en Cardiology Cardiology case report case report <span style="font-size:14px;"><span style="font-family:Times New Roman;"><span style="color:#0000ff;"><strong><em>Background:</em></strong> </span>Common arterial trunk (CAT) is a rare congenital heart disease, and often leads to the early development of pulmonary hypertension and disability. Among the critical structural heart defects, the frequency of CAT is 3%, which reflects the severe hemodynamic disturbances. The natural course of the disease is characterized by a high mortality rate up to 88% during the first year of life. We introduce a patient with common arterial trunk disease.<br> <span style="color:#0000ff;"><strong><em>Case presentation:</em></strong></span> The article describes a case of a 9-year old boy with a diagnosis of type I common arterial trunk (CAT) that rejected recommendations of many physicians for many years. At 7 months, the baby was diagnosed as CHD and at 3 years, a cardiac catheterization was performed and the final diagnosis was common arterial trunk, type I with defect of interventricular septum and pulmonary hypertension. During, parents refused the operation. The health status of the last examination was bad due to high pulmonary hypertension and chronic arterial hypoxemia. Drug therapy continued with bosentan, sildenafil, captopril, kudesang, spironolactone and aspirin<br> <span style="color:#0000ff;"><strong><em>Conclusion:</em></strong> </span>The late detection of children with CAT or late surgery leads to the rapid progression of pulmonary hypertension and significantly reduces the patient&#39;s chances for performing surgical correction of the defect.</span></span> congenital structural heart disease, common arterial trunk, pulmonary hypertension, Serum serotonin 454 457 http://caspjim.com/browse.php?a_code=A-10-568-4&slc_lang=en&sid=1 Saule Kabiyeva kabieva60@mail.ru 100319475328460024974 100319475328460024974 No Karaganda Medical University, Karaganda, Kazakhstan Seyed Farzad Jalali Sfjalali42@yahoo.com 100319475328460024975 100319475328460024975 Yes Department of Cardiology, Babol University of Medical Sciences, Babol, Iran Farida Mindubayeva mindubayeva@gmu.kz 100319475328460024976 100319475328460024976 No Karaganda Medical University, Karaganda, Kazakhstan Gaukhar Igimbayeva igt_tgt@mail.ru 100319475328460024977 100319475328460024977 No Karaganda Medical University, Karaganda, Kazakhstan