dose was titrated to achieve a 25% reduction in diastolic aortic pressure.
Measurements and results
Left ventricular contractility was assessed before, during, and after each intervention by determination of the endsystolic elastance with the conductance method. While there was no change in endsystolic elastance upon the infusion of adenosine and sodium nitroprusside; endsystolic elastance increased in the case of epoprostenol (57%) and iloprost (71%) .
Conclusions
Left ventricular contractility is increased in vivo by epoprostenol and iloprost but not by adenosine or sodium nitroprusside at equipotent hypotensive dose. A contribution of sympathetic reflex activation of cardiac nerves on the increase in left ventricular contractility cannot be completely ruled out.
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Acknowledgements
The excellent advice and research terms as provided by Prof. Dr. med. Dr. h.c. mult. Konrad Meßmer are greatly acknowledged. We thank Alke Schropp for valuable contributions on sample processing, Brigitte Blount (nationally certificated keeper) and her team for professional animal care. To Dr. Maag, Institute for Medical Information Processing, Biometry and Epidemiology, and Dr. Peters, Institute for Surgical Research, we are highly indebted for designing the statistical procedure. The work was performed at the Institute for Surgical Research, Ludwig Maximilian University, Klinikum Großhadern Munich, Germany.
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The study was supported by a research grant (Reg-No. 79 FöFoLe), Medical Faculty of the Ludwig Maximilian University of Munich.
An editorial regarding this article can be found in the same issue (http://dx.doi.org/10.1007/s00134-003-1834-8)
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Kisch-Wedel, H., Kemming, G., Meisner, F. et al. The prostaglandins epoprostenol and iloprost increase left ventricular contractility in vivo. Intensive Care Med 29, 1574–1583 (2003). https://doi.org/10.1007/s00134-003-1891-z
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DOI: https://doi.org/10.1007/s00134-003-1891-z