| Abbreviations | Meaning |
 | HRRI | Heart Rate Retardation Index |
| HRA | Heart-reactive Antibody |
| XISHF | Xamoterol In Severe Heart Failure [study] |
| FHR | Fetal Heart Rate |
| LHS | Left Heart Strain |
| HMO | Health Maintenance Organization; Heart Minute Output |
| ASHD | Arteriosclerotic Heart Disease |
| HRSUB | Submaximal Heart Rate |
| TAH | Total Abdominal Hysterectomy; Total Artificial Heart |
| FHS | Family Heart Study |
| RHRV | Relative Heart Rate Variability |
| CLH | Chronic Lobular Hepatitis; Cleft Limb-heart [syndrome]; Corpus Luteum Hormone; Cutaneous Lymphoid Hyperplasia |
| INA | Sodium Current [heart Electrical Activity] |
| WATCH | Warfarin Antiplatelet Trial In Chronic Heart Failure; Worcester-area Trial For Counseling In Hyperlipidemia |
| HCA | Heart Cell Aggregate |
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