| Abbreviations | Meaning |
 | SP | Slow Pathway [heart Electrical Activity] |
| ESCAPE | Evaluation Study Of Congestive Heart Failure And Pulmonary Artery Catheterization Effectiveness |
| OPTIME CHF | Outcomes Of A Prospective Trial Of Intravenous Milrinone For Exacerbations Of Chronic HeartFailure |
| DHFS | Diet-Heart Feasibility Study |
| NHS-2 | Second Natural History Study [of Congenital Heart Defects] |
| MHV | Magnetic Heart Vector; Middle Hepatic Vein; Mouse Hepatitis Virus; Murine Hepatitis Virus |
| H1 | First [heart] Sound; Halistatin; Protium |
| APDB | [heart] Action Potential Duration-baseline Beat |
| IHR | International Health Regulations; Intrahepatic Resistance; Intrinsic Heart Rate |
| HRRI | Heart Rate Retardation Index |
| CHB | Chronic Hepatitis B; Complete Heart Block; Congenital Heart Block |
| LHS | Lung Heart Study |
| IK(ATP), IK-ATP | ATP-sensitive Potassium Current [heart Electrical Activity] |
| MHR | Major Histocompatibility Region; Malignant Hyperthermia Resistance; Maternal Heart Rate; Maximal Heart Rate; Methemoglobin Reductase |
| HBP | Heartbeat Period; Hepatic Binding Protein; High Blood Pressure; Hospital-based Practice |
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