| Abbreviations | Meaning |
 | NYHAFC | New York Heart Association Functional Class |
| HLK | Heart, Liver, Kidney |
| SHHS | Scottish Heart Health Study; Sleep Heart Health Study |
| LRL | Lower [heart] Rate Limit |
| AHES | Artificial Heart Energy System |
| RHR | Renal Hypertensive Rat; Resting Heart Rate |
| AHF | Acute Heart Failure |
| HDP | Heart Disease Program [computerized Diagnosis]; Hexose Diphosphate; High-density Polyethylene; Hydrogen Diphosphonate; Hydroxydimethylpyrimidine |
| MDHR | Maximum Determined Heart Rate |
| THD | Thomsen Disease; Transverse Heart Diameter |
| AVHD | Acquired Valvular Heart Disease |
| NHLI | National Heart And Lung Institute [NIH] |
| CHD | Cyanotic Heart Disease |
| HAPORT | Heart Attack Patient Outcome Research Team [study] |
| BFHR | Basal Fetal Heart Rate |
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