| Abbreviations | Meaning |
 | HL | Heart And Lungs |
| RHC | Right Heart Catheterization |
| PICO | Pimobendan In Congestive Heart Failure [study]; Population, Intervention, Comparison And Outcome |
| IK | Potassium Current [heart Electrophysiology] |
| NDHS | National Diet-Heart Study |
| HI | Heart Infusion |
| NHLBI II | National Heart, Lung And Blood Institute Type II [coronary Intervention Study] |
| BCHT | Bicaval Heart Transplantation |
| HHD | High Heparin Dose; Home Hemodialysis [telemedicine]; Hypertensive Heart Disease |
| HE | Heart |
| AHMD | Alcoholic Heart Muscle Disease |
| HEHR | Highest Equivalent Heart Rate |
| AHMA | Antiheart Muscle Autoantibody |
| HRT | Heart Rate; Heidelberg Retinal Tomography; Hormone Replacement Therapy; Hormone Replacement Trial |
| RHD | Rheumatic Heart Disease |
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