| Abbreviations | Meaning |
 | HFR | Heart Frequency; High Frequency |
| FHR | Fetal Heart Rate |
| CCHD | Caephilly Collaborative Heart Disease [study]; Cyanotic Congenital Heart Disease |
| HCA | Heart Cell Aggregate |
| CEHC | Calf Embryonic Heart Cell; Cost-effective Healthcare |
| OHT | Ocular Hypertension; Orthotopic Heart Transplantation; Oslo Heart Trial |
| BASH | Body Acceleration Synchronous With Heart Rate |
| AHA | Anti-heart Antibody; Antihistone Antibody; Area Health Authority; Arthritis-hives-angioedema [syndrome]; Aspartyl-hydroxamic Acid; Autoimmune Hemolytic Anemia |
| NHBCD | Non-heart-beating Cadaver Donor |
| HWD | Heartworm Disease |
| CLH | Chronic Lobular Hepatitis; Cleft Limb-heart [syndrome]; Corpus Luteum Hormone; Cutaneous Lymphoid Hyperplasia |
| HWBW | Heart Weight To Body Weight [ratio] |
| CHIME | Coloboma, Heart Anomaly, Ichthyosis, Mental Retardation, Ear Abnormality |
| VDH | Valvular Disease Of The Heart |
| OH | Open Heart [surgery] |
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