| Abbreviations | Meaning |
 | IHHS | Idiopathic Hyperkinetic Heart Syndrome |
| INA | Sodium Current [heart Electrical Activity] |
| HMO | Health Maintenance Organization; Heart Minute Output |
| LH | Left Heart |
| IK(ATP), IK-ATP | ATP-sensitive Potassium Current [heart Electrical Activity] |
| FHH | Familial Hypocalciuric Hypercalcemia; Fawn-hooded Hypertensive [rat]; Fetal Heart Heard |
| NHLBI | National Heart, Lung And Blood Institute |
| CHF-IES | Congestive Heart Failure-Italian Epidemiological Study |
| IN-CHF | Italian Network Congestive Heart Failure |
| NHS-2 | Second Natural History Study [of Congenital Heart Defects] |
| RHRV | Relative Heart Rate Variability |
| HLM | Heart-lung Machine |
| TEAHAT | Thrombolysis Early In Acute Heart Attack Trial |
| BHF | Bolivian Hemorrhagic Fever; British Heart Foundation |
| FP | Fast Pathway [heart Electrical Activity] |
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