| Abbreviations | Meaning |
 | IF | Hyperpolarization-activated Current [heart Electrical Activity] |
| NHF | National Heart Foundation [Australia] |
| HRR | Hardy-Rand-Rittler [color Vision Test]; Head Rotation To The Right; Heart Rate Range |
| HLT | Heart-lung Transplantation; High-L-leucine Transport; Human Lipotropin; Human Lymphocyte Transformation |
| MH | Medtronic Hall (heart Valves) |
| REMATCH | Randomized Evaluation Of Mechanical Assistance In The Treatment Of Congestive Heart Failure [study] |
| WHT | Walsh-Hadamard Transform; Warm Heart Trial |
| IHDI | Ischemic Heart Disease Index |
| DRFS | Dundee Rank Factor Score [risk Factors In Coronary Heart Disease] |
| IB | Background Sodium Current [heart Electrical Activity] |
| IK | Potassium Current [heart Electrophysiology] |
| OH | Open Heart [surgery] |
| TCI | To Come In [open Heart Surgery Program At Cleveland Clinic] |
| LHT | Left Hypertropia; Lifestyle Heart Trial |
| HRA | Heart Rate Audiometry |
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