Abstract:

Introduction: for assessment of the significance of coronary artery stenosis, it is necessary to determine the minimum area of the residual square of the vessel lumen (VLRS) that can provide adequate blood flow to myocardial needs. This value is called «threshold» or «borderline». Numerous studies on this issue using modern intravascular and isotope techniques, randomized clinical trials have shown that the values of the «borderline» value of VLRS for proximal coronary arteries are within 3-4 mml. According to the literature, the angiographic method for assessing the severity of stenosis is not sufficiently informative and unreliable. In this article, a combination of coronary angiography with use of balloon catheter is proposed, that allows to eliminate disadvantages of the angiographic method in solving the task is shown.

Aim: was to investigate possibilities of the method of determining the VLRS of coronary artery (CA) in the stenosis region and to assess its hemodynamic significance based on coronary angiography (CG) using a balloon catheter

Materials and methods: the essence of the proposed approach is the obstruction of the artery at the site of stenosis with a balloon catheter with a known cross-sectional area; the VLRS value in this case is equal to or smaller than the area of the balloon catheter. In case of obstruction of the artery by balloon catheter with a transverse area up to 4 mm2, stenosis was considered to be hemodynamically significant and revascularization was recommended; with preserved intensive blood flow, stenosis is considered hemodynamically insignificant.

Results: angiogram evaluation was performed in 120 patients with IHD with «intermediate» stenoses of proximal coronary arteries (from 40 to 70%) using the described technique. In 84% of cases, VLRS was estimated at 3,14 mm2 or less; in 8% of the VLRL was 3,86 mm2 or less. In such areas of coronary arteries, stenosis was considered hemodynamically significant. These patients underwent revascularization of the myocardium - balloon angioplasty and stenting of the coronary artery In 8% of cases, VLRS was more than 4 mm2, coronary stenosis in such cases was recognized as hemodynamically insignificant, and endovascular treatment was not performed in these patients.

Conclusion: the proposed approach for assessment of the area of the residual square of coronary artery lumen at the site of constriction provides an opportunity for an optimal choice of treatment tactics. 

References 

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Abstract:

The aim of the study was to evaluate results of percutaneous coronary interventions (PCI) in patients with ischemic cardiomyopathy (ICMP) - potential candidates for heart transplantation. The study included 37 patients with ICMP. All the patients before PCI and within the 7 days after it undergo ec-hocardiography and ECG-gated SPECT. The amount of irreversibly damaged myocardium of the left ventricle (LV) was about 50 % of its volume. In these patients ECG-gated SPECT did not show sufficient amount of the viable myocardium, capable to restore the heart function after revascularization. The main result of intervention was increase in survival rate of patients with ICMP within 4 years of observation in comparison with traditional methods of conservative therapy. The first clinical effect of PCI was disappearance or reduction of dyspnea, noted in the majority of the patients. These changes had been confirmed by improvement of a functional class of patients (NYHA class score increase to 3,2±0,5 from 1,7+65; p=0,007) and increase of tolerance to physical excersise. Positive changes of a clinical condition after PCI have taken place due to decrease in rigidity of LV myocardium: It became apparent due to decrease of LV end-diastolic pressure (35,7+9,3 vs. 23,5+9,9 Hg mm; p=0,04) and pressure in pulmonary artery (44+1 2 vs. 33+7 Hg mm; p=0,03). No changes of LV volumes and ejection fraction values in the given category of patients were seen.

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Abstract:

Lesions of the LCA stem are found in 2,5-4 % of patients with coronary heart disease who endured coronography, and are accompanied by more severe symptomatology, higher morbidity and mortality rates, and difficulty of radical correction. According to the generally accepted guidelines, the operation of coronary artery bypass has up to now been a method of choice in treatment of the LCA stem. Nevertheless, endovascular methods of treatment for LCA stem lesions have relatively long been used, while implementation into clinical practice of drug-eluding stents has considerably improved the remote outcomes, which made it possible to consider LCA stem stenting as a real alternative to ACB. Hence, the problem concerning indications for and contraindications to LCA stem stenting remains unsolved today. We retrospectively analysed a total of 75 endovascular interventions on the LCA stem in 67 patients, with an isolated lesion of the LCA stem being found only in 7,4 % of the patients. The remaining subjects had lesions of the LCA stem on the background of a multivascular lesion of the coronary bed, including occlusion of the RCA observed in 16,4 % of cases. Successive revascularization was performed in 98,64 % of cases, with no lethal outcomes. One patient required urgent ACB due to development of occluding dissection of the circumflex branch. Complications in the immediate postoperative period were observed in two patients and were represented by non-Q myocardial infarction and stroke. LCA stem stenting proved an efficient and safe method of treatment for coronary heart disease. A comparative analysis of the immediate results of LCA stem stenting and ACB revealed advantages of stenting, consisting in no lethal outcomes (in our series) and a lower short-term rate of postoperative complications.

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16.   Бокерия Л. А., Алекян Б. Г., Бузиашвили Ю. И. и др

Abstract:

Aim: was to assess dynamics of angiographic parameters of coronary artery rehabilitation, spasm throughout, below chronic coronary occlusion (CCO), after recanalization and balloon angioplasty, with survey of 8-10 weeks, basing on dynamics of anatomical and morphological characteristics of the artery with a major idea to optimize conditions for stenting.

Materials and methods: research analyzes results of two-stage treatment of 26 patients with CCO, complicated by a spasm, by which result after a recanalization of occlusion, was a contrasted artery with diameter less than 1 mm.

In these cases angioplasty with balloons with a diameter up to 3 mm doesn’t yield desirable results and diameter of an artery below a place of occlusion averaged 1,5 mm, and the difference of diameters of proximal and distally department averages 1,78 mm that is an adverse factor for stenting as is followed by high level of restenosis and thrombosis.

Results: within 4-8 weeks (on average 68 days) all arteries remained passable with equal contours, without angiographic signs of dissection, which took place right after balloon angioplasty Diameter of an artery increased with 1,5 mm to 2,64 mm; a difference of diameters of proximal and distally departments of an artery at the level of CCO decreased from 1,78 mm to 0,45 mm that was a favorable condition for stenting.

Conclusion: within 4-8 weeks after recanalization under normal pressure and blood flow occurs a readaptation of artery, expressed in a significant increase in the diameter of the artery below the CCO, which contributes to the optimization of stenting.

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Abstract:

Aim: was to estimate parameters of left ventricle (LV) perfusion and kinetics at ischemic chronic heart failure (CHF), which initial values are predictors of increased myocardial functional reserve and patients clinical status improvement as a result of revascularization.

Materials and methods: examined 157 patients (146 men and 11 women; age from 33 to 72 years) before and in 2 - 3 days after percutaneous coronary intervention with diagnosis: CAD, CHF with NYHA class III-IV echocardiography parameters of LV: ejection fraction less than 40%, end-diastolic volume is more than 200 ml. Perfusion and function disorders were estimated with use of ECG-gated single photon emission computed tomography (SPECT).

Results: in 48% of cases 6-minute walk test increased more than 150%; NYHA class decreased by 2 classes (group 1). In 52% cases 6-minute walk test increased less than 50% and the NYHA class decreased on 1 class or did not change (group 2). Comparison of initial LV condition and clinical effect revealed following conformities. The revascularization effect is limited not to extent of coronary blood flow recovery, but first of all a cardiac muscle condition, the quantitative relation of the functioning myocardium and a focal cardiosclerosis. Thus, critical size to define the favorable forecast of revascularization is perfusion disorder more than a half of LV and kinetics disorder more than a third of cardiac muscle volume. Prevalence of a cardiosclerosis over the functioning myocardium limits clinical effect of a revascularization and growth of a functional reserve.

Conclusion: degree of initial LV myocardium perfusion and movement disorders at patients with severe ischemic heart failure is the key indicator, influencing clinical efficiency of coronary intervention

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12.   Mandegar M.H., Yousefnia M.A., Roshanali F., Rayatzadeh H., Alaeddini F. Interaction between two predictors of functional outcome after revascularization in ischemic cardiomyopathy: left ventricular volume and amount of viable myocardium. J Thorac Cardiovasc Surg. 2008 Oct; 136(4):930-6.

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