| Abbreviations | Meaning |
 | CLA | Closed Loop Algorithm [for Infusion Of Catecholamine In Heart Stress Test] |
| MHHP | Minnesota Heart Health Program |
| ST/HR | ST Segment [ECG] Depression With Exercise Divided By Changes In Heart Rate |
| FHRNST | Fetal Heart Rate Nonstress Test |
| OHT | Ocular Hypertension; Orthotopic Heart Transplantation; Oslo Heart Trial |
| SDHD | Sudden Death Heart Disease |
| BHAT | Beta Blocker Heart Attack Trial |
| VHR | Ventricular Heart Rate |
| FHS | Family Heart Study |
| HRRI | Heart Rate Retardation Index |
| BHF | Bolivian Hemorrhagic Fever; British Heart Foundation |
| THR | Targeted Heart Rate; Threonine; Thyroid Hormone Receptor; Total Hip Replacement; Transhepatic Resistance |
| HHD | High Heparin Dose; Home Hemodialysis [telemedicine]; Hypertensive Heart Disease |
| HLR | Heart-lung Resuscitation; Heart-to-lung Ratio; High-level Resistance |
| WATCH | Warfarin Antiplatelet Trial In Chronic Heart Failure; Worcester-area Trial For Counseling In Hyperlipidemia |
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