| Abbreviations | Meaning |
 | HM | Heart Murmur |
| CNTHM | Conotruncal Heart Malformation |
| HT | Height Of Heart; Heterozygote; Hyperopia, Total; Hypothalamus |
| IK(AC, ADOI) | Acetylcholine And Adeno-sensitive Potassium Current [heart Electrophysiology] |
| HLK | Heart, Liver, Kidney |
| LRL | Lower [heart] Rate Limit |
| HLR | Heart-lung Resuscitation; Heart-to-lung Ratio; High-level Resistance |
| RHB | Regional Hospital Board [UK]; Right Heart Bypass |
| HC | Heart Catheterization |
| CESNA II | Comparative Efficacy And Safety Of Nisoldipine And Amlodipine [in Hypertension With Ischemic Heart Disease] |
| BHIS | Beef Heart Infusion Supplemented [broth] |
| STAT-CHF | Survival Trial Of Antiarrhythmic Therapy In Congestive Heart Failure |
| CHFDT | Congestive Heart Failure Data Tool |
| SP | Slow Pathway [heart Electrical Activity] |
| NHLBI | National Heart, Lung And Blood Institute |
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