| Abbreviations | Meaning |
 | EIHDW | Evaluation Of Ischemic Heart Disease In Women [study] |
| HE | Heart |
| IF | Hyperpolarization-activated Current [heart Electrical Activity] |
| MRC/BHF | Medical Research Council, British Heart Foundation Heart Protection Study |
| HLT | Heart-lung Transplantation; High-L-leucine Transport; Human Lipotropin; Human Lymphocyte Transformation |
| HLR | Heart-lung Resuscitation; Heart-to-lung Ratio; High-level Resistance |
| HEFT | Heart Failure Trial |
| HLTX | Heart-lung Transplant |
| HLM | Heart-lung Machine |
| H-L-K | Heart, Liver, And Kidneys |
| HLHS | Hypoplastic Left Heart Syndrome |
| CM | CarboMedics (heart Valves) |
| FHT | Fetal Heart Tones |
| HMO | Health Maintenance Organization; Heart Minute Output |
| HM | Heart Murmur |
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