| Abbreviations | Meaning |
 | IAH | Idiopathic Adrenal Hyperplasia; Implantable Artificial Heart |
| VHD | Ventricular Heart Disease |
| HHT | Head Halter Traction; Hereditary Hemorrhagic Telangiectasia; Heterotopic Heart Transplantation; Homoharringtonine; Hydroxyheptadecatrienoic Acid |
| IHR | Intrinsic Heart Rate |
| BHR | Basal Heart Rate; Benign Hypertrophic Prostatitis; Borderline Hypertensive Rat; Bronchial Hyperreactivity |
| MH | Medtronic Hall (heart Valves) |
| NHBCD | Non-heart-beating Cadaver Donor |
| HRSUB | Submaximal Heart Rate |
| L/H | Lung-to-heart [ratio] |
| AHMA | American Holistic Medicine Association; Antiheart Muscle Autoantibody |
| MHR | Major Histocompatibility Region; Malignant Hyperthermia Resistance; Maternal Heart Rate; Maximal Heart Rate; Methemoglobin Reductase |
| LH | Left Heart |
| RPP | Heart Rate-systolic Blood Pressure Product; Rate-pressure Produce; Retropubic Prostatectomy |
| WHAS | Women's Health And Aging Study; Women's Heart Attack Study |
| DIAMOND-CHF | Danish Investigation Of Arrhythmia And Mortality On Dofetilide In Congestive Heart Failure |
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