| Abbreviations | Meaning |
 | THB | Tetrahydrobiopterin; Thrombocyte B; Todd-Hewitt Broth; Total Heart Beats |
| HHD | High Heparin Dose; Home Hemodialysis [telemedicine]; Hypertensive Heart Disease |
| IKADO | Outward Inwardly Rectifying Potassium Current [heart Electrophysiology] |
| IN-CHF | Italian Network Congestive Heart Failure |
| HT | Heart |
| HELP | Heart European Leaders Panel [study] |
| CHIME | Coloboma, Heart Anomaly, Ichthyosis, Mental Retardation, Ear Abnormality |
| SYMPHONY | Sibrafiban Vs Aspirin To Yield Maximum Protection From Ischemic Heart Events Postacute Coronary Syndromes [trial] |
| HEFT | Heart Failure Trial |
| HASHD | Hypertensive Arteriosclerotic Heart Disease |
| IHD | Ischemic Heart Disease |
| FHS | Fetal Heart Sounds |
| THR | Targeted Heart Rate; Threonine; Thyroid Hormone Receptor; Total Hip Replacement; Transhepatic Resistance |
| RHD | Radiological Health Data; Relative Hepatic Dullness; Renal Hypertensive Disease; Rheumatic Heart Disease |
| VSHD | Ventricular Septal Heart Defect |
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