| Abbreviations | Meaning |
 | HM | Heart Murmur |
| HLT | Heart-lung Transplantation; High-L-leucine Transport; Human Lipotropin; Human Lymphocyte Transformation |
| NHS-1 | First Natural History Study [of Congenital Heart Defects] |
| HPLH | Hypoplastic Left Heart |
| REACH | Research On Endothelin Antagonism In Chronic Heart Failure; Resource Utilization In Congestive Heart Failure [studies] |
| BASH | Body Acceleration Synchronous With Heart Rate |
| BHF | Bolivian Hemorrhagic Fever; British Heart Foundation |
| M-HART | Montreal Heart Attack Readjustment Trial |
| HTX | Heart Transplantation |
| HD | Heart Disease |
| FHS | Framingham Heart Study |
| EHV | Edge Hill Virus; Electric Heart Vector; Epidermal Hyperplasia Virus; Equid Herpesvirus |
| IKR | Rectified Potassium Current [heart Electrophysiology] |
| RHRV | Relative Heart Rate Variability |
| ELVD-CHF | Exercise In Left Ventricular Dysfunction And Chronic Heart Failure [trial] |
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