| Abbreviations | Meaning |
 | HWD | Heartworm Disease |
| VAL-HEFT | Valsartan-Heart Failure Trial |
| UHR | Underlying Heart Rhythm |
| ICHD | Inter-Society Commission For Heart Disease Resources |
| MHHS | Minnesota Heart Health Survey |
| I(TO) | Transient Outward Current [heart Electrical Activity] |
| FHNH | Fetal Heart Not Heard |
| FHS | Fetal Heart Sounds |
| HLM | Heart-lung Machine |
| HPS | [Simvastatin] Heart Protection Study |
| HE | Heart |
| NHLBI-PTCA | National Heart, Lung And Blood Institute Percutaneous Transluminal Coronary Angioplasty [registry] |
| BHAT | Beta Blocker Heart Attack Trial |
| WHT | Walsh-Hadamard Transform; Warm Heart Trial |
| IHDPORT | Ischemic Heart Disease Patient Outcomes Research Team |
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