| Abbreviations | Meaning |
 | I(TO) | Transient Outward Current [heart Electrical Activity] |
| FHH | Familial Hypocalciuric Hypercalcemia; Fawn-hooded Hypertensive [rat]; Fetal Heart Heard |
| NHLBI | National Heart, Lung And Blood Institute |
| CLH | Cleft Limb-heart (syndrome) |
| LRL | Lower [heart] Rate Limit |
| EHVT | Edinburgh Heart Valve Trial |
| WHAT | Worcester Heart Attack Trial |
| BHS | Brisighella Heart Study |
| HERS | Heart And Estrogen-Progestin Replacement Study |
| NHS-1 | First Natural History Study [of Congenital Heart Defects] |
| HRF | Heart Rate Fluctuations |
| HHS | Honolulu Heart Study |
| PHHP | Pawtucket Heart Health Program |
| OPTIME CHF | Outcomes Of A Prospective Trial Of Intravenous Milrinone For Exacerbations Of Chronic HeartFailure |
| DHFS | Diet-Heart Feasibility Study |
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