Abstract:

Introduction: the role of intracerebral stenosis of brain arteries in the development of postoperative strokes in patients with extensive atherosclerosis remains unresolved, and in clinical practice, magnetic resonance angiography (MRA) of cerebral arteries is not carried out routinely to predict the risk of postoperative cerebrovascular disorders.

Aim: was to identify factors of MRA of intracerebral arteries essential for prognosis of ischemic strokes in postoperative period of angiosurgical interventions and in acute period of myocardial infarction (AMI), from the quantitative processing of brain MRA recruited from the MRI — MRA register.

Materials and methods: results of brain MRA of 195 patients with extensive atherosclerosis carried out before cardio- or angiosurgical interventions were analyzed. Of these, three had an ischemic stroke after carotid endarterectomy, three — after CABG operations, and five — after surgical treatment of thoracic aortic aneurysms, on 2-5 day after surgery. We also studied results of brain MRA in five patients who developed an episode of ischemic brain stroke in the acute period of acute myocardial infarction. In all cases of circulatory disorders were localized in the region of middle cerebral artery (MCA). Everyone was given a time-of-flight MRA with reconstruction of three-dimensional anatomical picture of cerebral arteries. The index of gradient of narrowing of arterial lumen (GNL) of artery was calculated as the ratio of the difference in the area of artery at stenosis and at nearest proximal non-stenosed level, to the distance between them, along the course of the vessel: GNL={(Snorm–Sstenosis)/Dnorm–stenosis}, mm²/mm.

Results: analyzing the visual picture of brain MRA in patients, the sign of critical narrowing of MCA for >50% was observed in all five patients with acute ischemic stroke concomitant with acute myocardial infarction. In all 11 patients who developed postoperative stroke, the visual picture of MCA stenosis was bilateral, more pronounced on the side of the ischemic disorder after the operation. When using the GNL index, it was obvious that ischemic stroke developed only when the stenosis was more sharp than GSP >1,05 mm²/mm. Of five patients who showed signs of MCA stenosis but did not have postoperative stroke, four took doses of 250 mg/day or more of ethylmethylhydroxypyridine succinate (mexidol) for more than a month at the outpatient stage. The sensitivity of MRA preoperative sign of MCA stenosis in relation to postoperative ischemic stroke was 100% in all groups, the specificity and diagnostic accuracy was 97,5%, the predictability of a positive conclusion was 62,5-75%, and the predictability of a negative conclusion was 97-99%.

Conclusion: technology for evaluating the gradient of narrowing of arterial lumen in the area of atherosclerotic stenosis of intracerebral arteries in patients with extensive atherosclerosis allows predicting the risk of postoperative stroke. Gradient of narrowing of arterial lumen index for atherosclerotic middle cerebral artery over 1,05 mm²/mm in patients with extensive atherosclerosis predicts increased risk of strokes in postoperative period, or as a complication of acute myocardial infarction. Long-term preoperative injection of mexidol probably reduces the risk of postoperative stroke in extensive atherosclerosis.

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Abstract:

Aim: was to elucidate factors of poor prognosis for chronic brain ischemia in «asymptomatic» patients with atherosclerotic stenosis of vertebral arteries, who regularly take optimal medical therapy.

Methods: in 1st group (n = 44), secondary prevention of cerebrovascular accidents was carried out in a combined strategy - stenting of vertebral arteries in combination with medication therapy, and in 2nd group (n = 56) - only medication therapy. Long-term follow-up was planned after 12, 24 and 36 months. Inclusion criteria: «asymptomatic» patients with stenosis of vertebral arteries 50-95%; diameter of vertebral arteries is not less than 3.0 and not more than 5 mm; presence of cerebral and focal symptoms corresponding to the initial (asymptomatic) stage of chronic brain ischemia (according to E.V. Schmidt). Primary endpoint: total frequency of cardiovascular complications (death, transient ischemic attack or stroke, myocardial infarction).

Results: the total frequency of major cerebral complications over 36 months of follow-up was 4.5% in group 1 and 37.5% in group II (? ²=15.101; p<0.0001). The frequency of cardiac events was 9.1 and 19.6%, respectively, to 1st and 2nd groups (? ²=14.784; p<0.0001). These indicators were obtained against the background of high patient adherence to treatment and high rates of achieving tough target lipid values. Restenosis of stents was observed in general, in 38.67% of patients from group I. Moreover, restenosis alone did not affect the incidence of major cerebral complications in the long-term period (? ²=0.1643; p=0.735). Most significant poor prognosis factors of chronic brain ischemia in «asymptomatic» patients with vertebral artery stenosis, who regularly take optimal medical therapy are: arrhythmia, total cholesterol more than 6.0 mmol/l, incomplete circle of Willis, arterial hypertension, bilateral defeat of vertebral arteries, (low-density lipoprotein) LDL levels of more than 3.5 mmol/I, combined lesion of vertebral and carotid arteries, calcification of vertebral arteries, coronary heart disease in anamnesis.

Conclusion: endovascular intervention in combination with medical therapy could help to avoid the development of major brain complications arising from the instability of atherosclerotic plaque in «asymptomatic» patients with vertebral artery stenosis, and in the presence of poor prognosis factors identified can be regarded as a method of secondary prevention of cerebral circulatory disorders.

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Abstract:

Background: pulmonary hypertension not only aggravates the course of myocardial infarction, but also significantly worsens the prognosis, increasing disability and mortality due to the steadily progressing course. The need to predict the development of pulmonary hypertension in patients with myocardial infarction is not in doubt, since a clear clinical picture manifests itself only in the late stages of the disease, when the effectiveness of the treatment reduces and its cost increases.

Aim: was to define most significant factors, influencing the development of pulmonary hypertension in the subacute period of myocardial infarction to elaborate a model for predicting this pathological condition.

Material and methods: study included 451 men aged 18-60 y.o. with a verified diagnosis of myocardial infarction. All patients underwent a standard diagnostic algorithm, including a comprehensive echocardiographic examination - in first 48 hours and at the end of the third week of the disease. The study group included 84 patients with pulmonary hypertension, which had occurred at the end of the third week of the disease at an initially normal level of mean pressure in the pulmonary artery. Control group consisted of 367 patients with a normal level of mean pulmonary artery pressure in both phases of the study or normalization of this indicator at the end of the subacute period of the disease. Using multivariate analysis of variance from the analytical base, we selected parameters associated with levels of mean pulmonary artery pressure, the proportion of patients with first­time pulmonary hypertension at the end of the subacute Ml. Then, with step-by-step and binary logistic regressions, most sensitive of them were selected for the prognostic model.

Results: study established a number of significant for the development of pulmonary hypertension in the subacute period of myocardial infarction clinical and anamnestic (heart rate, diastolic blood pressure, the presence of pulmonary edema and chronic lung diseases), laboratory (concentrations of the sodium, potassium, chloride; glucose, some parameters of lipid concentration in the blood plasma) and instrumental (the value of left atrium, end-diastolic size of the right ventricle, values of indices of end-systolic and end-diastolic left ventricular volumes, cardiac index, total pulmonary resistance, the presence of regurgitation at the aortic valve) parameters. Final prognostic model included mean pulmonary artery pressure, heart rate and the presence of aortic valve regurgitation of the second degree and higher in first 48 hours of myocardial infarction. Characteristics of the resulting model allow us to recommend it for practical use.

Conclusions: using a combination of these predictors, as well as prognostic modeling, makes it possible to distinguish among men under 60 years, a high-risk group for the development of pulmonary hypertension in the subacute period of the disease in order to conduct timely additional diagnostic and therapeutic measures.

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Abstract:

An important clinical challenge the management of patients with pulmonary embolism is to determine prognosis of the treatment generally, and thrombolytic reperfusion therapy as the main component of a specific pathogenetic treatment in particular. This knowledge is necessary to adjust the plan of remedial measures, the intensification of concomitant pharmacotherapy and provide a personalized approach to patients with thromboembolic lesions of the pulmonary circulation

Aim: was to identify reliable predictors of the onset of reperfusion in patients with pulmonary thromboembolism based on methods of radiographic diagnosis.

Materials and Methods: 138 patients (73 women and 65 men) underwent examination. Age of patients ranged from 20 to 80 years (mean age 55±25 years). The first group includes observation of 102 patients admitted to hospital in early stages of disease ( 1 month after onset of symptoms). The second group consisted of 36 patients admitted to the hospital at a later date (from 1.5 to 12 months). In groups we studied predictors of pulmonary reperfusion channel on the basis of direct angiography and multislice computed tomography As a control, a diagnostic method used direct angiography, which has a high sensitivity and specificity in identifying symptoms of pulmonary embolism. Using the method of multiple logistic regression odds ratios were prepared to achieve reperfusion in patients with certain diagnostic symptoms compared with patients who have no signs data in angiography

Results: diagnostic criteria, in presence of which on angio-pulmonography significantly increased the likelihood of reperfusion are «amputation» of segmental branches of the pulmonary artery ( p<0.05, 16,55(6,50-42,09 ) ), intraluminal defects of contrast staining (p < 0.05, 30.56 (8,66-107,84)) and the absence of distal blood flow (p<0,05; 6,16(2,47-15,40)). Signs, significantly reducing chances of achieving reperfusion are tortuosity of segmental branches of the pulmonary artery (p<0,05; 0,03(0,01-0,08)), slowing of contrast branches of the pulmonary artery (p<0,05; 0,11( 0.05-0.25)), and the presence of defects in the near-wall staining (p<0,05; 73,182 (9,606-557,542)).

Conclusions: basing on results of modern beam-diagnostics may reliably predict the likelihood of reperfusion in patients with pulmonary embolism.

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