Background:The cardiovascular disease especially coronary artery disease is the leading cause of mortality in worldwide. There is lack of research study which evaluated stenosis of coronary atherosclerosis. It is known that coronary stenosis is highly connected to the levels of biomarkers. Coronary atherosclerosis correlated with endothelin receptor type A (EDNRA) levels in a group of patients suspected of having coronary artery disease.Objective:The goal of this study was to evaluate the relation between the coronary atherosclerosis and levels of EDNRAMethods:A total of 311 participants were involved in this study. A case-control study was used in the study. The baselines data were collected from the department of Angiography at the National Third Central Hospital and National lilood Transfusion and Research center. We have determined the degree of coronary atherosclerosis using the Angiography machine and Elisa were used for detecting the blood endothelin levels in all groups.Results:98 participants were diagnosed with stenosis and occlusion. The blood endothelin levels were estimated to 6.32±0.64 pg/ml which refer to () degree of coronary stenosis, the first degree of stenosis of coronary atherosclerosis is estimated to 5.56±0.22pg/ml, the second degree of stenosis of coronary atherosclerosis is estimated to 5.42J0.34 pg/ml, the third degree of stenosis of coronary atherosclerosis is estimated to 5.87 H). 13 pg/ml, the fourth degree of stenosis of coronary atherosclerosis is I'SlilllSltll lo 5.69±0.09 pg/ml, it was estimated to 5.88±0.13 pg/ml in control groups. Level of EDNRA (occupying one segment of coronary artery) was estimated to 5.77±0.08 pg/ml. two segment involvement was estimated to 5.72±0.16 pg/ml, three segment involvement 5.73±0.19 pg/ml. four segments involvement 5.50±0.25 pg/ml, respectively.Conclusion:The blood endothelin level and coronary artery stenosis were not correlated statistically significant in control group of the study. However, blood endothelin levels were increased in patients who tend to experience the coronary artery stenosis.

Introduction: Khuumii (throat singing) is a unique form of art derived from the nomadic population of Central Asia, producing two or more “simultaneous” sounds and melodies through the organ of speech. Material and Methods: The aim of the study is to identify the anatomical structures involved in the formation of khuumii and the features and patterns of their functions and compare each type of khuumii as performed by Mongolian people. A total of 60 participants aged 18-60 years (54 men and 6 women) were selected by non-random sampling method using cross-sectional study. Statistical analysis was performed using SPSS 23 software using questionnaires, X-ray, endoscopy, sound research method, and general blood tests. Results: 90.7% of the khuumii singers were male and 9.3% were female. The average height of the participants was 172.91±0.93 cm (arithmetic mean and mean error), average body weight was 77.53±2.46 kg, and body mass index was 25.93±5.31 respectively. Heart rate was 92.19±20.71 per minute prior to khuumii while 133.19±19.09 after performing khuumii and 85.81-98.56 at 95% confidence interval. In terms of ethnicity (ethnographically), the Khalkh were the largest ethnic group (72.1%), followed by Bayad, Buryatia, Darkhad, Torguud, and Oirat (2.3%), respectively. 60.5% of the participants were professional khuumii singers who graduated from relevant universities and colleges. The process of Khuumii was recorded by X-ray examination, and laryngeal endoscopy evaluated the movement of true and false vocal chords, interstitial volume, movements of epiglottis and arytenoid cartilage, and mucosa. Khuumii increases the workload of the cardiovascular system by 70-80%. Furthermore, the sound frequency is 2-4 times higher than that of normal speech, and sound volume is 0.5-1 times higher. 95.3% of throat singers did not have a sore throat, 88.4% did not experience heavy breathing, and 74.1% had no hoarseness. During the formation of khuumii sound, thoracic cavity, diaphragm, and lungs regulate the intensity of the air reaching the vocal folds, exert pressure on the airways and vibrate the sound waves through air flows passing through the larynx and vocal folds. Mouth-nose cavity as well as pharynx are responsible for echoing the sound. Conclusion It is appropriate to divide khuumii into two main types according to structural and functional changes in the organs involved; shakhaa and kharkhiraa. Khuumii, the “Human music” originating from the people of Altai Khangai basin by imitating the sounds of nature with their own voice in ancient times, spread all over the world from Mongolia and it is proposed to classify khuumii into two main types of shakhaa and kharkhiraa in terms of structural involvement and functionality.