[Acute effects of isosorbide mononitrate on blood circulation and myocardial ischemia in patients with coronary atherosclerosis].
OBJECTIVE
To evaluate the acute effects of isosorbide mononitrate on circulation, cardiac function and left ventricular segmental motility in patients with isquemic heart disease due to coronary artery disease.


METHODS
Twenty-four patients with ischemic heart disease, 10 women, with mean age of 58 years, were studied during cardiac catheterization, at baseline condition and 5min after intravenous infusion of 0.3mg/kg of isosorbide mononitrate.


RESULTS
After infusion of isosorbide mononitrate there were significant reduction in mean right atrial pressure no mean pulmonary artery pressure (< 0.0001), left ventricular and diastolic pressure (p < 0.004), left ventricular systolic pressure (p < 0.002), maximum (p < 0.002) and mean (p < 0.008) aortic pressure, and left ventricular systolic volume (p < 0.004), as well as significant increase in the left ventricular ejection fraction (p < 0.001) and mean velocity of circunferential fibers shortening (p < 0.001). There was no significant modification of minimum aortic pressure, heart rate, cardiac output nor of left ventricular and diastolic volume. With respect of segmental motility of the left ventricle after medication, 38 kypokinetic segments normalized their motility, 4 akinetic segments remained intact, and of the 21 dyskinetic segments, 6 normalized, 8 became hypokinetic and 7 remained dyskinetic.


CONCLUSIONS
Isosorbide mononitrate, when used as intravenous infusion, have a rapid and direct effect on systemic and pulmonary circulation, and improving segmental motility and left ventricular performance in patients with impaired left ventricular motility caused by ischemic heart disease.
Faculdade de Medicina da UFRGS--Porto Alegre, RS.
W C
WC
Manfroi
A J
AJ
Zago
J P
JP
Ribeiro
J C
JC
Raudales
L
L
Fanti
E M
EM
Brum
A
A
Perin
J
J
Oliveira
D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D006328:Cardiac Catheterization; D002932:Cineangiography; D003324:Coronary Artery Disease / Q000150:complications / Q000503:physiopathology*; D005260:Female; D006439:Hemodynamics / Q000187:drug effects*; D006801:Humans; D007275:Injections, Intravenous; D007548:Isosorbide Dinitrate / Q000031:analogs & derivatives* / Q000494:pharmacology; D008297:Male; D008875:Middle Aged; D017202:Myocardial Ischemia / Q000150:complications / Q000503:physiopathology*; D014665:Vasodilator Agents / Q000494:pharmacology*; D016277:Ventricular Function, Left / Q000187:drug effects
D014665:Vasodilator Agents; D007548:Isosorbide Dinitrate; C030397:isosorbide-5-mononitrate
Efeitos agudos do mononitrato de isosorbitol sobre a circulação e isquemia miocárdica em pacientes com aterosclerose coronária.