| Abbreviations | Meaning |
 | CTR | Cardiothoracic Ratio; Carpal Tunnel Release; Central Tumor Registry; Connecticut Tumor Registry |
| CRU | Cardiac Rehabilitation Unit; Clinical Research Unit |
| CRI | Cardiac Risk Index |
| SCAI | The Society For Cardiac Angiography And Interventions |
| CCU | Cardiac Care Unit |
| PCTI | Penetrating Cardiac Trauma Index |
| FEKG | Fetal Electrocardiogram |
| UCO | Ultrasonic Cardiac Output |
| CTRD | Cardiac Transplant Research Database |
| EKG | Electrocardiogram (also ECG) |
| LCSD | Left Cardiac Sympathetic Denervation |
| CIBIS | Cardiac Insufficiency Bisoprolol Study |
| VJC | Ventriculojugularcardiac |
| CCC | Canadian Cardiovascular Coalition [study] |
| ICM | Intelligent Cardiovascular Monitor |
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