| Abbreviations | Meaning |
 | SDHD | Sudden Death Heart Disease |
| NYHA | New York Heart Association |
| CCHS | Congenital Central Hypoventilation Syndrome; Copenhagen City Heart Study |
| HRRR | Heart Regular Rate And Rhythm |
| PLET | Polymyxin, Lysosome, EDTA, Thallous Acetate [in Heart Infusion Agar] |
| ACHD | Atherosclerotic Coronary Heart Disease |
| PRIME | Prospective Randomized Study Of Ibopamine On Mortality And Efficacy In Heart Failure |
| FHS | Framingham Heart Study |
| HAPORT | Heart Attack Patient Outcome Research Team [study] |
| ISHLT | The International Society For Heart And Lung Transplantation |
| FHF | Fetal Heart Frequency; Fulminant Hepatic Failure |
| HRR | Hardy-Rand-Rittler [color Vision Test]; Head Rotation To The Right; Heart Rate Range |
| CHS | Congenital Heart Surgeons Society [study] |
| SYMPHONY | Sibrafiban Vs Aspirin To Yield Maximum Protection From Ischemic Heart Events Postacute Coronary Syndromes [trial] |
| HPLH | Hypoplastic Left Heart |
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