| Abbreviations | Meaning |
 | HM | Heart Murmur |
| HT | Height Of Heart; Heterozygote; Hyperopia, Total; Hypothalamus |
| AE | Antitoxic Unit [Ger. Antitoxineinheit]; Apoenzyme; Aryepiglottic; Atherosclerotic Encephalopathy; Atrial Ectopic [heart Beat]; Avian Encephalomyelitis |
| BHI | Biosynthetic Human Insulin; Brain-heart Infusion [broth]; British Humanities Index; Bureau Of Health Insurance |
| HRRI | Heart Rate Retardation Index |
| HWI | Heart Work Index |
| COMMIT | Community Intervention Trial [for Smoking Cessation]; Comprehensive Multidisciplinary Interventional Trial [for Regression Of Coronary Heart Disease] |
| ISHT | International Society For Heart Transplantation [registry] |
| XISHF | Xamoterol In Severe Heart Failure [study] |
| HT | Heart; Heart Tones; Height; High Tension |
| CCHS | Congenital Central Hypoventilation Syndrome; Copenhagen City Heart Study |
| SP | Slow Pathway [heart Electrical Activity] |
| HBP | Heartbeat Period; Hepatic Binding Protein; High Blood Pressure; Hospital-based Practice |
| OPTIME | Outcomes Of A Prospective Trial Of Intravenous Milrinone For Exacerbations [of Chronic Heart Failure] |
| ICHD | Inter-Society Commission For Heart Disease Resources |
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