Abstract:

Aim: was to investigate possibilities of multislice computed tomography in estimation of stenosis degree in coronary arteries in patients with ischemic heart disease (IHD).

Materials and methods: we examined 64 patients (18 female, 46 male, mean age 62,4± 9,5 years), who primary had been admitted to hospital and had high risk of IHD; and those who had early diagnosed IHD of 1,2,3 and 4 functional class, they were hospitalized for condition correction. Mainly spreaded risk factor was arterial hypertention in 55 patients - (85,9%) with highest level 200/100 mm hg and minimal 140/80 mm hg. All patients underwent multislice computed tomography (MSCT) on the 256-slice tomography station «Somatom definition flash (Siemens, Germany)»: collimation 128 x 0,6, the temporal resolution of 75 ms and a spatial resolution of 0.33 mm, slice thickness of 0.6 mm, with simultaneous use of two tubes with different voltage (kV 120/100), the current mAs - with programs to reduce radiation exposure Care Dose - is calculated automatically according to the constitution of man.

Post-processing of obtained data was performed on a workstation Syngo Via, in the application of CT-Soronary with automatic longitudinal separation of each coronary artery In view of image quality was analyzed data from end-diastolic phase of the cardiac cycle (80% R-R), or evaluated complex of multiphase images. We analyze the state of the main arteries of the main coronary: left anterior descending artery, the circumflex artery and the right coronary artery (LAD, CA, RCA). We performed estimation of coronary artery stenosis of segments according to the American Heart Association (AHA). Results were displayed in percentage. Obtained data was compared with those obtained using the reference method - X-ray coronary angiography, which was performed according to standard protocol

Results: comparison of results of coronary angiography and MSCT using correlation analysis showed the presence of strong direct significant correlation coefficients in the evaluation of coronary artery disease according to two methods. It was demonstrated a high inter-operator and intraoperator reproducibility of MSCT in the study of vessels conditions. Following characteristics of the method related to the identification of coronary artery stenosis segments: sensitivity - 95.8%, specificity - 92.8%, diagnostic accuracy - 95.1%, positive predictive value - 97.9%, negative predictive value - 86.6 %.

It was concluded that the high importance of the method of MSCT in the diagnosis of cardiovascular diseases and the need for its widespread use in cardiology practice.  

References 

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Abstract:

Aim: was to improve the efficiency of diagnosis of patients with coronary heart disease, by estimating of possibilities of cardiac multislice computed tomography in comparison with coronary angiography.

Materials and methods: study included 64 patients (18 women and 46 men, mean age 62,4 ± 9,5 years) with a high risk of developing coronary heart disease. In 34 patients - myocardial infarction in anamnesis (18 patients - in pool right coronary artery in 16 patients - in left anterior descending artery). Clinics of angina pectoris - in 40 patients (functional class (FC) I - 10; FC II - 22, FC III - in 6, FC IV - 2 patients). Selection criteria: the absence of disease progression for at least 6 weeks, and at least 3 months of optimal treatment. All patients underwent cardiac MSCT at 256-slice CT scanner. Obtained data was compared with data of reference method - x-ray coronary angiography.

Results: comparison of MSCT coronary angiography with invasive data showed a high comparability of results of two methods in the evaluation of coronary artery disease. It was revealed that discrepancies between cardiac MSCT and CAG in detection of hemodynamically insignificant stenoses ranging from 0 to 4%, hemodynamically significant stenoses - from 0 to 2.6%, subtotal stenosis - from 0 to 1%, occlusions - 0%. The presence of strong correlations between data of cardiac MSCT and coronary angiography of stenosis, demonstrated the high quality of MSCT imaging of coronary artery segments in the examination with a variety of modes of application method.

Conclusion: multislice computed tomography is a highly effective method for diagnosing of structural and anatomic changes of coronary arteries in patients with coronary heart disease.

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