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. 1993 Apr;108(4):933–940. doi: 10.1111/j.1476-5381.1993.tb13489.x

The effects of N omega-nitro-L-arginine methyl ester, sodium nitroprusside and noradrenaline on venous return in the anaesthetized cat.

E A Bower 1, A C Law 1
PMCID: PMC1908176  PMID: 8485632

Abstract

1. The vascular actions of N omega-nitro-L-arginine methyl ester (L-NAME), sodium nitroprusside and noradrenaline were investigated in cats under chloralose anaesthesia with controlled vascular tone and ventilation. Cardiac output, heart rate, vascular pressures and mean circulatory filling pressure (MCFP) were measured. Total peripheral resistance (TPR) and resistance to venous return (Rvr) were calculated from steady-state readings. 2. L-NAME (37 mumol kg-1, i.v.) administered to ten cats receiving noradrenaline (6 nmol kg-1 min-1, i.v.) increased aortic pressure by 47.5 +/- 7.1 mmHg from 106 mmHg, and MCFP by 1.56 +/- 0.36 mmHg from 10.0 mmHg (means +/- s.e. means). Mean changes in portal venous pressure, RAP and heart rate were not significant. Cardiac output fell by 29.7 +/- 3.3% from 130 ml min-1 kg-1. TPR rose by 108 +/- 7.2% from 796 mmHg l-1 min kg and Rvr by 58.4 +/- 4.5% from 64 mmHg l-1 min kg. 3. Infusion of sodium nitroprusside into cats receiving noradrenaline evoked dose-related falls in aortic pressure, MCFP, TPR and Rvr. Changes in portal venous pressure, RAP and heart rate were not significant and cardiac output fell slightly. After L-NAME, sensitivity to nitroprusside was increased by 139 +/- 34% for MCFP, 176 +/- 19% for TPR and 351 +/- 39% for Rvr, and cardiac output rose slightly. The nitroprusside infusion required to restore TPR after L-NAME was estimated to be 5.8 x 10(+/- 0.41) nmol kg-1 min-1, which was approximately three times more than that required to restore MCFP.(ABSTRACT TRUNCATED AT 250 WORDS)

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Selected References

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