T he 28-year-old male, who has been followed up with the diagnosis of hypertrophic cardiomyopathy (HCMP) since the age of 18, presented to the emergency department with complaints of Intracardiac Defibrillator (ICD) shock, increasing dyspnea, and weakness for the last weeks.He was hospitalized and optimal medical therapy with iv diuretic treatment started for compensation.According to his medical history; the patient had undergone ICD implantation 2 years ago due to Hypertrophic Cardiomyopathy (HCMP) and a history of sudden cardiac death in his family.Transthoracic echocardiography revealed reduced ejection fraction (30%), thickening of the interventricular septum (16 mm), and posterior wall (14 mm) with right ventricular dysfunction.After biventricular heart failure and hypertrophy displayed by echocardiography, it was decided that the patient should be catheterized first and discussed in the cardiac transplant