| Abbreviations | Meaning |
 | HLR | Heart-lung Resuscitation; Heart-to-lung Ratio; High-level Resistance |
| APPROACH | Alberta Provincial Project For Outcomes Assessment In Coronary Heart Disease |
| H | Heart |
| MHR | Major Histocompatibility Region; Malignant Hyperthermia Resistance; Maternal Heart Rate; Maximal Heart Rate; Methemoglobin Reductase |
| SP | Slow Pathway [heart Electrical Activity] |
| HRF | Heart Rate Fluctuations |
| BHS | Brisighella Heart Study |
| LRL | Lower [heart] Rate Limit |
| FHT | Fast Hartley Transform; Fetal Heart; Fetal Heart Tone |
| PLET | Polymyxin, Lysosome, EDTA, Thallous Acetate [in Heart Infusion Agar] |
| HAL | Heart Attacks In London [study] |
| OHS | Open Heart Surgery |
| AHF SCENE | Advanced Heart Failure Shared Clinical Experience Network |
| IHD | Ischemic Heart Disease |
| CHS | Charleston Heart Study |
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