Myocardium selective densitometric perfusion assessment after acute myocardial infarction

Relationship between early myocardial reperfusion assessed by videodensitometry and late left ventricular function. Results following invasive treatment of acute myocardial infarction

Introduction: It is known that there is a relationship between myocardial perfusion and left ventricular function. Aim: The aim of the current study was to examine the relationship between myocardial reperfusion as assessed by videodensitometry on coronary angiograms following invasive treatment of ST elevation myocardial infarction and magnetic resonance imaging-derived late left ventricular function. Method: The study included 25 patients with ST elevation myocardial infarction. A quantitative parameter of myocardial (re)perfusion was calculated by the ratio of maximal density (Gmax) and the time to reach maximum density (Tmax) following invasive treatment. Magnetic resonance imaging was performed 387±262 days after ST elevation myocardial infarction for the evaluation of left ventricular function in all cases. Results: Significant correlations were demonstrated between left ventricular ejection fraction and Gmax(r = 0.40, p = 0.05) and Gmax/Tmax(r = 0.41, p = 0.04) following vessel masking. Conclusions: The results demonstrate significant relationship between densitometric Gmax/Tmaxand late left ventricular function following ST elevation myocardial infarction. Orv. Hetil., 2014. 155(5), 187–193.

Videodensitometric time-density curve change after alcohol septal ablation of obstructive hypertrophic cardiomyopathy

A recently developed computerized method for estimation of myocardial perfusion, based on the analysis of the time-density curves, is demonstrated to assess myocardial blush over a selected myocardial region of interest in a patient with obstructive hypertrophic cardiomyopathy before and after alcohol septal ablation.

Aortic valve stenosis is associated with reduced myocardial perfusion as assessed by videodensitometry in coronary angiograms

Aortic valve stenosis may be accompanied by angina despite coronary arteries free of significant stenosis due to microvascular abnormalities. Aims: The aim of the current study was to test whether densitometry-derived myocardial perfusion on coronary angiogram is reduced in patients with aortic valve stenosis. Methods: The study comprised 20 patients with aortic valve stenosis (mean transvalvular gradient: 47.4±15.2 mm Hg) and 30 control subjects without significant epicardial coronary artery stenosis. A quantitative parameter of myocardial perfusion was calculated by the ratio of maximal density (Gmax) and time to reach maximum density (Tmax) on time–density curves in regions of interest of each coronary artery on coronary angiograms. Results: Mean three-vessel Gmax/Tmax proved to be significantly lower in patients with aortic valve stenosis compared to control subjects (2.55±1.02 1/sec vs. 3.39±1.09 1/sec, p<0.01). Conclusions: Reduced Gmax/Tmax values indicative of myocardial perfusion abnormalities as measured by densitometry on coronary angiograms could be demonstrated in patients with aortic valve stenosis compared to controls. Orv. Hetil., 2012, 153, 1256–1262.