Myocardial interstitial noradrenaline monitoring during occlusion of inferior vena cava in cats

Acta Physiologica Scandinavica
H KitagawaT Yamazaki

Abstract

To investigate myocardial interstitial noradrenaline (NA) kinetics during activation of systemic sympathetic nerves, we applied a dialysis technique to the left ventricle of anaesthetised cats and monitored myocardial interstitial NA levels during 6-min occlusion of the inferior vena cava (IVC). Dialysis probes were implanted in the left ventricular wall, and dialysate NA levels as an index of myocardial interstitial NA levels, were measured with high-performance liquid chromatographic-electrochemical detection. During IVC occlusion, dialysate NA levels progressively increased from 110 +/- 17 pmol L-1 in the control and reached 620 +/- 160 pmol L-1 at 4-6 min of IVC occlusion. Local administration of omega-conotoxin GVIA at 10 microM decreased the control dialysate NA level to 35 +/- 0.2 pmol L-1. The IVC occlusion induced increase in dialysate NA was suppressed only at 0-2 min of IVC occlusion. Intravenous injection of omega-conotoxin GVIA (10 micrograms kg-1) did not increase the dialysate NA levels during IVC occlusion. Local administration of desipramine at 100 microM increased the control dialysate NA level to 900 +/- 73 pmol L-1. The IVC occlusion induced progressive increase in dialysate NA was augmented at 2-6 min of IV...Continue Reading

References

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Citations

Dec 13, 2001·Neurochemistry International·Hirotoshi KitagawaToji Yamazaki
Nov 13, 2002·Neurochemistry International·Hirotoshi KitagawaKenji Sunagawa
Oct 19, 1999·Neurochemistry International·T YamazakiT Kawada
Apr 19, 2008·Acta Anaesthesiologica Scandinavica·H KitagawaH Mori

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