| 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 |