| Abbreviations | Meaning |
 | RHRV | Relative Heart Rate Variability |
| CHIME | Coloboma, Heart Anomaly, Ichthyosis, Mental Retardation, Ear Abnormality |
| HLT | Heart-lung Transplantation; High-L-leucine Transport; Human Lipotropin; Human Lymphocyte Transformation |
| ASHD | Arteriosclerotic Heart Disease |
| OHD | Hydroxylase Deficiency; Hydroxyvitamin D; Office Of Human Development; Ondine-Hirschsprung Disease; Organic Heart Disease |
| HAPORT | Heart Attack Patient Outcome Research Team [study] |
| HEFT | Heart Failure Trial |
| UKHEART | United Kingdom Heart Failure Evaluation And Assessment Of Risk Trial |
| COMMIT | Community Intervention Trial [for Smoking Cessation]; Comprehensive Multidisciplinary Interventional Trial [for Regression Of Coronary Heart Disease] |
| RT | [heart] Repolarization Time |
| AHA | Anti-heart Antibody; Antihistone Antibody; Area Health Authority; Arthritis-hives-angioedema [syndrome]; Aspartyl-hydroxamic Acid; Autoimmune Hemolytic Anemia |
| NHLBI | National Heart, Lung And Blood Institute |
| PMHR | Predicted Maximum Heart Rate |
| CHS | Charleston Heart Study |
| GWTG | Get With The Guidelines [American Heart Association] |
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