[Determination of coronary-myocardial reserve by stress echocardiography in patients with programmed pacemaker].
OBJECTIVE
To study coronary-myocardial reserve in patients with a programmed pacemaker.


METHODS
Stress-echocardiography was performed in 64 patients with coronary heart disease (CHD). The stress was induced by a gradual increase in the frequency of electrostimulation (ES) by 10 imp/min from initial 90 imp/min to threshold value which was defined as the frequency threshold of myocardial ischemia induction (FT).


RESULTS
Registration of defects in local left ventricular contractility and cardiodynamics in frequent heart ES identified patients with predominant coronary and myocardial failure. Low FT (100-110 imp/min) indicates poor coronary reserve while a considerable rise of the end diastolic pressure in the left ventricle indicates limited myocardial reserve. Positive results of the test in isolated ventricular ES were obtained in 90.9%, in atrial ES in 72.7% of patients.


CONCLUSIONS
As a highly informative and reproducible method, stress echocardiography can be employed for optimization of antianginal therapy in CHD patients with a pacemaker.
Iskenderov
B G
BG
Stepkin
V A
VA
D000328:Adult; D000368:Aged; D000787:Angina Pectoris / Q000150:complications / Q000000981:diagnostic imaging* / Q000503:physiopathology; D005117:Cardiac Complexes, Premature / Q000150:complications / Q000503:physiopathology / Q000628:therapy*; D003324:Coronary Artery Disease / Q000150:complications / Q000000981:diagnostic imaging* / Q000503:physiopathology; D003326:Coronary Circulation / Q000502:physiology; D004452:Echocardiography; D005080:Exercise Test / Q000379:methods; D005260:Female; D006339:Heart Rate; D006801:Humans; D008297:Male; D008875:Middle Aged; D009200:Myocardial Contraction / Q000502:physiology; D010138:Pacemaker, Artificial; D011379:Prognosis