| Abbreviations | Meaning |
 | FHH | Familial Hypocalciuric Hypercalcemia; Fawn-hooded Hypertensive [rat]; Fetal Heart Heard |
| RCHF | Right Congestive Heart Failure |
| H&L | Heart And Lung [machine] |
| STAT-CHF | Survival Trial Of Antiarrhythmic Therapy In Congestive Heart Failure |
| PMHR | Predicted Maximum Heart Rate |
| NHLBI | National Heart, Lung And Blood Institute |
| IF | Hyperpolarization-activated Current [heart Electrical Activity] |
| CHD | Coronary Heart Disease |
| LRL | Lower [heart] Rate Limit |
| BHF | Bolivian Hemorrhagic Fever; British Heart Foundation |
| COMMIT | Community Intervention Trial [for Smoking Cessation]; Comprehensive Multidisciplinary Interventional Trial [for Regression Of Coronary Heart Disease] |
| HRV | Heart Rate Variability; Human Reovirus; Human Rhinovirus; Human Rotavirus |
| HRMAX | Maximal Heart Rate |
| MHR | Maximal Heart Rate |
| CLH | Cleft Limb-heart (syndrome) |
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