| Abbreviations | Meaning |
 | HEROICS | How Effective Are Revascularization Options In Cardiogenic Shock? [trial] |
| HFECG | High Frequency Electrocardiography |
| HHCS | High-altitude Hypertrophic Cardiomyopathy Syndrome |
| HI-CPR | High-impulse Cardiopulmonary Resuscitation |
| HIC-CPR | High-impulse Compression Cardiopulmonary Resuscitation |
| HOC | Human Ovarian Cancer; Hydroxycorticoid; Hypertrophic Obstructive Cardiomyopathy |
| HOCAP | Hypertrophic Obstructive Cardiomyopathy Ablation Pacing [study] |
| HOCM | Hypertrophic Obstructive Cardiomyopathy |
| HOCM | High-osmolar Contrast Medium; Hypertrophic Obstructive Cardiomyopathy |
| HOMC | Hypertrophic Obstructive Cardiomyopathy |
| HRE | Hepatic Reticuloendothelial [cell]; High-resolution Electrocardiography; Hormone Receptor Enzyme; Hormone Response Element |
| HTCVD | Hypertensive Cardiovascular Disease |
| IAC CPR | Interposed Abdominal Compression Cardiopulmonary Resuscitation |
| IACD | Implantable Automatic Cardioverter-defibrillator; Intra-arterial Conduction Defect |
| IC | Impedance Cardiogram |
| ICARIS | Intervention Cardiology Risk Stratification [study] |
| ICC | Interventional Cardiac Center |
| ICCM | Idiopathic Congestive Cardiomyopathy |
| ICD | Implantable-cardioverter Defibrillator |
| ICD | Impedance Cardiogram |
| ICD | Implantable Cardioverter-defibrillator |
| ICD | Initial Cardioverter-defibrillator |
| ICD | Intracardiac Defibrillator |
| ICDC | Implantable Cardioverter-defibrillator Catheter |
| ICDS | Integrated Child Development Scheme; International Cardiac Doppler Society |
| ICE | Intracardiac Echocardiography |
| ICECG | Intracardiac Electrocardiography |
| ICF | International Cardiology Foundation |
| ICG | Impedance Cardiogram; Impedance Cardiography; Indocyanine Green; Isotope Cisternography |
| ICI | Intracardiac Infection |
| ICIN | Intracoronary Streptokinase Trial Of The Interuniversity Cardiology Institute Of The Netherlands |
| ICM | Intelligent Cardiovascular Monitor |
| ICM | Isolated Cardiovascular Malformation |
| ICO | Idiopathic Cyclic Oedema; Impedance Cardiac Output; Infection Control Officer |
| ICR | Intracardiac Catheter Recording |
| ICT | Intracardiac Thrombus |
| ICVS | International Cardiovascular Society |
| IDC | Idiopathic Dilated Cardiomyopathy; Infiltrating Ductal Carcinoma; Interdigitating Cell |
| IDCS | Idiopathic Dilated Cardiomyopathy Study |
| IECG | Intracardiac Electrocardiography |
| IEGM | Intracardiac Electrogram |
| IMAC | Intervention In Myocarditis And Acute Cardiomyopathy [study] |
| IMEP | Investigation In Menopausal Women Of The Effect Of Estradiol And Progesterone On Cardiovascular Risk Factors |
| IMPROVED | Influence Of Introduction Of Mycophenolate Mofetil And Reduction Of Cyclosporine On Renal Dysfunction After Cardiac Transplantation [study] |
| INSPIRE | Increasing Participation In Cardiac Rehabilitation; Intravascular Ultrasound Study Predictor Of Restenosis [trial] |
| IOE | Intraoperative Echocardiography |
| ISC | International Society Of Cardiology |
| ISCVS | International Society For Cardiovascular Surgery |
| ISFC | International Society And Federation Of Cardiology |
| J | A Reference Point Following The QRS Complex, At The Beginning Of The ST Segment, In Electrocardiography |
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