[Effects of recombinant human brain natriuretic peptide and milrinone on cardiac hemodynamics and renal function in anesthetized dog].
OBJECTIVE
To study the effects of rhBNP and milrinone on the cardiac hemodynamics and renal function in anesthetized dogs.


METHODS
The actions of rhBNP given cumulatively i.v. 10, 30 and 100 ng.kg-1 for 30 min and milrinone of single dose (100 micrograms.kg-1, i.v.) on cardiac hemodynamics and renal function were studied in anesthetized open-chest dogs.


RESULTS
In anesthetized dogs (n = 7) intravenous infusion of rhBNP at 10-100 ng.kg-1, caused decreases in mean arterial pressure (MAP), left ventricular systolic pressure (LVSP), LVdp/dtmax, pulmonary arterial pressure (PAP), left ventricular end diastolic pressure (LVEDP), total peripheral resistance (TPR) and renal vascular resistance (RVR) dose-dependently, without significant changes in cardiac output (CO), LV(dp/dt)/P, renal blood flow (RBF) and heart rate (HR), increases in urinary volume and sodium excretion. In anesthetized dogs (n = 6), there were remarkable decreases in MAP, LVEDP, PAP, TPR, RBF, RVR and urinary volume following the MIL (100 micrograms.kg-1, i.v.), with significant increases of LVSP, +/- LVdp/dtmax, HR and CO, but no marked changes in urinary volume and sodium excretion.


CONCLUSIONS
rhBNP reduces the pre-load and after-load in the anaesthetized dogs but showed no distinct effect on the contractility of the heart. Positive inotropic and chronotropic actions have been demonstrated after intravenous injection of milrinone 100 micrograms.kg-1 in anesthetized dogs.
Xu
Xiang-wei
XW
Tianjin Institute of Pharmaceutical Research, Tianjin 300193, China.
Yang
Wei
W
Zhao
Zhuan-you
ZY
Liu
Hou-xiao
HX
Zeng
Gui-yun
GY
D000758:Anesthesia; D000818:Animals; D002316:Cardiotonic Agents / Q000494:pharmacology; D004285:Dogs; D004347:Drug Interactions; D005260:Female; D006321:Heart / Q000187:drug effects* / Q000502:physiology; D006439:Hemodynamics; D007668:Kidney / Q000187:drug effects* / Q000502:physiology; D008297:Male; D020105:Milrinone / Q000494:pharmacology*; D020097:Natriuretic Peptide, Brain / Q000494:pharmacology*; D011994:Recombinant Proteins / Q000494:pharmacology; D012964:Sodium / Q000097:blood / Q000652:urine; D014556:Urine
D002316:Cardiotonic Agents; D011994:Recombinant Proteins; D020097:Natriuretic Peptide, Brain; D012964:Sodium; D020105:Milrinone