| Abbreviations | Meaning |
 | HERS | Heart And Estrogen-Progestin Replacement Study |
| HLT | Heart-lung Transplantation; High-L-leucine Transport; Human Lipotropin; Human Lymphocyte Transformation |
| MACH | Machine Activity [UMLS]; Mortality Assessment In Congestive Heart Failure [study] |
| IHR | International Health Regulations; Intrahepatic Resistance; Intrinsic Heart Rate |
| CASHD | Coronary Arteriosclerotic Heart Disease |
| UKHAS | United Kingdom Heart Attack Study |
| S1-S4 | First To Fourth Heart Sounds |
| HCA | Heart Cell Aggregate |
| SCD-HEFT | Sudden Cardiac Death In Heart Failure: Trial Of Prophylactic Amiodarone Vs Implantable Defibrillator Therapy |
| HLR | Heart-lung Resuscitation; Heart-to-lung Ratio; High-level Resistance |
| IN-CHF | Italian Network Congestive Heart Failure |
| FHF | Fetal Heart Frequency; Fulminant Hepatic Failure |
| SPWVD | Smooth Pseudo-Winger-Ville Distribution [heart Rate Signal] |
| AHD | Atherosclerotic Heart Disease |
| AVHD | Acquired Valvular Heart Disease |
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