Related Experiment Video
Updated: Aug 14, 2026
Ultrasound Based Assessment of Coronary Artery Flow and Coronary Flow Reserve Using the Pressure Overload Model in Mice
Published on: April 13, 2015
[Determination of coronary-myocardial reserve by stress echocardiography in patients with programmed pacemaker]
Aim:
To study coronary-myocardial reserve in patients with a programmed pacemaker.
Materials And 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.
Conclusion:
As a highly informative and reproducible method, stress echocardiography can be employed for optimization of antianginal therapy in CHD patients with a pacemaker.
Related Concept Videos
01:26Exercise Stress Test
Exercise stress testing, commonly known as a treadmill test, is a noninvasive procedure used to evaluate cardiovascular function and diagnose heart conditions.
Definition
An exercise stress test measures the heart's response to exertion using a treadmill or stationary bicycle. Chest electrodes record the heart's electrical activity through an ECG, and blood pressure is monitored regularly.
Purposes
01:30Acute Coronary Syndrome III: Diagnostic Studies